cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2510172-1
title: Understanding high piezoelectricity in the lead-free relaxor ferroelectric BFBT

description: Lead free relaxor ferroelectrics are being developed to replace lead-based systems which are widely used commercially in capacitors, actuators and sensors. An important aspect of these materials is their piezoelectric behaviour which can be utilised in advanced electromechanical devices. Such relaxor ferroelectrics are characterised by local polar nano regions (PNRs) which show fast switching in electric fields. Classical average structure analysis cannot explain the observed piezo/ferroelectric behaviour of these materials and a more comprehensive analysis of both long-range and short-range structure is needed. It is proposed to carry out a detailed study of the local and long range structures of the lead-free relaxor ferroelectric (1-x)BiFeO3-xBaTiO3 (BFBT) using reverse Monte Carlo analysis of neutron total scattering data. At around x = 0.33, the system shows outstanding piezoelectric performance. This study aims at studying the evolution of PNRs in this system and their role in the enhanced piezoelectric behaviour. The study would represent the first of its kind on a lead-free ferroelectric.
DOI: 10.5286/isis.e.rb2510704-1
title: Tracking muons to their final states in model systems

description: We recently studied KF to investigate muon sites and diffusion pathways, owing to its simple structure and low cation nuclear moment. However, the data showed a very small asymmetry and strange relaxation that we were unable to explain. This result prompted us to consider muon behaviour more widely in the alkali halides, with previous studies suggesting a delayed diamagnetic state is formed through a prompt paramagnetic species. This early work proposed that state conversion is mediated by defect states. One of the crucial assumptions in μSR is that any defects that may be caused by the implantation of the muon are sufficiently far away that they do not affect the final muon spectra, but if the hypothesis from this early work is found to be correct then this could have profound implications for μSR. As alkali fluorides weren’t part of this early study and their measurements on the halides were carried out over a comparatively restricted temperature range, we believe that it’s opportune to take a fresh look at these materials. As well as at-resonance RF measurements to determine state conversion rates, we plan to use a combination of 90º pulsed RF methods and DFT to characterise the final states. The original study will be extended to encompass the alkali fluorides, where the F− ion so often plays a role in significantly modifying the muonic properties of these materials.
DOI: 10.34816/ifao.archives.232990
title: SAQQARA_nb_1994_06061

description: Référence : nb_1994_06061<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/kvb-zq5-3h8
title: Urtica urens L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/lwe-33m-rag
title: Trifolium repens L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510650
title: muSR study on highly frustrated triangular lattice compound Ba3YbRu2O9

description: The Ba3BRu2O9 (B=Transition-metal or Rare-earth) compounds have gained a lot of interest in recent years owing to the interesting observations of quantum spin liquid, orbital ordering, and complex magnetic ordering in these compounds. Here we propose to study one member of this family, Ba3YbRu2O9, a highly frustrated compound with a frustration index of ~50, by performing ZF- and LF-muSR experiments at the EMU spectrometer. The dc magnetization study on the compound reveals a magnetic transition at ~4.3 K. Interestingly, the specific heat data infers a broad anomaly centered at ~7.5 K suggesting short-range correlation in the paramagnetic state, along with a sharp anomaly at ~ 4.3 K. The deviation of the paramagnetic susceptibility from the Curie-Weiss behavior below ~100 K, a temperature much higher than the transition temperature of TN~4.3 K, also suggests the presence of short-range magnetic correlations in the paramagnetic state of the compound. The proposed ZF-muSR experiments will shed light on the short-range magnetic correlations in the compound, while LF-muSR scans will be helpful to get an estimate of the internal magnetic field to decouple the muon spins. Longitudinal field (LF) scans will help in understanding the role of any inhomogeneities/disorder in muon relaxation, if present, as reported for other Ba3YRu2O9 and Ba3InRu2O9 isostructural compounds.
DOI: 10.5286/isis.e.rb2510650-1
title: muSR study on highly frustrated triangular lattice compound Ba3YbRu2O9

description: The Ba3BRu2O9 (B=Transition-metal or Rare-earth) compounds have gained a lot of interest in recent years owing to the interesting observations of quantum spin liquid, orbital ordering, and complex magnetic ordering in these compounds. Here we propose to study one member of this family, Ba3YbRu2O9, a highly frustrated compound with a frustration index of ~50, by performing ZF- and LF-muSR experiments at the EMU spectrometer. The dc magnetization study on the compound reveals a magnetic transition at ~4.3 K. Interestingly, the specific heat data infers a broad anomaly centered at ~7.5 K suggesting short-range correlation in the paramagnetic state, along with a sharp anomaly at ~ 4.3 K. The deviation of the paramagnetic susceptibility from the Curie-Weiss behavior below ~100 K, a temperature much higher than the transition temperature of TN~4.3 K, also suggests the presence of short-range magnetic correlations in the paramagnetic state of the compound. The proposed ZF-muSR experiments will shed light on the short-range magnetic correlations in the compound, while LF-muSR scans will be helpful to get an estimate of the internal magnetic field to decouple the muon spins. Longitudinal field (LF) scans will help in understanding the role of any inhomogeneities/disorder in muon relaxation, if present, as reported for other Ba3YRu2O9 and Ba3InRu2O9 isostructural compounds.
DOI: 10.5286/isis.e.rb2510704
title: Tracking muons to their final states in model systems

