Search query: Phase relations of the Cu2S-Sb2S3 system

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abstract: Abstract Phase relations along the Cu2S(Sb2S3, PbSb2S4, Pb5Sb4S11) PbCuSbS3 joins in the pseudoternary system Cu2S PbS Sb2S3 have been studied using a variety of physicochemical characterization techniques (differential thermal analysis, X ray diffraction, microstructural analysis, microhardness tests, and immersion density measurements) All of the joins have been shown to be pseudobinary, with eutectic phase relations. We have investigated the electrical transport properties of (Sb2S3)1 x(PbCuSbS3)x solid solutions, which have been shown to be p type semiconductors.
author_names: O M Aliyev

Dilbar S Ajdarova

Reyhan M Agayeva

T F Maksudova

Sh H Mamedov
title: Phase Relations along the Cu2S(Sb2S3, PbSb2S4, Pb5Sb4S11) PbCuSbS3 Joins in the Pseudoternary System Cu2S PbS Sb2S3 and Physical Properties of (Sb2S3)1 x(PbCuSbS3)x Solid Solutions
venue: Inorganic Materials
year: 2018

abstract: Abstract An updated thermodynamic database for Ag2S Cu2S ZnS Sb2S3 As2S3 sulfides and sulfosalts applicable to temperatures above 119degC is developed to calculate phase relations for polybasite pearceite and fahlore bearing assemblages. It is based on pre existing and new constraints on activity composition, Ag Cu and As Sb partitioning, and other relations, and on experiments (200 300degC, evacuated silica tubes) conducted to define the stability of the polybasite pearceite (Ag1 x,Cux)16(Sb1 y,Asy)2S11] ZnS sphalerite assemblage with respect to assemblages containing (Ag,Cu)2S sulfides coexisting with (Cu, Ag)10Zn2(Sb,As)4S13 fahlore sulfosalts. It was found that the thermodynamics of mixing of bcc and hcp (Ag,Cu)2S solutions, which are fast ion conductors, may be described by using site multiplicities of metals aAg,Cu 2 and temperature dependent regular solution parameters. We obtained estimates for the Gibbs energies of formation for Ag16Sb2S11 and Cu16Sb2S11 polybasite endmembers from the simple sulfides (Ag2S, Cu2S, and Sb2S3) of 30.79 and 4.07 kJ/gfw at 200degC, and 32.04 and 0.59 kJ/gfw at 400degC, respectively, that are about one half kJ/gfw more positive and about 6 kJ/gfw more negative than those estimated by Harlov and Sack (1995b) The corresponding estimates for formation energies of Ag10Zn2Sb4S13 and Cu10Zn2Sb4S13 fahlores 20.29 and 105.29 kJ/gfw at 200degC and 23.72 and 105.76 kJ/gfw at 400degC) are comparable to, and roughly 110 kJ/gfw more positive than, the corresponding estimates of Ebel and Sack (1994) We also determined that the Gibbs energies of the As Sb exchange reactions: 1 4 Ag 10 Zn 2 Sb 4 S 13 1 2 Ag 16 As 2 S 11 1 2 Ag 16 Sb 2 S 11 1 4 Ag 10 Zn 2 As 4 S 13 Sb fahlore pearceite polybasite As fahlore and Ag 3 SbS 3 1 2 Ag 16 As 2 S 11 1 2 Ag 16 Sb 2 S 11 Ag 3 AsS 3 pyrargyrite pearceite polybasite proustite are, respectively, 8.75 and 0.40 kJ/gfw in the range 150 350degC, and these predictions are consistent with As Sb partitioning relations observed in nature and produced in laboratory studies. Finally, we obtain estimates for the Gibbs energies of formation of Cu10Fe2Sb4S13 and Ag10Fe2Sb4S13 fahlores 63.92 and +11.46 kJ/gfw at 200degC and 75.73 and 3.31 kJ/gfw at 400degC)
author_names: Richard O Sack
title: Internally consistent database for sulfides and sulfosalts in the system Ag2S Cu2S ZnS FeS Sb2S3 As2S3: Update
year: 2000

