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Synthesis and characteristics of transparent Gd_(2)O_(3)ceramics with cubic structure

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Journal of Advanced Ceramics 2024年第4期13卷 463-468页

作者： Akio Ikesue Yan Lin Aung World Lab Co. Nagoya456-8587Japan

Transparent Gd_(2)O_(3)ceramics with a cubic crystal structure were successfully synthesized for the first time.The Gd_(2)O_(3)ceramics subjected to hot isostatic press(HIP)at 1070℃consisted of uniform grains of 2-3μm,and only a few residual pores could be detected inside the materials.X-ray diffraction(XRD)shows that the obtained polycrystalline materials have a cubic crystal structure,and the transmission polarized light observation shows that there is no birefringence inside the materials,indicating inherent optical properties of the cubic crystal structure.The optical absorption edge is 640 nm(optical band gap:2.1 eV),and the transmittance in the visible to near-infrared region is 72%,which is close to the theoretical transmittance calculated from Fresnel loss.Verdet constant of this material is almost wavelength-independent,and it is diamagnetic since it has the opposite polarity to that of common paramagnetic materials.

关键词： gadolinium oxide cubic hot isostatic press(HiP) diamagnetic Verdet constant

Effect of Size and Initial Water Content on the Effective Diffusion Coefficient during Convective Drying of Sweet Potato Cut into cubic and Cylindrical Shapes

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Journal of Materials Science and Chemical Engineering 2024年第6期12卷 71-82页

作者： Ibrango Abdoul Salam Ouoba Kondia Honoré Bama Désiré Traoré Yssa Zongo Karim Ouedraogo Salifou Laboratoire de Matriaux de lHliophysique et Environnement (La.M.H.E.) Unit de Formation et de Recherche en Sciences. Exactes et Appliques (UFR/SEA) Universit Nazi BONI de Bobo-Dioulasso Bobo-Dioulasso Burkina Faso

In this article, we investigated the influence of size and initial water content on the effective diffusion coefficient of sweet potatoes samples cut into cubic and cylindrical shapes. The sizes of the cubic samples are 0.5, 1, 1.5, 1.75, 2, 2.5 and 3 cm edge with a respective initial water content of 2.7, 3.76, 3.48, 2.68, 3.28, 2.17 and 2.29 kg/kgms. For cylindrical samples, the radius is set at 0.5 cm and sample heights are 1, 1.5, 2, 2.5, 3, 3.5 and 4 cm with respective water contents of 2.2, 3.19, 2.85, 2.1, 2.17, 2.39 and 2.03 kg/kgms. The effective diffusion coefficients of cubic samples are of the order of 10−10 and 10−9 m2∙s−1 grew with sample edge. As for the cylindrical samples, the effective diffusion coefficients were of the order of 10−9 m2∙s−1 and there was no linear correlation between cylinder height and their effective diffusion coefficient. As for the examination of the initial water content on the effective diffusion coefficient, it turned out that the initial water content had no influence on the effective diffusion coefficient of the sweet potato samples.

关键词： Effective Diffusion Coefficient Initial Water Content Sweet Potato cubic Cylindrical

An AI-driven microstructure optimization framework for elastic properties of titanium beyond cubic crystal systems

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npj Computational Materials 2023年第1期9卷 1217-1226页

作者： Yuwei Mao Mahmudul Hasan Arindam Paul Vishu Gupta Kamal Choudhary Francesca Tavazza Wei-keng Liao Alok Choudhary Pinar Acar Ankit Agrawal Department of Electrical and Computer Engineering Northwestern UniversityEvanstonILUSA Virginia Tech BlacksburgVAUSA Materials Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA Theiss Research La JollaCA 92037USA

Materials design aims to identify the material features that provide optimal properties for various engineering applications,such as aerospace,automotive,and naval.One of the important but challenging problems for materials design is to discover multiple polycrystalline microstructures with optimal properties.This paper proposes an end-to-end artificial intelligence(AI)-driven microstructure optimization framework for elastic properties of materials.In this work,the microstructure is represented by the Orientation Distribution Function(ODF)that determines the volume densities of crystallographic orientations.The framework was evaluated on two crystal systems,cubic and hexagonal,for Titanium(Ti)in Joint Automated Repository for Various Integrated Simulations(JARVIS)database and is expected to be widely applicable for materials with multiple crystal systems.The proposed framework can discover multiple polycrystalline microstructures without compromising the optimal property values and saving significant computational time.

关键词： microstructure cubic crystal

Deformation twinning in octahe dron-base d face-centere d cubic metallic structures:Localized shear-force dipoles drive atomic displacements

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Journal of Materials Science & Technology 2022年第31期126卷 116-126页

作者： Hengfei Gu Chengze Liu Fusen Yuan Fuzhou Han Yingdong Zhang Muhammad Ali Wenbin Guo Jie Ren Lifeng Zhang Songquan Wu Geping Li Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China University of Science and Technology of China Hefei 230026China Institute of Molecular Plus Tianjin UniversityTianjin 300072China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Twinning is found to impart favorable mechanical,physical and chemical properties to nanostructured materials.Deformation twinning prevails in face-centered cubic(FCC)nanocrystalline materials upon loading.In FCC structures,the{111}deformation twinning is traditionally believed to nucleate and grow through layer-by-layer emission of 1/6Shockley partial dislocations on consecutive{111}planes.We report that deformation twinning is able to occur in crystalline(Fe,Nb)_(23)Zr_(6)nanoparticles(NPs)that have a large Mn 23 Th 6-type FCC structure with a Zr-octahedron as a motif.Based on direct atomic-scale observations,we discover a new zero-net-strain path for the{111}deformation twin-ning in FCC structures.To form a[¯1¯12]/(111)twin,for example,short(¯1¯11)planes within two adjacent(111)plane layers in the repeated three-layer sequence of(111)planes are shear deformed continuously by a shear-force dipole along the[11¯2]direction like a domino effect,whereas the other(111)plane in the repeated sequence remains intact.In addition,a loading criterion for deformation twinning of a FCC NP under uniaxial compression is proposed based on our observations.Our work here not only extends the fundamental understanding on deformation twinning in FCC structures,but also opens up studies of deformation behaviors in a class of Mn 23 Th 6-type FCC materials.