description: We recently studied KF to investigate muon sites and diffusion pathways, owing to its simple structure and low cation nuclear moment. However, the data showed a very small asymmetry and strange relaxation that we were unable to explain. This result prompted us to consider muon behaviour more widely in the alkali halides, with previous studies suggesting a delayed diamagnetic state is formed through a prompt paramagnetic species. This early work proposed that state conversion is mediated by defect states. One of the crucial assumptions in μSR is that any defects that may be caused by the implantation of the muon are sufficiently far away that they do not affect the final muon spectra, but if the hypothesis from this early work is found to be correct then this could have profound implications for μSR. As alkali fluorides weren’t part of this early study and their measurements on the halides were carried out over a comparatively restricted temperature range, we believe that it’s opportune to take a fresh look at these materials. As well as at-resonance RF measurements to determine state conversion rates, we plan to use a combination of 90º pulsed RF methods and DFT to characterise the final states. The original study will be extended to encompass the alkali fluorides, where the F− ion so often plays a role in significantly modifying the muonic properties of these materials.
DOI: 10.3535/6vy-b3k-lmv
title: Lythrum salicaria L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/zfl-htj-26v
title: Trifolium aureum Pollich

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510362-1
title: Developing Study of Preservative Biocidal Action Using Neutron Reflection

description: Processed foods, medicine, hygiene, home and personal care products require preservation to control bio-contamination that may lead to risk of consumer infection, costly product recalls and failure to meet required shelf-life. Depending on their exact uses, preservatives mechanisms may differ, however little is known about these processes. This project aims to begin filling the gap, thereby providing insights to preservation development. The focus of this study is to explore how membrane surface activity of additive molecules function in boosting the biocidal efficacy and the spectrum of wide-ranging active ingredients against a broad spectrum of organisms and in diverse formulations. Polyol esters, such as propylene glycol mono caprylate (PGMC), are the preservative boosters preliminarily used in this study, alongside the preservative active, Phenoxyethanol (PE), as this is currently the most attractive combination.
DOI: 10.5286/isis.e.rb2510443
title: Magnetic interface profiles in amorphous spin-orbit torque switching structures

description: Spin-orbit torque-induced (SOT) magnetization switching is an important effect in spintronic applications such as magnetic random access memories, and spin logic devices. It is a very active topic of research and a number of different materials systems have been studied. SOT switching devices are layered structures composed of a thin magnetic layer (M) such as TbCo adjacent to a polycrystalline heavy metal (HM) layer such as Pt, Ta or W. The heavy metal layer is used to supply a spin current which generates the torque to switch the magnetic layer. A figure of merit for SOT switching is the switching efficiency which depends on the properties of the HM and the spin transport across the interface. The interface between the two layers is therefore critical. At the interface between a magnetic and non-magnetic material it is known that a magnetization can be induced in the non-magnetic material and this is known as the magnetic proximity effect. Despite its importance the magnetic proximity effect is often not considered in SOT switching studies. The objective is to determine the magnetization profile of HM|M multilayers with PNR measurements, with WSi, TaSi, and Pt as the HM and CoAlZr as the magnetic layer. This will allow us to determine whether the magnetic interfaces are sharp or whether the magnetization varies smoothly across the interface into the HM layer due to the magnetic proximity effect.
DOI: 10.5286/isis.e.rb2510443-1
title: Magnetic interface profiles in amorphous spin-orbit torque switching structures

description: Spin-orbit torque-induced (SOT) magnetization switching is an important effect in spintronic applications such as magnetic random access memories, and spin logic devices. It is a very active topic of research and a number of different materials systems have been studied. SOT switching devices are layered structures composed of a thin magnetic layer (M) such as TbCo adjacent to a polycrystalline heavy metal (HM) layer such as Pt, Ta or W. The heavy metal layer is used to supply a spin current which generates the torque to switch the magnetic layer. A figure of merit for SOT switching is the switching efficiency which depends on the properties of the HM and the spin transport across the interface. The interface between the two layers is therefore critical. At the interface between a magnetic and non-magnetic material it is known that a magnetization can be induced in the non-magnetic material and this is known as the magnetic proximity effect. Despite its importance the magnetic proximity effect is often not considered in SOT switching studies. The objective is to determine the magnetization profile of HM|M multilayers with PNR measurements, with WSi, TaSi, and Pt as the HM and CoAlZr as the magnetic layer. This will allow us to determine whether the magnetic interfaces are sharp or whether the magnetization varies smoothly across the interface into the HM layer due to the magnetic proximity effect.
DOI: 10.34816/ifao.archives.232991
title: SAQQARA_nb_1994_06062

