bluuebunny/crossref_metadata_2025_split huggingface dataset:
Type-II van der Waals heterostructures constructed by V-V binary monolayers for ultra-thin solar cells
Authors: Zhao Huiyan , Wei Feng , Jia Baonan , Gao Jingming , Zhao Jiaxiang , Liu Gang , Lu Pengfei 
Published: November 2023

Abstract
The development of solar cells holds great importance in the field of renewable energy and sustainability. Type-II van der Waals heterostructures, constructed from V-V binary monolayers, which exhibit easily-tunable electronic and optical properties, represent promising materials. In this work, we constructed and screened type-II van der Waals heterostructures using V-V binary monolayers for ultra-thin solar cells, and predicted their solar cell performance based on first-principles study. Five stable type-II van der Waals heterostructures were selected from forty-five heterostructures. The results showed that BiP/SbAs and BiP/BiAs heterostructures are promising candidates for solar cells with the power conversion efficiency as high as 17% and well light absorption performance. It will provide insights into the development and refinement of ultra-thin photovoltaic cells utilizing type-II van der Waals heterostructures composed of V-V binary monolayers.
Life cycle assessment of SBS modified bitumen waterproofing membrane
Authors: Chen Tao , Zheng Yan , Liu Yu , Li Xiaoqing , Gong Xianzheng 
Published: November 2023

Abstract
Building waterproofing membranes constitute essential components of construction materials. This study utilizes the life cycle assessment (LCA) methodology to develop a comprehensive life cycle inventory and conduct an environmental impact assessment of typical styrene-butadiene-styrene (SBS) modified bitumen waterproofing membrane products. The main research objective of this paper is to identify the key factors influencing the environmental impact of products and to provide data for the selection of green materials in the construction industry. The results reveal that the production of raw materials for SBS-modified bitumen waterproofing membranes contributes the most to all environmental impact categories, followed by the transportation and energy production stages, while the production stage of the membranes exhibits a relatively smaller contribution. Within the raw material production stage, the bitumen production process exhibits the highest contribution to fossil fuel depletion (FFP) environmental impact, surpassing 50%. The production process of polyester tire cloth demonstrates the greatest influence on human toxicity potential (HTPc), global warming potential (GWP), freshwater eutrophication (FEP), marine eutrophication potential (MEP), and mineral resource scarcity potential (SOP), accounting for 54.63%, 32.86%, 68.55%, 72.41%, and 61.69%, respectively. Additionally, the production process of base oil exhibits the most significant contribution to fine particulate matter formation (PMFP) and terrestrial acidification potential (AP) among the environmental impact indicators. Variations in the quantities of polyester tire cloth and base oil exhibit the most notable influence on the environmental indicators of the product. Specifically, the sensitivity analysis reveals that polyester tire cloth has the greatest impact on mineral resource scarcity potential (SOP); base oil exhibits the highest sensitivity to fossil fuel depletion (FFP).
Progress in Green and Low-carbon Technologies development of Building Ceramics Industry
Authors: Liu Jianing , Liu Yu , Zheng Yan , Li Xiaoqing 
Published: November 2023

Abstract
As global and domestic concerns about climate change intensify, the development and adoption of green and low-carbon manufacturing technologies to effectively reduce resource consumption, energy usage, and greenhouse gas emissions have emerged as primary trends in the evolution of the building ceramics industry under the backdrop of the “dual carbon” strategy. This article systematically reviews the commercially applied and research-stage green and low-carbon technologies within the current building ceramics industry. It conducts a carbon emission reduction potential analysis for various technologies, identifies constraints in the technology promotion process, and highlights the substantial carbon reduction potential of clean energy substitution technologies and manufacturing process optimization technologies. Technologies such as raw material substitution, high-quality service, and waste ceramic tile recycling and regeneration contribute significantly to economic and environmental benefits, but are still in developmental stages. The article also discusses the application of methods such as life cycle assessment and carbon footprint analysis in the evaluation of green and low-carbon technologies in the field of building ceramics. It discusses the trends and limiting factors of different green and low-carbon technologies, offering suggestions and support for the building ceramics industry’s transition towards a low-carbon and environmentally friendly direction.
DFT predicting structural stability of Li-doped Al-Li solid solution using first principles
Authors: Huang Lei , Zhou Xing 
Published: November 2023

