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arXiv 2021年

作者： Izadinia, Niloufar Ramyar, Elham Alzayer, Maytham Carr, Stephen H. Cusatis, Gianluca Dwivedi, Vidushi Garcia, Daniel J. Hettiarachchi, Missaka Massion, Thomas Miller, William M. Wächter, Andreas Department of Industrial Engineering and Management Sciences Northwestern University EvanstonIL United States Department of Civil and Environmental Engineering Northwestern University EvanstonIL United States Department of Materials Science and Engineering Northwestern University EvanstonIL United States Department of Chemical and Biological Engineering Northwestern University EvanstonIL United States Environment and Disaster Management Program World Wildlife Fund WashingtonDC United States

This paper proposes an optimization framework for sustainable post-disaster building reconstruction. Based on mathematical optimization, it is intended to provide decision makers with a versatile tool to optimize building designs and to explore the trade-off between costs and environmental impact (represented by embodied energy) of alternative building materials. The mixed-integer nonlinear optimization model includes an analytical building model that considers structural and safety constraints and incorporates regional building codes. Using multi-objective optimization concepts, Pareto-optimal designs are computed that represent the best trade-off designs from which a decision maker can choose when they take additional criteria into consideration. As a case study, we consider the design of a multi-room one-story masonry building in Nepal. We demonstrate how the framework can be employed to address a variety of questions, such as the optimal building design and material selection, the sensitivity of the decision to material prices, and the impact of regional safety regulation thresholds. © 2021, CC BY.

关键词： Economic and social effects

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Understanding, controlling and minimizing the voiding, sporadically occurring in solder joints with electroplated copper

Understanding, controlling and minimizing the voiding, spora...

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作者： Wafula, F. Liu, Y. Yin, L. Bliznakov, S. Borgesen, P. Cotts, E.J. Dimitrov, N. Department of Chemistry State University of New York at Binghamton Binghamton NY 13902-6000 United States Materials Science Program State University of New York at Binghamton Binghamton NY 13902-6000 United States Department of Systems Science and Industrial Engineering State University of New York at Binghamton Binghamton NY 13902-6000 United States Department of Physics State University of New York at Binghamton Vestal Parkway East Binghamton NY 13902-6000 United States AREA Consortium Universal Instruments Corp. PO Box 825 Binghamton NY 13902 United States

ISBN: (纸本)9781607681168

The lifetime of solder joints with electrodeposited Cu has been an issue to date as many electronic devices have shown a high drop impact failure as a result of a sporadic void formation in the intermetallic compound (IMC). At present, this problem aggravates with the introduction of Pb-free solders. It was recently found that incorporated impurities promote the voiding propensity of Cu/solder joints. The aim of this work is to quantitatively study the role of key Cu plating parameters in the impurity incorporation process. Technically emphasized herein is the plating temperature. Combining results of this study and pre-existing data, a correlation between plating rate, temperature, overpotential, and voiding propensity of accordingly deposited Cu layers is established. Ranges of overpotentials where either "void prone" or "void-free" Cu could be deposited are clearly identified in two separate acidic Cu plating solutions containing different additive combinations. The proposed analysis enables the prediction and control of the voiding propensity of solder joints with electrodeposited Cu layers. ©The Electrochemical Society.

关键词： Electrodes

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Correction to: Nucleation of voids at Li‑metal–ceramic–electrolyte interfaces

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MRS Communications 2021年第5期11卷 699-699页

作者： Raj, Rishi Materials Science and Engineering Program Department of Mechanical Engineering University of Colorado Boulder Boulder USA

This article was updated to correct the fourth paragraph in the introduction. Due to errors introduced during the production process Ω appeared as W throughout the paragraph.

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Effect of yttrium substitution on the superconducting properties of La1−xYxO0.5F0.5BiS2

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Physical Review B 2014年第5期90卷 054510-054510页

作者： I. Jeon D. Yazici B. D. White A. J. Friedman M. B. Maple Department of Physics University of California San Diego La Jolla California 92093 USA Center for Advanced Nanoscience University of California San Diego La Jolla California 92093 USA Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA

We present the effect of yttrium substitution on superconductivity in the La1−xYxO0.5F0.5BiS2 system. Polycrystalline samples with nominal Y concentrations up to 40% were synthesized and characterized via electrical resistivity, magnetic susceptibility, and specific-heat measurements. Y substitution reduces the lattice parameter a and unit-cell volume V, and a correlation between the lattice parameter c, the La-O-La bond angle, and the superconducting critical temperature Tc is observed. The chemical pressure induced by Y substitution for La produces neither the high-Tc superconducting phase nor the structural phase transition seen in LaO0.5F0.5BiS2 under externally applied pressure.

