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A Pressure‐Induced Inverse Order–Disorder Transition in Double Perovskites
Author(s) -
Deng Zheng,
Kang ChangJong,
Croft Mark,
Li Wenmin,
Shen Xi,
Zhao Jianfa,
Yu Richeng,
Jin Changqing,
Kotliar Gabriel,
Liu Sizhan,
Tyson Trevor A.,
Tappero Ryan,
Greenblatt Martha
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202001922
Subject(s) - orthorhombic crystal system , monoclinic crystal system , ferrimagnetism , crystal structure , lattice (music) , crystallography , crystal structure prediction , condensed matter physics , high pressure , inverse , chemistry , materials science , physics , thermodynamics , magnetization , mathematics , quantum mechanics , magnetic field , acoustics , geometry
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 Y 2 CoIrO 6 and Y 2 CoRuO 6 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 Y 2 CoIrO 6 and Y 2 CoRuO 6 .