abstract: Multiple system atrophy (MSA) is a rare and fatal neurodegenerative disease with limited symptomatic treatment options. Aggregation of a synuclein in oligodendrocytes is believed to be a central mechanism of the neurodegenerative process. PD01A and PD03A are 2 novel therapeutic vaccine candidates containing short peptides as antigenic moieties that are designed to induce a sustained antibody response, specifically targeting pathogenic assemblies of a synuclein. The objectives of the current study were to evaluate primarily the safety and tolerability of PD01A and PD03A in patients with early MSA. Thirty patients (11 women) were randomized to receive 5 subcutaneous injections of either PD01A (n 12) PD03A (n 12) or placebo (n 6) in this patient and examiner blinded, placebo controlled, 52 week phase 1 clinical trial (ClinicalTrial.gov identifier: NCT02270489) Immunogenicity and clinical scores were assessed as secondary objectives. Twenty nine patients reported a total of 595 treatment emergent adverse events (mild or moderate, n 555; severe, n 40) Treatment related adverse events included 190 injection site reactions typically observed in vaccination trials with similar per subject incidence in the treatment groups over time. Sustained IgG titers were observed in the PD01A treated group, and 89% of treated patients developed a PD01 specific antibody response after receiving all injections. Induced antibodies displayed clear reactivity to the a synuclein target epitope. Titers and antibody responder rate (58% were lower in the PD03A treated group. In conclusion, both PD01A and PD03A were safe and well tolerated. PD01A triggered a rapid and long lasting antibody response that specifically targeted the a synuclein epitope. (c) 2020 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
author_names: Wassilios G Meissner

Anne Pavy-Le Traon

Alexandra Foubert-Samier

Gergana Galabova

Monique Galitzky

Alexandra Kutzelnigg

Brice Laurens

Petra Luhrs

Rossella Medori

Patrice Peran

Umberto Sabatini

Sylvain Vergnet

Dieter Volc

Werner Poewe

Achim Schneeberger

Gunther Staffler

Olivier Rascol
title: A Phase 1 Randomized Trial of Specific Active a Synuclein Immunotherapies PD01A and PD03A in Multiple System Atrophy
venue: Movement disorders official journal of the Movement Disorder Society
year: 2020

abstract: In this work, we study the evolution of the mass metallicity relations (MZRs) as predicted by the GAlaxy Evolution and Assembly (GAEA) semi analytic model. We contrast these predictions with recent results from the VANDELS survey, that allows us to expand the accessible redshift range for the stellar MZR up to z 3.5. We complement our study by considering the evolution of the gas phase MZR in the same redshift range. We show that GAEA is able to reproduce the observed evolution of the z 3.5 gas phase MZR and z 0.7 stellar MZR, while it overpredicts the stellar metallicity at z 3.5. Furthermore, GAEA also reproduces the so called fundamental metallicity relation (FMR) between gas phase metallicity, stellar mass and star formation rate (SFR) In particular, the gas phase FMR in GAEA is already in place at z 5 and shows almost no evolution at lower redshift. GAEA predicts the existence of a stellar FMR, that is, however, characterized by a relevant redshift evolution, although its shape follows closely the gas phase FMR. We also report additional unsolved tensions between model and data: the overall normalization of the predicted MZR agrees with observations only within ~0.1 dex; the largest discrepancies are seen at z 3.5 where models tend to slightly overpredict observed metallicities; the slope of the predicted MZR at fixed SFR is too steep below a few M yr Finally, we provide model predictions for the evolution of the MZRs at higher redshifts, that would be useful in the context of future surveys, like those that will be performed with JWST.
author_names: Fabio Fontanot

Antonello Calabro

Margherita Talia

Filippo Mannucci

M Castellano

Giovanni Cresci

Gabriella De Lucia

Anna R Gallazzi

Michaela Hirschmann

Laura Pentericci

Lizhi Xie

Ricardo Amorin

Micol Bolzonella

A Bongiorno

Olga Cucciati

Fergus Cullen

Johan P U Fynbo

Nimish P Hathi

Pascale Hibon

Ross J McLure

Lucia Pozzetti
title: The evolution of the mass metallicity relations from the VANDELS survey and the gaea semi analytic model
year: 2021

abstract: The CMS detector at the CERN LHC features a silicon pixel detector as its innermost subdetector. The original CMS pixel detector has been replaced with an upgraded pixel system (CMS Phase 1 pixel detector) in the extended year end technical stop of the LHC in 2016/2017. The upgraded CMS pixel detector is designed to cope with the higher instantaneous luminosities that have been achieved by the LHC after the upgrades to the accelerator during the first long shutdown in 2013 2014. Compared to the original pixel detector, the upgraded detector has a better tracking performance and lower mass with four barrel layers and three endcap disks on each side to provide hit coverage up to an absolute value of pseudorapidity of 2.5. This paper describes the design and construction of the CMS Phase 1 pixel detector as well as its performance from commissioning to early operation in collision data taking.
author_names: The Hydrogen Epoch of Reionization Array Collaboration
title: The CMS Phase 1 Pixel Detector Upgrade
year: 2020

