首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >A modulation wave approach to the structural characterization of three new cristobalite-related sodium magnesiosilicates
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A modulation wave approach to the structural characterization of three new cristobalite-related sodium magnesiosilicates

机译:调制波方法对三种新型方英石相关镁硅酸钠的结构表征

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The crystal structures of three new cristobalite-related sodium magnesiosilicates [Na2MgSiO4, M-r = 162.37, orthorhombic, Pna2(1), a = 10.835 (5), b = 5.279 (12), c = 7.067 (8) Angstrom, D-x = 2.668 g cm(-3), Z = 4, Cu K alpha, lambda = 1.5418 Angstrom, mu = 75.96 cm(-1), F(000) = 319.87; Na1.74Mg0.79Al0.15Si1.06O4, M-r = 157.02, orthorhombic, Pbca, a = 10.487 (7), b = 14.351 (4), c = 5.243 (6) Angstrom, D-x = 2.643 g cm(-3), Z = 8, Cu K alpha, lambda = 1.5418 Angstrom, mu = 76.70 cm(-1), F(000) = 619.04; Na1.8Mg0.9Si1.1O4, M-r = 158.15, tetragonal, P4(1)2(1)2, a = 5.330(6), c = 7.086 (5) Angstrom, D-x = 2.609 g cm(-3), Z = 2, Cu K alpha, lambda = 1.5418 Angstrom, mu = 75.44 cm(-1), F(000) = 155.94] are determined by Rietveld refinement from X-ray powder diffraction data. Plausible starting models were derived from a modulation wave approach based on the ideal C9 structure type and assuming regular SiO4 and MgO4 tetrahedra.
机译:三种新型方英石相关的镁硅酸钠(Na2MgSiO4,Mr = 162.37,斜方晶系,Pna2(1),a = 10.835(5),b = 5.279(12),c = 7.067(8)埃,Dx = 2.668 g cm(-3),Z = 4,Cu K alpha,λ= 1.5418埃,mu = 75.96 cm(-1),F(000)= 319.87; Na1.74Mg0.79Al0.15Si1.06O4,Mr = 157.02,正交晶,Pbca,a = 10.487(7),b = 14.351(4),c = 5.243(6)埃,Dx = 2.643 g cm(-3), Z = 8,Cu Kα,λ= 1.5418埃,mu = 76.70 cm(-1),F(000)= 619.04; Na1.8Mg0.9Si1.1O4,Mr = 158.15,四方,P4(1)2(1)2,a = 5.330(6),c = 7.086(5)埃,Dx = 2.609 g cm(-3),Z通过X射线粉末衍射数据的Rietveld精炼确定了Cu = 2,Cu Kα,λ= 1.5418埃,mu = 75.44 cm(-1),F(000)= 155.94]。合理的初始模型是从基于理想C9结构类型并假设规则SiO4和MgO4四面体的调制波方法得出的。

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