Experimental invalidation of phase-transition-induced elastic softening in CrN

被引：50

作者：

Wang, Shanmin ^{[1
,2
]}

Yu, Xiaohui ^{[2
]}

Zhang, Jianzhong ^{[2
]}

Chen, Miao ^{[1
]}

Zhu, Jinlong ^{[2
]}

Wang, Liping ^{[3
]}

He, Duanwei ^{[1
]}

Lin, Zhijun ^{[2
]}

Zhang, Ruifeng ^{[4
]}

Leinenweber, Kurt ^{[5
]}

Zhao, Yusheng ^{[2
,3
]}

机构：

[1] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Peoples R China

[2] Los Alamos Natl Lab, LANSCE Div, Los Alamos, NM 87545 USA

[3] Univ Nevada, HiPSEC, Las Vegas, NV 89154 USA

[4] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[5] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 06期

基金：

中国国家自然科学基金;

关键词：

BULK MODULUS; QUESTIONABLE COLLAPSE; HIGH-PRESSURE; MAGNESIOWUSTITE; POSTPEROVSKITE; PEROVSKITE; EQUATION; MANTLE; STATE; IRON;

D O I：

10.1103/PhysRevB.86.064111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report experimental results of phase stability and incompressibility of CrN. The obtained bulk moduli for cubic and orthorhombic CrN are 257 and 262 GPa, respectively. These results invalidate the conclusion of phase-transition-induced elastic softening recently reported based on nonmagnetic simulations for cubic CrN [Nature Mater. 8, 947 (2009)]. On the other hand, they provide the only experimental evidence to support the computational models involving the local magnetic moment of Cr atoms [Nature Mater. 9, 283 (2010)], indicating that atomic spin has a profound influence on the material's elastic properties. We also demonstrate that nonstoichiometry in CrNx has strong effects on its structural stability.

引用

页数：4

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