abstract: Reconfigurable photonic systems featuring minimal power consumption are crucial for integrated optical devices in real world technology. Current active devices available in foundries, however, use volatile methods to modulate light, requiring a constant supply of power and significant form factors. Essential aspects to overcoming these issues are the development of nonvolatile optical reconfiguration techniques which are compatible with on chip integration with different photonic platforms and do not disrupt their optical performances. In this paper, a solution is demonstrated using an optoelectronic framework for nonvolatile tunable photonics that employs undoped graphene microheaters to thermally and reversibly switch the optical phase change material Ge$_2$Sb$_2$Se$_4$Te$_1$ (GSST) An in situ Raman spectroscopy method is utilized to demonstrate, in real time, reversible switching between four different levels of crystallinity. Moreover, a 3D computational model is developed to precisely interpret the switching characteristics, and to quantify the impact of current saturation on power dissipation, thermal diffusion, and switching speed. This model is used to inform the design of nonvolatile active photonic devices; namely, broadband Si$_3$N$_4$ integrated photonic circuits with small form factor modulators and reconfigurable metasurfaces displaying 2$\pi$ phase coverage through neural network designed GSST meta atoms. This framework will enable scalable, low loss nonvolatile applications across a diverse range of photonics platforms.
author_names: Carlos R'ios

Yifei Zhang

Mikhail Y Shalaginov

Skylar Deckoff-Jones

Haozhe Wang

Sensong An

Hualiang Zhang

Myungkoo Kang

Kathleen A Richardson

Christopher M Roberts

Jeffrey B Chou

Vladimir Liberman

Steven A Vitale

Jing Kong

Tian Gu
title: Multi Level Electro Thermal Switching of Optical Phase Change Materials Using Graphene
year: 2020

abstract: We have determined the three dimensional structure of the Magellanic Clouds and Magellanic Bridge using over $9\,000$ Classical Cepheids (CCs) and almost $23\,000$ RR~Lyrae (RRL) stars from the fourth phase of the OGLE project. For the CCs we calculated distances based on period luminosity relations. CCs in the LMC are situated mainly in the bar that shows no offset from the plane of the LMC. The northern arm is also very prominent with an additional smaller arm. Both are located closer to us than the entire sample. The SMC has a non planar structure that can be described as an ellipsoid extended almost along the line of sight. We also classified nine of our CCs as Magellanic Bridge objects. These Cepheids show a large spread in three dimensions. For the RRL stars, we calculated distances based on photometric metallicities and theoretical relations. Both Magellanic Clouds revealed a very regular structure. We fitted triaxial ellipsoids to our LMC and SMC samples. In the LMC we noticed a very prominent, non physical blend artifact that prevented us from analyzing the central parts of this galaxy. We do not see any evidence of a bridge like connection between the Magellanic Clouds.
author_names: Anna M Jacyszyn-Dobrzeniecka

the Ogle Team
title: Three Dimensional Structure of the Magellanic System
year: 2018

abstract: During the high luminosity phase of the LHC (HL LHC) planned to start around 2026, the accelerator is expected to deliver an instantaneous peak luminosity of up to 7.5x1034 cm 2s 1. A total of 3000 fb 1 of integrated luminosity is foreseen to be delivered to the general purpose detectors ATLAS and CMS over a decade, thereby increasing the discovery potential of the LHC experiments significantly. The CMS detector will undergo a major upgrade for the HL LHC, with entirely new tracking detectors consisting of an Outer Tracker and Inner Tracker. However, the new tracking system will be exposed to a significantly higher radiation than the current tracker, requiring new radiation hard sensors. CMS initiated an extensive irradiation and measurement campaign starting in 2009 to systematically compare the properties of different silicon materials and design choices for the Outer Tracker sensors. Several test structures and sensors were designed and implemented on 18 different combinations of wafer materials, thicknesses, and production technologies. The devices were electrically characterized before and after irradiation with neutrons, and with protons of different energies, with fluences corresponding to those expected at different radii of the CMS Outer Tracker after 3000 fb 1. The tests performed include studies with b sources, lasers, and beam scans. This paper compares the performance of different options for the HL LHC silicon sensors with a focus on silicon bulk material and thickness.
author_names: The Hydrogen Epoch of Reionization Array Collaboration
title: Experimental Study of Different Silicon Sensor Options for the Upgrade of the CMS Outer Tracker
year: 2020

