Abstract
The characteristics of crystal structures of the titanium(IV) diammonium (Ti(NH4)2P4O13) and tin(IV) diammonium (Sn(NH4)2P4O13) tetraphosphates, which are isostructural with similar silicon(IV) and germanium(IV) salts, have been obtained by the Rietveld method using X-ray powder diffraction data. The compounds crystallize in the triclinic system, space group P \(\overline 1 \), Z = 2, a = 15.0291(7) Å, b = 7.9236(4) Å, c = 5.0754(3) Å, α = 99.168(3)°, β = 97.059(3)°, γ = 83.459(3)° for Ti(NH4)2P4O13 and a = 15.1454(7) Å, b = 8.0103(5) Å, c = 5.1053(3) Å, α = 99.898(6)°, β = 96.806(3)°, γ = 83.881(4)° for Sn(NH4)2P4O13. The structure is refined in the isotropic approximation using the pseudo-Voigt function: R p = 0.077, R Bragg = 0.045, R F = 0.057 for Ti(NH4)2P4O13; R p = 0.082, R Bragg = 0.044, R F = 0.046 for Sn(NH4)2P4O13. The hydrogen atoms of the ammonium cations are placed in the calculated positions. A comparative analysis of the structures of the compounds of the MIV(NH4)2P4O13 (MIV = Si, Ge, Ti, Sn) series has been carried out.
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Original Russian Text © L.S. Ivashkevich, A.F. Selevich, A.S. Lyakhov, A.I. Lesnikovich, 2007, published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 8, pp. 1359–1364.
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Ivashkevich, L.S., Selevich, A.F., Lyakhov, A.S. et al. Crystal structures of Ti(NH4)2P4O13 and Sn(NH4)2P4O13 . Russ. J. Inorg. Chem. 52, 1274–1279 (2007). https://doi.org/10.1134/S0036023607080189
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DOI: https://doi.org/10.1134/S0036023607080189