关键词： deformation cubic dipole

Synergistic effect of cubic C_(3)N_(4)/ZnO/C hybrid composite for selective detection of sulfur dioxide

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Rare Metals 2022年第11期41卷 3662-3670页

作者： Xin-Jia Miao Xiao-Jun Zhao Hao Qin Qi Jin Yang Chen Zong-Qiang Cao Wei-Ting Yang Qing-Ji Wang Qin-He Pan Key Laboratory of Advanced Materials of Tropical Island Resources Ministry of EducationSchool of ScienceHainan UniversityHaikou570228China School of Chemical Engineering and Technology Hainan UniversityHaikou570228China State Key Laboratory of Marine Resource Utilization in South China Sea College of Information and Communication EngineeringHainan UniversityHaikou570228China

With the development of industrial society,the emission of SO_(2) gas increases sharply.Because of the harm of SO_(2) to the environment and human health,it is crucial to detect and capture SO_(2),especially to develop gas sensing materials with good selectivity and durability to SO_(2).In this work,we prepared a C_(3)N_(4)/ZnO/C hybrid,MFM@IRMOF-3-T,for SO_(2) monitoring by annealing a composite of melamine-formaldehyde resin microsphere (MFM) and isoreticular metal-organic frameworks (IRMOF)-3.

关键词： composite O/C cubic

Treasure Trees on Barren Land

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ChinAfrica 2024年第4期16卷 48-49页

作者： XIA YUANYUAN Ordos City

As the Spring Festival draws near,Desheng Youliang Village in Nuanshui Township,Jungar Banner in Ordos City of north China’s Inner Mongolia Autonomous Region,enters a new round of apple sales.In the 2,000 cubic meter... 详细信息

关键词： Banner packing cubic

cubic Auto-Catalysis Reactions in Three-Dimensional Nanofluid Flow Considering Viscous and Joule Dissipations Under Thermal Jump

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Communications in Theoretical Physics 2019年第7期71卷 779-792页

作者： Rakesh Kumar Ravinder Kumar Reena Koundal Sabir Ali Shehzad Mohsen Sheikholeslami Department of Mathematics Central University of Himachal PradeshDharamshalaIndia Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran

In this problem,simultaneous effects of Joule and viscous dissipation in three-dimensional flow of nanoliquid have been addressed in slip flow regime under time dependent rotational oscillations.Silver nanoparticles are submerged in the base fluid(water)due to their chemical and biological features.To increment the novelty,effects of cubic autocatalysis chemical reactions and radiative heat transfer have been incorporated in the related boundary layer equations.Dimensionless partial differential system is solved by employing the proposed implicit finite difference approach.Convergence conditions and stability criteria are obtained to ensure the convergence and accuracy of solutions.A comparative analysis is proposed for no-slip nanofluid flow(NSNF)and slip nanofluid flow(SNF).Variations in skin-friction coefficients,Sherwood and Nusselt numbers against physical parameters are tabulated.It is investigated that velocity slip and temperature jump significantly control drag forces and rate of heat transfer.

关键词： cubic autocatalysis reactions viscous dissipation Joule heating rotating-fluctuating environment slip flow regime

cubic Ice Captured by In Situ Transmission Electron Microscope

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中国物理快报:英文版 2023年第5期40卷 19-19页

作者：王立芬 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Nearly a hundred years ago,the Nobel laureate Linus Pauling proposed based on the'ice rule'[1]and residual entropy theory that the structural entropy of ice is the same for common hexagonal ice(Ih)with tetrahedrally coordinated water molecules assembling into a hexagonal close-packing manner and cubic ice(ice Ic)in a cubic closepacking manner.[2]

关键词： hexagonal cubic entropy

Wet Mechanical Milling Induced Phase Transition to cubic Anti-Perovskite Li_(2)OHCl

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Chinese Physics Letters 2022年第2期39卷 78-81页

作者：倪地兴刘耀东邓志陈典诚张欣欣王涛李帅赵予生 Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China 21C Innovation Laboratory Contemporary Amperex Technology Ltd.(CATL)Ningde 352100China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan 523803China

Anti-perovskite solid-state electrolyte Li_(2)OHCl usually exhibits orthorhombic phase and low ionic conductivity at room temperature.However,its ionic conductivity increases greatly when the temperature is up to 40℃,while it goes through an orthorhombic-to-cubic phase transition.The cubic Li_(2)OHCl with high ionic conductivity is stabilized at room temperature and even lower temperature about 10℃ by a simple synthesis method of wet mechanical milling.The cubic Li_(2)OHCl prepared by this method performs an ionic conductivity of 4.27×10^(-6) S/cm at room temperature,about one order of magnitude higher than that of the orthorhombic Li_(2)OHCl.The phase-transition temperature is decreased to around 10℃.Moreover,it can still remain cubic phase after heat treatment at 210℃.This work delivers a huge potential of fabricating high ionic conductivity phase antiperovskite solid-state electrolyte materials by wet mechanical milling.

关键词： temperature transition cubic