Pressure-induced Phase Transition in BaCrO4
BaCrO{sub 4} was studied to 25 GPa in a diamond-anvil cell using both Raman spectroscopy and x-ray diffraction methods. Our results showed that BaCrO{sub 4} exhibits a phase transition near 9 GPa from both Raman and x-ray diffraction measurements. The new high-pressure phase (BaCrO{sub 4}-II) is suggested as a monoclinic (P2{sub 1}/m) structure, different from other high-pressure forms of ABO{sub 4}-type compounds. Moreover, the high-pressure phase of BaCrO{sub 4} is found to be reversible; the low-pressure phase is recovered at -8 GPa upon decompression. The pressure-volume data of BaCrO{sub 4} fitted to a third-order Birch-Murnaghan equation of state yield a bulk modulus of 53(1) GPa and a pressure derivative of 6.8(5), in agreement with the theoretical prediction. For the high-pressure phase BaCrO{sub 4}-II, the bulk modulus is 117(10) GPa and the pressure derivative is 3(1).
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- DOE - OFFICE OF SCIENCE
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1020044
- Report Number(s):
- BNL-95891-2011-JA; TRN: US201116%%28
- Journal Information:
- Physical Review B: Condensed Matter and Materials Physics, Vol. 81, Issue 21; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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