New Polymorph of Si02 Formed under Quasi-Hydrostatic Compression of Cristobalite

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  • New Polymorph of SiO2 Formed under Quasi-Hydrostatic Compression of Cristobalite.
  • New Polymorph of Si02 Formed under Quas

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High pressure in situ x-ray observations of silica (cristobalite) clarified very large effect of non-hydrostaticity on the crystal structure of high pressure polymorph and the apparent compressibility. Under quasi-hydrostatic compression, cristobalite transformed to a new polymorph, which gives very similar diffraction profile to that of stishovite, while under strongly non-hydrostatic compression, a completely different phase named "X-I" was formed. Very different compression curves of cristobalite were observed, depending on the hydrostaticity of applied pressure, which is well explained using the elastic theory.

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