Abstract
By using the first-principles method based on density functional theory (DFT), the CASTEP module in Materials studio was used to calculate the substitution positions of Li atom doped with Al lattice, and different substitution configurations, total energy, average atom formation energy, and charge density distributions were calculated. By calculating the total energy and the average forming energy of atoms, it is concluded that when the Li atom is doped with an Al lattice to form a replacement solid solution, it is the easiest to replace the Al atom on the surface, and the resulting replacement solid solution has the smallest binding energy and the most stable structure. By calculating the density of electron states and analyzing the Fermi energy surface, it is found that the Al-Li solid solution substituting Al atoms at the zero Fermi surface has the smallest electron state density and the most stable structure.
Process Optimization Method for Inhibiting TCP Precipitation in A Nickel-Based Single Crystal Superalloy with High Refractory Element Content
Authors: Yue X D , Wang R , Zhao J Q , Shi Z X , Yang W P , Li J R 
Published: November 2023

Abstract
In order to study the optimization method of microstructure stability of high generation single crystal superalloys, the influence of manufacturing process on the microstructure stability of a single crystal superalloy containing high content of refractory elements was studied, and the corresponding process optimization method was obtained. The microstructure characteristics of the alloy at different stages were observed and the corresponding element distribution were tested. The microstructure and element distribution of the alloy at different stages of preparation were analyzed with the assistance of kinetic calculation. Results show that the element dendrite segregation is an important reason to reduce microstructural stability. Reducing the dendrite spacing in directional solidification and increasing element diffusion in solid solution heat treatment can reduce the segregation of refractory elements in the dendrite core. As a result, less TCP precipitates in the dendrite core, and thus improve microstructure stability. Based on analyzed results, the manufacturing process were optimized and proved to be effective.
Influence of Alloying Elements Content on High Temperature Properties of Ti-V-Cr and Ti-Al-V Series Titanium Alloys: A JMatPro Program Calculation Study
Authors: Sun Ruochen , Mi Guangbao 
Published: November 2023

Abstract
For the issues of high temperature performance affected by the alloying elements content in Ti-V-Cr and Ti-V-Cr alloys, the thermodynamic calculation method based on JMatPro program was applied in this study. The research is mainly focused on the analysis of phase composition, thermodynamic parameters and mechanical properties of Ti-Al-V and Ti-V-Cr series alloys with different element proportions under high temperature environment. Those obtained results show that the proportion of Al in Ti-Al-V alloys has a great influence on the high temperature properties. Increasing the content of Al not only increases the transformation temperature of β single-phase structure and delays the transformation process of α/β microstructure to β single-phase structure, but also helps to improve the high temperature thermal conductivity and elastic deformation resistance of the alloy. In Ti-V-Cr alloys, the influence of V element on high temperature properties is mainly focused on the improvement of thermal conductivity and high temperature deformation properties, while the influence of Cr element is relatively weak. Besides, adding a small amount of Al element to Ti-V-Cr alloy can further improve the thermal conductivity of the alloy. The Young’s modulus of the Ti-V-Cr alloy increases when 0.3%-1% of C element is added. Finally, the effect of Si element on the high temperature elastic deformation of the alloy is relatively weak.
Oxygen vacancy induced conductivity in Sr
n+1Ti
n
O3n+1/SrTiO3 heterostructures
Authors: Zhang T T , Chen X F , Lv Y Q , Wen K R , Du W , Xiao Y X 
Published: November 2023

