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Amorphization of Ca3(VO4)2at High Pressure

✍ Scribed by Andrzej Grzechnik

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
307 KB
Volume
139
Category
Article
ISSN
0022-4596

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✦ Synopsis

The combined X-ray diffraction and Raman spectroscopy data show that Ca 3 (VO 4 ) 2 irreversibly amorphizes at 10.0 GPa and room temperature. The amorphization, with its onset at about 8.5 GPa, is not preceded by any phase transition in the crystalline phase, which possesses highly anisotropic compressibility (the axial stiffness along the a axis is over 30% larger than the axial stiffness along the c axis). The results of Raman spectroscopy measurements demonstrate that structural rearrangements in the amorphous Ca 3 (VO 4 ) 2 occur between 8.1 and 14.8 GPa. This is associated with a large deformation of the VO 3؊ 4 units or the increase of the average coordination number for the V 5Ψ‰ cations in the amorphous material. A large hysteresis of this phase change is observed upon decompression, suggesting a firstorder character of polymorphic transitions within the amorphous material.

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