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 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.
Original language | English (US) |
---|---|
Pages (from-to) | 8240-8246 |
Number of pages | 7 |
Journal | Angewandte Chemie - International Edition |
Volume | 59 |
Issue number | 21 |
DOIs | |
State | Published - May 18 2020 |
All Science Journal Classification (ASJC) codes
- Catalysis
- General Chemistry
Keywords
- double perovskites
- lattice compression
- magnetic frustration
- pressure-induced B-site disorder
- statistical model