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Crystal Structure of Niobium-Rich Lomonosovite with Symmetry P 1 from the Khibiny Massif (Kola Peninsula)
Crystallography Reports ( IF 0.7 ) Pub Date : 2020-05-27 , DOI: 10.1134/s1063774520030268 R. K. Rastsvetaeva , V. A. Zaitsev , I. V. Pekov
中文翻译:
Khibiny地块(可乐半岛)中富含对称性P 1的富铌菱锰矿的晶体结构
更新日期:2020-05-27
Crystallography Reports ( IF 0.7 ) Pub Date : 2020-05-27 , DOI: 10.1134/s1063774520030268 R. K. Rastsvetaeva , V. A. Zaitsev , I. V. Pekov
Abstract
A new niobium-rich lomonosovite variety with a high degree of ordering of Ti and Nb atoms has been investigated by X-ray diffraction analysis and electron probe microanalysis. Its simplified formula is Na10Ti2(Nb,Fe,Ti)2(Si2O7)2(PO4)2O4. The triclinic unit-cell parameters are a = 5.411(1) Å, b = 7.108(1) Å, c = 14.477(2) Å, α = 99.78(1)°, β = 96.59(1)°, γ = 90.26(1)°, V = 544.94(5) Å3, Z = 1, sp. gr. P1. The crystal structure has been refined to the final reliability factor R = 6.3% within the anisotropic approximation of atomic displacements using 3674 reflections with F > 3σ(F). The problem of niobium distribution in minerals with structures of lomonosovite and related types is discussed.中文翻译:
Khibiny地块(可乐半岛)中富含对称性P 1的富铌菱锰矿的晶体结构