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The crystal structure of the low-temperature form of K 3 PO 4 has been determined for the first time using neutron diffraction (Rietveld method) and Raman spectroscopy: orthorhombic cell (sp. gr. Pnma, Z = 4), lattice parameters a = 1.12377(2) nm, b = 0.81046(1) nm, c = 0.59227(1) nm. The structure is made up of isolated [PO 4 ] tetrahedra, with the potassium ions in between.
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Воронин et al. (2006) studied this question.
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