A Pressure-Induced Inverse Order-Disorder Transition in Double Perovskites

被引：23

作者：

Deng, Zheng ^{[1
,2
,3
]}

Kang, Chang-Jong ^{[4
]}

Croft, Mark ^{[4
]}

Li, Wenmin ^{[1
,2
]}

Shen, Xi ^{[1
,2
]}

Zhao, Jianfa ^{[1
,2
]}

Yu, Richeng ^{[1
,2
]}

Jin, Changqing ^{[1
,2
]}

Kotliar, Gabriel ^{[4
]}

Liu, Sizhan ^{[5
]}

Tyson, Trevor A. ^{[5
]}

Tappero, Ryan ^{[6
]}

Greenblatt, Martha ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys, Beijing 100190, Peoples R China

[3] Rutgers State Univ, Dept Chem & Chem Biol, 610 Taylor Rd, Piscataway, NJ 08854 USA

[4] Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA

[5] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA

[6] Brookhaven Natl Lab, Photon Sci Div, Upton, NY 11973 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2020年 / 59卷 / 21期

关键词：

double perovskites; lattice compression; magnetic frustration; pressure-induced B-site disorder; statistical model; PHASE-TRANSITION; B-CATIONS; THERMODYNAMICS;

D O I：

10.1002/anie.202001922

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Given the consensus that pressure improves cation ordering in most of known materials, a discovery of pressure-induced disordering could require recognition of an order-disorder transition in solid-state physics/chemistry and geophysics. Double perovskites Y2CoIrO6 and Y2CoRuO6 polymorphs synthesized at 0, 6, and 15 GPa show B-site ordering, partial ordering, and disordering, respectively, accompanied by lattice compression and crystal structure alteration from monoclinic to orthorhombic symmetry. Correspondingly, the long-range ferrimagnetic ordering in the B-site ordered samples are gradually overwhelmed by B-site disorder. Theoretical calculations suggest that unusual unit-cell compressions under external pressures unexpectedly stabilize the disordered phases of Y2CoIrO6 and Y2CoRuO6.

引用

页码：8240 / 8246

页数：7

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