Quenchable High-Pressure Polymorph of Zinc Selenate

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Science  25 Feb 1966:
Vol. 151, Issue 3713, pp. 1003
DOI: 10.1126/science.151.3713.1003


A new quenchable high-pressure form of zinc selenate (ZnSeO4) was produced by subjecting the low-pressure modification to 40 kilobars at 400°C for 30 minutes. The new form is orthorhombic, space group D2h,17-Cmcm. The cell constants at 29°C are: a, 5.511 angstroms; b, 8.110 angstroms; and c, 6.585 angstroms. The calculated density is 4.70 grams per cubic centimeter in comparison with 4.61 grams per cubic centimeter for the low-pressure modification. This implies a volume change of 2 percent at the transition.