Abstract
SrTiO3-based heterostructures have attracted much attention due to the abundant properties compared to single components. Here, we fabricate oxide heterostructure of layed perovskite/perovskite Sr
n+1Ti
n
O3n+1/SrTiO3 and investigate the n value-dependent and thickness-dependent conductivity. X-ray diffraction peaks and reflective high energy electron diffraction indicate good film quality. For films of n=6, the heterostructures are conductive, and the conductivity is better for thicker film. On the contrary, heterostructures with films of n=1, 2, 3, 4, ∞ are insulating. Conductive atomic force microscopy results and surface conductivity tests manifest that the oxygen vacancy induced conductive layer exists near the interface between film and substrate. This work provides feasible method to modulate the transport properties of functional transition metal oxides.
Effect of coiling temperature on the microstructure and mechanical properties of DP 980 steel
Authors: Jiang Yinghua , Liu Huasai 
Published: November 2023

AbstractThe effect of coiling temperature on the microstructure and mechanical properties of annealed dual phase steels was investigated. It was found that the rate of ferrite recrystallization with coiling temperature 550°C is faster than that with coiling temperature 650°C. That is low coiling temperature accelerates the recrystallization of ferrite during heating compared with high coiling temperature, which in turn promotes the formation of austenite through the nucleation process. Under the same annealing conditions, the martensite content of annealed steels obtained at low temperature coiling 550°C is higher than that of annealed steels obtained at high coiling temperature 650°C. Compared with high coiling temperature, the low coiling temperature favors the formation of the homogeneous and fine microstructure. Thus, the dual phase steel obtained at low coiling temperature has finer and uniform microstructure and high hole expansion ratio at annealing temperature 800°C in comparision with the dual phase steel obtained at high coiling temperature.
Compression performance and low-frequency damping characteristics of pyramidal lattice cylinder skeleton structure
Authors: Li Zeyu , Hu Feng , Lin Congcong , Xue Xin 
Published: November 2023

Abstract
The lattice structure has obvious advantages over traditional materials in terms of light weight, energy absorption, vibration and noise reduction, and is therefore widely used in many fields such as shipping and aerospace. In this work, a cylinder skeleton structure is designed based on pyramidal lattice structure by circumferential and axial array arrangement. The load-bearing capacity of the pyramidal lattice cylinder skeleton structure under quasi-static compression and its axial vibration characteristics are investigated by numerical method. The effects of key element geometric parameters such as diameter of metal wire, circumferential angle and axial angle on the compression and vibration damping performances of the pyramidal lattice cylinder skeleton structure were investigated. The results show that the developed structure has excellent compression and vibration damping capacity. It is able to provide a pronounced damping effect in the low-frequency range of 204-367 Hz, and the attenuation intensity of elastic wave in this frequency range can be up to 20dB.
Effect of the addition of acetic acid on spinning sol and mullite fibers properties
Authors: Wang X P , Liu Z , Qi X L , Zhang M X , Li R , Xu H N , Wang Y J , Ding W C 
Published: November 2023

Abstract
The preparation of mullite fibers by sol-gel method is the preferred method in industrial production, where the stability, rheological properties and microstructure of spinning sols are essential for the preparation of continuous, low-defect fibers. In this study, aluminum carboxylate solutions (ACs) were prepared using aluminum powder, formic acid and acetic acid as raw materials, silica sol was added, and spinnable sol was obtained by concentration and aging. After dry spinning and calcination at 1200 °C, continuous mullite fibers with mullite as the main crystal phases were obtained. The effect of acetic acid addition on the stability of Al-Si mixed sol was studied, and the polymerization process of spinning sol was studied on its rheological properties and microstructure. The cross-section of mullite fibers obtained after calcination at 1200 °C was “dumbbell” type, and the cause of this cross-section was discussed, which laid a foundation for subsequent optimization research.
Study on the flowability and strength of cement-based materials added with limestone powder and PVA fiber
Authors: Xie Weiliang , Chen Jiajian , Duan Denghui 
Published: November 2023