关键词： YTTRIUM LANTHANUM SUPERCONDUCTIVITY POLYCRYSTALLINE semiconductors MAGNETIC susceptibility ELECTRICAL resistivity SUPERCONDUCTING transition temperature

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Creep Constitutive Law Prediction Via Short-Term Evaluation Using a Small Size Testing Method

SSRN

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SSRN 2023年

作者： Sato, Kazuhisa Huang, Yihui Kadowaki, Moeno Nakano, Takanori Kumada, Keigo Watanabe, Satoshi Kawada, Tatsuya Akbay, Taner Graduate School of Engineering Tohoku University Sendai980-8579 Japan National Institute of Technology Gifu College Gifu501-0495 Japan Graduate School of Environmental Studies Tohoku University Sendai980-8579 Japan Materials Science and Nanotechnology Engineering Department Yeditepe University 34755 Turkey Graduate School of Engineering Tohoku University Sendai980-8579 Japan

To efficiently assess the mechanical reliability and long-term durability of solid oxide fuel cells (SOFCs) and solid oxide electrolyser cells (SOECs), a suitable creep test method and prediction of the material response is necessary. This study investigates the effectiveness of the small punch (SP) testing method for Ni–YSZ composites and in rapidly determining the constitutive creep law for SOFC materials. The creep properties of Ni–YSZ composites are evaluated under a 1% H2 environment at temperatures of 800–900 °C and stresses of 36–58 MPa. The finite element method is used to simulate the SP tests and generate numerical creep curves. These curves are fitted to the experimental curves to obtain the parameter set in the creep constitutive law of the strain hardening model. The numerical and experimental creep curves are well-fitted with only a 0.44% difference and convergent parameter sets, indicating the usefulness of the SP method and creep constitutive law for characterising and predicting the creep properties of SOFC constituent materials. This study highlights the importance of accurate characterisation of creep properties for predicting the long-term performance and reliability of SOFCs. © 2023, The Authors. All rights reserved.

关键词： Creep

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Structure and magnetic properties of Ba9V3Te15 with ferromagnetic spin chains

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Physical Review B 2023年第17期108卷 174423-174423页

作者： Jun Zhang Xinyu Zhang Yuanhua Xia Jianfa Zhao Lei Duan Guodong Wang Baosen Min Huibo Cao Clarina R. Dela Cruz Kan Zhao Hongyi Sun Jinlong Zhu Jianfeng Zhang Tao Xiang Xiancheng Wang Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physics University of Chinese Academy of Sciences Beijing 100190 China Department of Physics Southern University of Science and Technology Shenzhen 518055 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics 621999 Mianyang China Neutron Scattering Division Neutron Scattering Science Directorate Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA School of Physics Beihang University Beijing 100191 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

Here we report a ferromagnetic compound Ba9V3Te15 with quasi-one-dimensional (1D) spin chains. It was synthesized at high-temperature and high-pressure conditions and systematically investigated via structural, transport, magnetic and heat capacity measurements. Ba9V3Te15 mainly consists of trimerized face-sharing VTe6 octahedral chains running along the c axis, which are separated by a distance of 10.184(8)Å, thus demonstrating a strong 1D structural character. Ba9V3Te15 is a semiconductor with a band gap ∼128meV and undergoes a ferromagnetic transition with TC∼3.6K. Far above TC, the short-range spin orders due to the intrachain spin coupling have developed, which leads to a negative magnetoresistance effect, the deviation of magnetic susceptibility from the Curie-Weiss law and T1/2 dependence of magnetic heat capacity. Our results reveal that Ba9V3Te15 provides a good opportunity to study the intrinsic properties of a system with quasi-1D ferromagnetic spin chains.

关键词： Magnetism 1-dimensional spin chains Magnetic semiconductors

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Anharmonic effects on lattice dynamics and thermal transport of two-dimensional InTe Monolayer

arXiv

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arXiv 2022年

作者： Alqurashi, Hind Pandit, Abhiyan Hamad, Bothina Materials Science and Engineering Graduate Program University of Arkansas FayettevilleAR72701 United States Physics Department The College of Science Al Baha University Al Baha65527 Saudi Arabia Department of Physics University of Arkansas FayettevilleAR72701 United States Physics Department The University of Jordan Amman11942 Jordan

The lattice thermal conductivity (kl) plays a key role in the performance of thermoelectric (TE) materials, where the lower values lead to higher figure of merit values. Two-dimensional (2D) group III-VI monolayers such as InTe are promising materials for TE energy generation owing to their low kl that lead to high TE figure of merit values. In this work, we investigate the influence of the lattice anharmonicity on the lattice thermal conductivity of InTe monolayer. The thermodynamic parameters are calculated by using the self-consistent phonon (SCP) theory. The kl value of the InTe monolayer is obtained to be 0.30 Wm−1 K−1 by using the standard Boltzmann transport equation (BTE) approach, while it is 3.58 Wm−1 K−1 by using SCP + BTE approach. These results confirm the importance of the anharmonic effects on the kl value, where it was found to be significantly higher (91%) using the SCP + BTE approach than that obtained using the standard BTE approach. © 2022, CC BY.

