نتایج جستجو برای: cristobalite
تعداد نتایج: 356 فیلتر نتایج به سال:
Structural and volume compressibility data for two a cristobalite samples were determined by single-crystal X-ray diffraction methods at pressures up to -1.6 GPa. As with the other silica polymorphs that have been studied at high pressure, the change of the SiO-Si angle is correlated with the volume compressibility. The Si-O bond lengths and the O-Si-O angles remain essentially unchanged. The b...
The aim of this research is to investigate different X-ray based quantitative phase analysis methods for determination of cristobalite phase content in ceramic cores. For this purpose, four popular routes including peak absolute intensity method, relative intensity ratio method, direct or calibration method and internal standard (or Alexander-Klug) method have been chosen. Some control samples ...
Gallium boron phosphate, (Ga(0.71)B(0.29))PO(4), was synthesized by a high-temperature solid-state reaction method. The crystal structure is isostructural with the tetra-gonal high-cristobalite structure with space group P which is built from alternating Ga(B)O(4) and PO(4) tetra-hedra inter-connected by sharing the common O-atom vertices, resulting in a three-dimensional structure with two-dim...
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