High pressure study of phase transitions in α-FePO4

Murli, Chitra ; Sharma, Surinder M. ; Kulshreshtha, S. K. ; Sikka, S. K. (1997) High pressure study of phase transitions in α-FePO4 Pramana - Journal of Physics, 49 (3). pp. 285-291. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/49/3/285-29...

Related URL: http://dx.doi.org/10.1007/BF02875204


High pressure behaviour of FePO4in berlinite form has been investigated up to 10 GPa using vibrational Raman spectroscopy and energy dispersive X-ray diffraction. Combination of these techniques along with studies on pressure quenched samples reveal structural transitions in this material from its room pressure trigonal phase to a disordered and a crystalline phase near 3±0.5 GPa. The latter is the Cmcm phase which is the equilibrium structure at high pressures. These high pressure phases do not revert back to its initial structure after release of pressure. Irreversibility of these transformations indicates that FeO4 tetrahedra do not regain their initial coordination. These high pressure transitions can be rationalized in terms of the three level free energy diagram for such systems.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:α-FePO4; Phase Transition; X-ray Diffraction; Raman Scattering
ID Code:48166
Deposited On:13 Jul 2011 14:22
Last Modified:18 May 2016 03:28

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