Study of the structure of synthetic opals affected by temperature and pressure
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It is demonstrated that synthetic opals, like most natural ones, have a cristobalite rather than quartz basis, change their color from white to blue after losing their water-containing component, and form superlattices. Being affected by temperature and pressure, they undergo partial or complete crystallization to the corresponding polymorphic modifications.
KeywordsPhotonic Crystal Crystallography Report Cristobalite Tridymite Neutron Diffraction Pattern
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