High-pressure Raman and optical absorption studies on lead pyroniobate (Pb2Nb2O7) and pressure-induced phase transitions

Jayaraman, A. ; Kourouklis, G. A. ; Cooper, A. S. ; Espinosa, G. P. (1990) High-pressure Raman and optical absorption studies on lead pyroniobate (Pb2Nb2O7) and pressure-induced phase transitions Journal of Physical Chemistry, 94 (3). pp. 1091-1094. ISSN 0022-3654

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100366a013

Related URL: http://dx.doi.org/10.1021/j100366a013

Abstract

High-pressure Raman scattering and optical absorption studies have been carried out on lead pyroniobate up to 33 GPa, using a gasketed diamond anvil cell. The Raman study reveals the occurrence of two, possibly three, pressure-induced phase changes; a rather subtle change is indicated near 4.5 GPa. The transition near 13 GPa is attributed to a structural transition from the rhombohedral to the cubic pyrochlore structure. The third phase change occurs near 20 GPa. From the broad Raman feature that is observed at about 800 cm-1, it is concluded that the system turns amorphous at pressures above 20 GPa. The amorphous phase recrystallizes to the original rhombohedral phase, on release of pressure.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:13281
Deposited On:11 Nov 2010 08:13
Last Modified:06 Jun 2011 05:31

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