Abstract
In order to improve the mechanical properties of cement-based materials, limestone powder (LP) was used as a filler as 0% to 20% cement paste replacement by volume in the mortar. Polyvinyl alcohol (PVA) fiber with 0% to 0.6% by volume were added to produce multiple sets of cement-based materials for basic mechanical properties tests including flowability, compressive strength and tensile strength. The test results indicated that an increase in the amount of PVA fiber and the replacement amount of LP continuously reduce the flowability of cement-based materials. PVA fiber led to the most significant reduction effect. The addition of an appropriate amount of PVA fiber can improve the tensile and compressive strength of cement-based materials, but excessive addition has a negative impact on the compressive strength. When the increase in replacement ratio of LP, the compressive strength of cement-based materials increased. Comparatively, the decrease in tensile strength is not significant.
Poly-lactic acid self-reinforcing composites with improved toughness utilising solid-state drawn oriented tape
Authors: Niu G L , Tao Y P , Xu W , Zhang R M , Feng X , Ren M S , Sun J L 
Published: November 2023

Abstract
With the increasing white pollution problem and the enhancement of people’s awareness of environmental protection, the bio-based and biodegradable polymers have received unprecedented attention. Poly-lactic acid (PLA) is considered as one of the most potential alternatives to petroleum-based polymer materials. However, Due to its inherent brittleness and the difficulties of post-disposal and recycling caused by traditional processing methods, PLA has not been fully accepted by the market. To overcome the issues, self-reinforcing PLA composites (SRPLA) were prepared with different PLA grades as the matrix and the reinforcement respectively. High toughness SRPLA were prepared by hot pressing using PLA3052 casting films as the matrix and PLA6202 oriented tapes fabricated by solid state drawing as the reinforcement. In addition, the toughening mechanism was analyzed. Mechanical tests showed that the strength, modulus and elongation at break were increased by 124.3%, 114% and 145.2% respectively compared with pure PLA hot pressed film. Particularly, the tensile toughness of SRPLA is more than 200% that of pure PLA. The interface debonding and tape pullout were the main toughening mechanisms.
ZrO2-doped Zn0.5Ti0.5TaO4 microwave dielectric ceramics with low dielectric loss and excellent temperature stability
Authors: Liu Kui , Zhang Huaiwu , Liu Cheng , Li Jie , Zhang Dainan , Liao Yulong 
Published: November 2023

Abstract
Herein, the weight fraction of the tri-rutile and ixiolite structures in Zn0.5Ti0.5-xZr
x
TaO4 (ZTZTO
x
, 0 ≤ x ≤ 0.10) was successfully adjusted by the substitution of Ti4+ ions by Zr4+.Zn0.5Ti>0.48Zr0.02TaO4 ceramics exhibited excellent dielectric properties when sintered at 1290°C with τ
f
= -3.73 ppm/°C, εr
= 33.22, and Q×f=79,266 GHz, respectively. As the amount of Zr4+- substitution increases, the tri-rutile structure content gradually decreases, and the tri-rutile structure is completely transformed into an ixiolite structure at 0.06 ≤x. This leads to the grain size showing a trend of decreasing and then increasing. Non-intrinsic factors suggest that ixiolite structures with lower εr
and higher Q×f values are the main cause of the change in dielectric properties. Intrinsic factors suggest that an increase in the number of Raman characteristic waves leads to a gradual decrease in εr
. The damping loss of the lattice vibrational behavior decreases, leading to a gradual increase in Q×f. In conclusion, Zn0.5Ti0.48Zr0.02TaO4 ceramics with aτf
close to zero have good prospects for application in microwave communications.
Comparison and analysis of testing methods for magnetic properties of oriented silicon steel sheets
Authors: Gu L Y , Wang X Y , Wu Y , Zhang X , Ren Y , Xue Z Y 
Published: November 2023

