Quartz / Si0 2 / GeO z / Pressure / Crystal chemistry / Crystal structuresAbstract Lattice parameters and crystal structures of the low-temperature quartz-type ('low-quartz') forms (space group P3i21) of Si0 2 and Ge0 2 were refined from single-crystal X-ray diffraction data under hydrostatic pressures up to 10.2 GPa for Si0 2 and 5.57 GPa for Ge0 2 . R W (F) values range from 2 to 5%.
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