Structural stability and polymorphic phase transitions in barium zirconium diorthophosphate, a technologically important compound consisting of the polyhedral framework structure, has been studied under high pressure (HP). With the combined study of x-ray diffraction (up to ∼12 GPa) and Raman spectroscopy at high pressure (up to ∼16 GPa), we observed three reversible pressure induced polymorphic phase transitions. The ambient phase transforms at a very low pressure (0.4 GPa) to a triclinic structure (HP-1 phase). Ambient and HP-1 phases coexist up to ∼2 GPa before transforming to the monoclinic HP-2 phase. Further, another transition is observed around ∼8 GPa (HP-3). On complete release of pressure, the sample reverts to the ambient phase with traces of the HP-1 phase. First principles based phonon and structural relaxation calculations are used to compare experimental findings. This study establishes a polymorphic structural sequence in yavapaiite type compounds.
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7 April 2020
Research Article|
April 01 2020
Pressure induced phase transitions in BaZr(PO4)2 studied using x-ray diffraction, Raman spectroscopy, and first principles calculations
Meera Varma
;
Meera Varma
1
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre
, Mumbai 400085, India
2
Department of Physics, University of Mumbai
, Mahatma Gandhi Road, Kala Ghoda, Fort, Mumbai 400032, India
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H. K. Poswal
;
H. K. Poswal
a)
1
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre
, Mumbai 400085, India
a)Author to whom correspondence should be addressed: himanshu@barc.gov.in
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Srihari Velaga
Srihari Velaga
1
High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre
, Mumbai 400085, India
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a)Author to whom correspondence should be addressed: himanshu@barc.gov.in
J. Appl. Phys. 127, 135902 (2020)
Article history
Received:
January 14 2020
Accepted:
March 12 2020
Citation
Meera Varma, H. K. Poswal, Srihari Velaga; Pressure induced phase transitions in BaZr(PO4)2 studied using x-ray diffraction, Raman spectroscopy, and first principles calculations. J. Appl. Phys. 7 April 2020; 127 (13): 135902. https://doi.org/10.1063/1.5144958
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