Abstract
The magnetic properties of oriented silicon steels with different thickness of 0.18 mm, 0.23 mm, 0.27 mm, and 0.30 mm in rolling direction and transverse direction were studied using the excitation current method and H-coil method. The magnetic field strength deviation and specific total loss of two methods were compared based on the excitation current method. The magnetic field distribution was analyzed using MagNet finite element simulation, and it was found that the measurement deviation of the excitation current method is mainly determined by the effective magnetic circuit length. The higher the magnetic flux density, the smaller the effective magnetic path length. Therefore, under low magnetic flux density conditions, the actual effective magnetic path length is greater than the specified effective magnetic path length, resulting in high measurement results, while under high magnetic flux density conditions, the measurement results are low. Due to the influence of hysteresis loss, the deviation ratio of the two methods on the total loss is generally smaller than the deviation ratio of magnetic field strength, and the 0.18mm oriented silicon steel is smaller than other thickness oriented silicon steel. Due to the difficulty of magnetization in the transverse direction of oriented silicon steel, the variation trend of magnetic field strength deviation and specific total loss along the transverse direction is significantly different from that along the rolling direction. In addition, a measurement correction strategy was proposed by determining the actual effective magnetic circuit length of the excitation current method, which achieved good results. This work has certain significance for the accurate measurement of the magnetic properties of oriented silicon steel, and is expected to provide important reference for the application of 0.18mm oriented silicon steel.
Progress in manufacturing and processing of Al-Sc alloy targets
Authors: Cao Z Q , Xiong X D , Zhang Y A , Jia Q , Cao X M , Ding Z C , Luo J F 
Published: November 2023

Abstract
The development of the fifth-generation mobile communication technology (5G) puts forward higher requirements for radio frequency (RF) filters. Due to its higher frequency and larger bandwidth, bulk acoustic wave (BAW) filter will become the mainstream RF filter solution. Scandium doped aluminium nitride (AlScN) piezoelectric film has attracted much attention due to its excellent piezoelectric response coefficients and electromechanical coupling coefficients. The doped Sc concentration will directly affect the piezoelectric coefficient and electromechanical coupling coefficient of the film. The most common technique for producing AlScN thin films is magnetron sputtering of targets made of Al-Sc alloy. However, with the increase of Sc content, the solid-liquid solidification interval, the number of intermetallic compounds, and the brittleness of the material will all increase significantly. Additionally, it will result in component macro-segregation, uneven phase distribution, and poor processing deformability. Therefore, it is extremely difficult to manufacture and process Al-Sc alloy targets. The mainstream processes for preparing Al-Sc alloy targets are divided into direct reaction method and powder metallurgy method. This paper reviews the research progress in manufacturing and processing of Al-Sc alloy targets.
Investigation on Thermal Conductivity Silver-coated Copper/GaInSn Composite Thermal Interface Materials
Authors: Zhang Jie , Sun Mingmei , Du Shijie , Xie Zhongnan , Guo Hong 
Published: November 2023

Abstract
To enhance the heat transfer performance of GaInSn liquid metal, a new type of composite thermal interface material with GaInSn as thermal conductive matrix and silver-coated copper particles as thermal conductive fillers was prepared in this article. The morphology of the composites were characterized by scanning electron microscopy. The thermal conductivity of silver-coated copper/GaInSn composites with different silver-coated copper particle contents were measured by laser flash method. The interfacial bonding of the composites were investigated by X-ray diffraction. The results show that when the volume ratio of silver-coated copper particles is 15%, thermal conductivity of the silver-coated copper/GaInSn composite reaches the largest value of 25.01 W·m−1·K−1. The silver-coated copper/GaInSn composite material and commercially available thermal grease were put into the chip and copper plate to simulate the actual application scenarios for comparison. The heat dissipation capacity of silver-coated copper/GaInSn composite material is obviously better than that of the two commercially available thermal grease, and the chip temperature can be reduced by about 5°C.
Mg4Nb2O9:Cr3+: broadband near-infrared luminescence
Authors: Yin Mei , Wang Xudong , Zhou Tianliang , Xie Rong-Jun 
Published: November 2023

Abstract
The exploration of broadband Near infrared (NIR) phosphors is one of the research priorities to enable the advancement of NIR devices. In this work, Mg4Nb2O9:Cr3+ phosphors were prepared by high-temperature solid-state reaction method. Mg4Nb2O9:Cr3+ can emit ultra-broadband NIR centred at 880 nm with an extremely full width at half maximum (FWHM) of near 200 nm, and NIR phosphor-converted LED (pc-LED) has been fabricated by combining a 450 nm blue LED with MNO:0.5%Cr to demonstrate its application prospect in night vision.