abstract: Complex organic molecules with three carbon atoms are found in the earliest stages of star formation. In particular, propenal (C$_2$H$_3$CHO) is a species of interest due to its implication in the formation of more complex species and even biotic molecules. This study aims to search for the presence of C$_2$H$_3$CHO and other three carbon species such as propylene (C$_3$H$_6$ in the hot corino region of the low mass protostellar binary IRAS 16293 2422 to understand their formation pathways. We use ALMA observations in Band 6 and 7 from various surveys to search for the presence of C$_3$H$_6$ and C$_2$H$_3$CHO towards the protostar IRAS 16293 2422 B (IRAS 16293B) We report the detection of both C$_3$H$_6$ and C$_2$H$_3$CHO towards IRAS 16293B, however, no unblended lines were found towards the other component of the binary system, IRAS 16293A. We derive column density upper limits for C$_3$H$_8$ HCCCHO, n C$_3$H$_7$OH, i C$_3$H$_7$OH, C$_3$O, and cis HC(O)CHO towards IRAS 16293B. We then use a three phase chemical model to simulate the formation of these species in a typical prestellar environment followed by its hydrodynamical collapse until the birth of the central protostar. Different formation paths, such as successive hydrogenation and radical radical additions on grain surfaces, are tested and compared to the observational results. The simulations reproduce the abundances within one order of magnitude from those observed towards IRAS 16293B, with the best agreement found for a rate of $10^ 12} cm$^3$ s$ 1} for the gas phase reaction C$_3$ O \rightarrow$ C$_2$ CO. Successive hydrogenations of C$_3$ HC(O)CHO, and CH$_3$OCHO on grain surfaces are a major and crucial formation route of complex organics molecules, whereas both successive hydrogenation pathways and radical radical addition reactions contribute to the formation of C$_2$H$_5$CHO.
author_names: S Manigand

Audrey Coutens

J C Loison

Valentine Wakelam

Hannah Calcutt

Jes K Jorgensen

Vianney Taquet

Susanne F Wampfler

Tyler L Bourke

B M Kulterer

Ewine F van Dishoeck

Maria Nikolayevna Drozdovskaya

Niels F W Ligterink
title: The ALMA PILS survey: first detection of the unsaturated 3 carbon molecules Propenal (C2H3CHO) and Propylene (C3H6) towards IRAS 16293 2422 B
year: 2020

abstract: The defect chemistry of perovskite compounds is directly related to the stoichiometry and to the valence states of the transition metal ions. Such relations are of high interest as they offer the possibility to influence the catalytic activity of perovskites for the application in solid oxide fueland electrolyser cells. Combining theoretical and experimental approaches, we explore the feasibility of actively manipulating the valence state of Fe and the concentration of point defects by synthesizing non stoichiometric LaFeO3 (LFO) In the theoretical part, formation energies and concentrations of point defects were determined as a function of processing conditions by first principles DFT+U calculations. Based on the DFT+U results, significant compositional deviations from stoichiometric LFO cannot be expected by providing rich or poor conditions of the oxidic precursor compounds (Fe2O3 and La2O3) in a solid state processing route. In the experimental part, LFO was synthesized with a targeted La site deficiency. We analyze the resulting phases in detail by X ray diffraction and dedicated microscopy methods, namely scanning electron microscopy (SEM) and (scanning) transmission electron Microscopy (S)TEM) in combination with energy dispersive X ray spectroscopy (EDS) and electron energy loss spectrometry (EELS) Instead of a variation of the La/Fe ratio, a mixture of two phases, Fe2O3/LaFeO3, was observed resulting in an invariant charge state of Fe, which is in line with the theoretical results. We discuss our findings with respect to partly differing assumptions made in previously published studies on this material system.
author_names: Daniel Mutter

Daniel F Urban

Ch Elsasser

Roland Schierholz

Sabrina A Heuer

Thorsten Ohlerth

Hans Kungl

Rudiger-A Eichel Fraunhofer Iwm

Freiburg Materials Research Center

University of Freiburg

Forschungszentrum Julich GmbH

Institute of Energy

Climate Research

Rwth Aachen University

Institute for Physical Chemistry
title: Defects and phase formation in non stoichiometric LaFeO$_3$ a combined theoretical and experimental study
year: 2021