description: Référence : nb_1994_06062<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/6m1-b23-g5c
title: Carex pallescens L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/kgh-xq6-3zm
title: Melilotus albus Medik.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410305-2
title: FePSe3: Probing and fitting spin orbit excitons in 2d magnets

description: FePSe3 is a two dimensional material which has an orbital degeneracy tied to the Fe2+ site. FePSe3 undergoes a combined structural and magnetic transition at around 110 K. We propose to measure the spin-orbit excitations in this material using the MAPS spectrometer. The two dimensional nature will make this compound an ideal system to attempt fits of our spin-orbit exciton models to and also apply newly developed machine learning algorithms. This will allow us to characterize the various competing single-ion and magnetic exchange terms in the magnetic Hamiltonian and relate these to the magnetoelastic properties.
DOI: 10.5286/isis.e.rb2510107-2
title: Effect of layer stacking and cooling conditions on residual stress distribution in wire arc additive manufactured duplex stainless steel
DOI: 10.5286/isis.e.rb2510362
title: Developing Study of Preservative Biocidal Action Using Neutron Reflection

description: Processed foods, medicine, hygiene, home and personal care products require preservation to control bio-contamination that may lead to risk of consumer infection, costly product recalls and failure to meet required shelf-life. Depending on their exact uses, preservatives mechanisms may differ, however little is known about these processes. This project aims to begin filling the gap, thereby providing insights to preservation development. The focus of this study is to explore how membrane surface activity of additive molecules function in boosting the biocidal efficacy and the spectrum of wide-ranging active ingredients against a broad spectrum of organisms and in diverse formulations. Polyol esters, such as propylene glycol mono caprylate (PGMC), are the preservative boosters preliminarily used in this study, alongside the preservative active, Phenoxyethanol (PE), as this is currently the most attractive combination.
DOI: 10.3535/v2c-13f-jf8
title: Medicago × varia Martyn

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510124
title: Influences of shear and crystallising solutes on structure of surfactant-free microemulsions

description: Surfactant free microemulsions (or structured ternary fluids) have emerged in recent years as materials with great potential for providing the bespoke environments of microemulsions without requiring surfactants. As such these liquids may offer environmentally benign reaction media for many processes. To date, while there have been limited studies of their structure, these studies have not yet considered the influences of either shearing or dissolved components on the nanometre-scale domains that are important to their properties. Here we propose to explore these effects for a simple (octanol - ethanol - water) structured ternary fluid and for the first time study this system at compositions near the phase boundary while under shear and when loaded with model glycine solutes.
DOI: 10.5286/isis.e.rb2510124-1
title: Influences of shear and crystallising solutes on structure of surfactant-free microemulsions

description: Surfactant free microemulsions (or structured ternary fluids) have emerged in recent years as materials with great potential for providing the bespoke environments of microemulsions without requiring surfactants. As such these liquids may offer environmentally benign reaction media for many processes. To date, while there have been limited studies of their structure, these studies have not yet considered the influences of either shearing or dissolved components on the nanometre-scale domains that are important to their properties. Here we propose to explore these effects for a simple (octanol - ethanol - water) structured ternary fluid and for the first time study this system at compositions near the phase boundary while under shear and when loaded with model glycine solutes.
DOI: 10.21233/n3zv3g
title: Sarcpa Lake pollen surface sample dataset

description: Raw data for the Sarcpa Lake pollen surface sample dataset submitted to the Neotoma Paleoecology Database. Data is available through the landing page in JSON format. The landing page referenced by the DOI also contains links to publications and a map-based viewer for the dataset. The Neotoma Paleoecology Database maintains a homepage at https://www.neotomadb.org.
DOI: 10.34816/ifao.archives.232992
title: SAQQARA_nb_1994_06063

description: Référence : nb_1994_06063<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/3aw-r12-ds2
title: Ornithopus sativus Brot.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/734-gg0-s59
title: Robinia pseudoacacia L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420043-1
title: Disentangling the Phase Diagram of MAPbBr3 at Pressure