关键词： Monolayers

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Pressure-induced enhancement of superconductivity and suppression of semiconducting behavior in LnO0.5F0.5BiS2 (Ln=La,Ce) compounds

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Physical Review B 2013年第6期88卷 064503-064503页

作者： C. T. Wolowiec D. Yazici B. D. White K. Huang M. B. Maple Department of Physics University of California San Diego La Jolla California 92093 USA Center for Advanced Nanoscience University of California San Diego La Jolla California 92093 USA Materials Science and Engineering Program University of California San Diego La Jolla California 92093 USA

Electrical resistivity measurements as a function of temperature between 1 and 300 K were performed at various pressures up to 3 GPa on the superconducting layered compounds LnO0.5F0.5BiS2 (Ln = La, Ce). At atmospheric pressure, LaO0.5F0.5BiS2 and CeO0.5F0.5BiS2 have superconducting critical temperatures Tc of 3.3 and 2.3 K, respectively. For both compounds, the superconducting critical temperature Tc initially increases, reaches a maximum value of 10.1 K for LaO0.5F0.5BiS2 and 6.7 K for CeO0.5F0.5BiS2, and then gradually decreases with increasing pressure. Both samples also exhibit transient behavior in the region between the lower Tc phase near atmospheric pressure and the higher Tc phase at higher pressures. This region is characterized by a broadening of the superconducting transition, in which Tc and the transition width ΔTc are reversible with increasing and decreasing pressure. There is also an appreciable pressure-induced and hysteretic suppression of semiconducting behavior up to the pressure at which the maximum value of Tc is found. At pressures above the value at which the maximum in Tc occurs, there is a gradual decrease of Tc and further suppression of the semiconducting behavior with pressure, both of which are reversible.

关键词： ELECTRICAL resistivity LANTHANUM oxide CERIUM oxides BISMUTH compounds SUPERCONDUCTING semiconductors ATMOSPHERIC pressure

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Porcelain tiles produced by the dry route

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InterCeram: International Ceramic Review 2010年第1期59卷 13-17页

作者： Melchiades, F.G. Daros, M.T. Zanelatto, F.C. Boschi, A.O. Laboratório de Revestimentos Cerâmicos - LaRC Departamento de Engenharia de Materiais - DEMa Universidade Federal de São Carlos - UFSCar São Carlos Brazil Post Graduation Program in Materials Science and Engineering - PPGCEM UFSCar São Carlos Brazil

In Brazil, 70 % of the ceramic tile output is at present produced by the dry route. Increasing global environmental concerns and the recognition of the central role played by water have pointed towards encouraging dry processes. In this context, the objective of the present work was to study the feasibility of producing high quality porcelain tiles by the dry route. A brief comparison of the dry and wet routes for producing traditional ceramic tiles shows that there are two major differences: the particle sizes obtained by the wet route are usually considerably finer and the different minerals usually mix better with the wet route. The present work studied the relative importance of these differences and looked for raw materials and operational conditions that would result in better performance and glazed porcelain tiles of good quality.

关键词： Porcelain

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Universal Law for the Elastic Moduli of Solids and Structures

arXiv

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arXiv 2020年

作者： Burns, S.J. Burns, Sean P. Materials Science Program Department of Mechanical Engineering University of Rochester RochesterNY14627-0132 United States Mesoscale and Microscale Meteorology Division National Center for Atmospheric Research 3090 Center Green Drive BoulderCO80301 United States

A law previously found for shear moduli of crystalline materials is developed and extended to all elastic moduli in solids and structures. Shear moduli were previously shown to depend only on specific volume. The bulk moduli of many materials and structures are now predicted analytically and empirically shown with unerring accuracy by observing the elasticity as a specific volume power law. The law is supported by experimental evidence from: foams, Schneebeli 2-dimensional graphene mats, metamaterials, fully dense metals, ceramics and minerals. This new, generalized, universal, elastic moduli law always describes materials that support shear stresses i.e., solids;it is shown that all elastic moduli are directly dependent only on the specific volume. Copyright © 2020, The Authors. All rights reserved.

关键词： Thermodynamics

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