In the present work, ternary Special Quasirandom Structures (SQSs) for a fcc solid solution phase are generated at different compositions, $x_A=x_B=x_C=\tfrac{1}{3}$ and $x_A=\tfrac{1}{2}$, $x_B=x_C=\tfrac{1}{4}$, whose correlation functions are satisfactorily close to those of a random fcc solution. The generated SQSs are used to calculate the mixing enthalpy of the fcc phase in the Ca-Sr-Yb system. It is observed that first-principles calculations of all the binary and ternary SQSs in the Ca-Sr-Yb system exhibit very small local relaxation. It is concluded that the fcc ternary SQSs can provide valuable information about the mixing behavior of the fcc ternary solid solution phase. The SQSs presented in this work can be widely used to study the behavior of ternary fcc solid solutions.
Hybrid-Functional Calculations of Electronic Structure and Phase Stability of MO (M = Zn, Cd, Be, Mg, Ca, Sr, Ba) and Related Ternary Alloy M$_x$Zn$_{1-x}$O
Orbital fingerprinting of magnetism across the Mn-Ni-Ga Heusler ternary
Federal University of Parana(巴拉那联邦大学);Interdisciplinary Center for Science, Technology, and Innovation (CICTI), Federal University of Parana(巴拉那联邦大学跨学科科学技术与创新中心);Imperial College London(帝国理工学院);University of São Paulo(圣保罗大学);University of Brasília, Institute of Physics(巴西利亚大学物理研究所);Zuse Institute Berlin (ZIB)(柏林祖斯研究所)
Thermodynamic Stability of Mg-based Ternary Long-Period Stacking Ordered Structures
含有长周期堆垛有序(LPSO)结构的镁合金具有非常高的拉伸屈服强度和塑性。它们存在于各种三元Mg体系中,一般形式为Mg-XL-XS,其中XL和XS分别是大于和小于Mg的元素。在这项工作中,我们研究了这些LPSO沉淀物的热力学稳定性与密度泛函理论,使用一个新提出的结构模型的基础上列入一个Mg间隙原子。我们预测了许多Mg-XL-XS三元体系的14 H和18 R LPSO结构的稳定性:85个体系由XL=稀土(RE)Sc,Y,La-Lu和XS=Zn,Al,Cu,Co,Ni组成。我们预测在所有系统中观察到LPSO结构的稳定LPSO阶段。此外,我们预测了几个稳定的LPSO结构在新的,尚未观察到的Mg-RE-XS系统。根据Mg和XL的尺寸失配,还探索了许多非稀土XL元素,包括Tl、Sb、Pb、Na、Te、Bi、Pa、Ca、Th、K、Sr等55个三元系。XL=Ca、Sr和Th被预测为最有希望形成稳定的LPSO相,特别是XS=Zn。最后,几个以前观察到的已知XL元素之间的趋势进行检查。我们发现,有利的混合能量之间的Mg和XL的FCC晶格和尺寸失配一起作为优秀的标准确定XL LPSO形成。
Data-Driven Prediction of NaCl-Type Entropy-Stabilized Oxide Compositions from First-Principles and Supervised Learning
Univ Paris Est Creteil, CNRS, ICMPE(巴黎东克雷泰伊大学,法国国家科学研究中心,分子化学与材料研究所);Université Paris-Saclay, CNRS, Institut de chimie moléculaire et des matériaux d’Orsay(巴黎萨克雷大学,法国国家科学研究中心,奥赛分子化学与材料研究所)