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- W2015145158 abstract "Potassium nitrate has seven polymorphs in the pressure range to 40 kbar. The structures of the three phases obtainable at atmospheric pressure are known. Attempts to solve the structure of high pressure KNO3 phase IV by X-ray diffraction have been unsuccessful. We have now solved this structure using time-of-flight neutron powder diffraction data taken at room temperature and 3.6 kbar on the SEPD at IPNS. High pressure KNO3-IV has the same space group and point group symmetry as the low pressure KNO3-II, but with different values for lattice parameters and atomic positions. The structure of KNO3-IV is orthorhombic Pnma with a = 7.4867(2), b = 5.5648(2), and c = 6.7629(2) with four formula units per unit cell. The K, N, and one O atom are in special positions (4c) and the other O atoms are in the general position (8d) just as in the atmospheric pressure phase. The O-N-O bond angles are 120.4(1)°, and 119.3(2)°. The N-O bond lengths are 1.228(3) Å and 1.246(2) Å." @default.
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- W2015145158 date "1986-01-01" @default.
- W2015145158 modified "2023-09-28" @default.
- W2015145158 title "Structure of high-pressure KNO3-IV" @default.
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- W2015145158 doi "https://doi.org/10.1016/s0378-4363(86)80128-0" @default.
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