description: Metal halide perovskites have emerged as a class of promising semiconductors for high-performance optoelectronics devices. However, a clear understanding of the relationship between their physical structures and electronic properties is still missing due to the limitation of as-synthesised perovskites and the Goldschmidt tolerance factor. Especially, limited studies have been conducted on perovskites with organic cations under pressure and there is still much controversy. We propose to perform a large volume neutron diffraction experiment at high pressure looking at the structural transformation sequence of MAPbBr3 in a variety of pressure transmitting media. This will not only disentangle the issue of the pressure transmitting media on the phase diagram but also provide a unique set of crystallographic information in each of the phases observed upon compression which only the use of neutron diffraction can provide.
DOI: 10.5286/isis.e.rb2510735
title: Negative thermal expansion in Ag2O

description: It is proposed to investigate the origin of negative thermal expansion (NTE) in Ag2O by measuring the neutron correlation function on GEM as a function of temperature. The structure of Ag2O involves two identical interpenetrating networks of corner-sharing OAg4 tetrahedra, and it is anticipated that the NTE may arise as a result of collective intra-network motions of the tetrahedra.
DOI: 10.5286/isis.e.rb2510735-1
title: Negative thermal expansion in Ag2O

description: It is proposed to investigate the origin of negative thermal expansion (NTE) in Ag2O by measuring the neutron correlation function on GEM as a function of temperature. The structure of Ag2O involves two identical interpenetrating networks of corner-sharing OAg4 tetrahedra, and it is anticipated that the NTE may arise as a result of collective intra-network motions of the tetrahedra.
DOI: 10.3535/dg8-b26-ga7
title: Lathyrus pratensis L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/h0x-ajk-2j7
title: Panicum dichotomiflorum Michx.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420043
title: Disentangling the Phase Diagram of MAPbBr3 at Pressure

description: Metal halide perovskites have emerged as a class of promising semiconductors for high-performance optoelectronics devices. However, a clear understanding of the relationship between their physical structures and electronic properties is still missing due to the limitation of as-synthesised perovskites and the Goldschmidt tolerance factor. Especially, limited studies have been conducted on perovskites with organic cations under pressure and there is still much controversy. We propose to perform a large volume neutron diffraction experiment at high pressure looking at the structural transformation sequence of MAPbBr3 in a variety of pressure transmitting media. This will not only disentangle the issue of the pressure transmitting media on the phase diagram but also provide a unique set of crystallographic information in each of the phases observed upon compression which only the use of neutron diffraction can provide.
DOI: 10.5286/isis.e.rb2510427
title: Pore structure characterization of mesoporous silica for hemodialysis applications: Small angle neutron scattering (SANS) study

description: Accumulation of uremic toxins cause serious problems for kidney failure patient. Adsorbents like mesoporous silica (MS), has potential to remove uremic toxin in hemodialysis process. It can be conducted by incorporating the MS with polymer to become hybrid membrane or as separated component in dialyzer device. Amine group grafted on MS was known to increase the adsorption of uremic toxin such as urea and creatinine. In this study, we synthesize mesoporous silica with variation of CTAB, TEOS, and NaOH concentration to make different pore size and structure and functionalized them. Since the adsorption capability of MS is laid on its pore and surface structure, it is important to observed the roughness of the MS surface and the pores, and see the dominant parameter in the adsorption whether it is the pore or the roughness. In other side, our previous study showed that the shape of micelle (oblate or prolate) affecting the resulted pore structure of MS. Therefore, to achieve a comprehensive understanding of the MS, the study of CTAB micellization as a templating agent will also study to further development on MS synthesis as potential adsorbent for uremic toxin removal. All those studies can be done using small angle neutron scattering (SANS) by applying contrast match.
DOI: 10.5286/isis.e.rb2510427-1
title: Pore structure characterization of mesoporous silica for hemodialysis applications: Small angle neutron scattering (SANS) study

description: Accumulation of uremic toxins cause serious problems for kidney failure patient. Adsorbents like mesoporous silica (MS), has potential to remove uremic toxin in hemodialysis process. It can be conducted by incorporating the MS with polymer to become hybrid membrane or as separated component in dialyzer device. Amine group grafted on MS was known to increase the adsorption of uremic toxin such as urea and creatinine. In this study, we synthesize mesoporous silica with variation of CTAB, TEOS, and NaOH concentration to make different pore size and structure and functionalized them. Since the adsorption capability of MS is laid on its pore and surface structure, it is important to observed the roughness of the MS surface and the pores, and see the dominant parameter in the adsorption whether it is the pore or the roughness. In other side, our previous study showed that the shape of micelle (oblate or prolate) affecting the resulted pore structure of MS. Therefore, to achieve a comprehensive understanding of the MS, the study of CTAB micellization as a templating agent will also study to further development on MS synthesis as potential adsorbent for uremic toxin removal. All those studies can be done using small angle neutron scattering (SANS) by applying contrast match.
DOI: 10.34816/ifao.archives.232993
title: SAQQARA_nb_1994_06064

description: Référence : nb_1994_06064<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/gv6-5lw-hf1
title: Brachypodium sylvaticum subsp. sylvaticum

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.