A Pressure‐Induced Inverse Order–Disorder Transition in Double Perovskites
- Institute of Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences Beijing 100190 China, Department of Chemistry and Chemical Biology Rutgers, the State University of New Jersey 610 Taylor Road Piscataway NJ 08854 USA
- Department of Physics and Astronomy Rutgers, the State University of New Jersey 136 Frelinghuysen Road Piscataway NJ 08854 USA
- Institute of Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences Beijing 100190 China
- Department of Physics New Jersey Institute of Technology Newark NJ 07102 USA
- Photon Sciences Division Brookhaven National Laboratory Upton NY 11973 USA
- Department of Chemistry and Chemical Biology Rutgers, the State University of New Jersey 610 Taylor Road Piscataway NJ 08854 USA
Abstract 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 .
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1608367
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 21 Vol. 59; ISSN 1433-7851
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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