SYNTHETIC CATISIO5 AND ITS GERMANIUM ANALOGUE (CATIGEO5)

被引：27

作者：

ROBBINS, CR

机构：

[1] National Bureau of Standards Washington, 20234, D. C

来源：

MATERIALS RESEARCH BULLETIN | 1968年 / 3卷 / 08期

关键词：

D O I：

10.1016/0025-5408(68)90119-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Synthetic, anhydrous CaTiSiO5 (sphene) and CaTiGeO5 are monoclinic with lattice constants a = 6.567 ± 0.005, b = 8.723 ± 0.005, c = 7.454 ± 0.005 A ̊, β = 119°52′ ± 2′ and a = 6.65 ± 0.01, b = 8.92 ± 0.01, c = 7.49 ± 0.01 A ̊, β = 119°45′ ± 10′ respectively. There are four formula units per cell. Cell dimensions of the silicate are close to those of natural sphene. The space group is P21 n as compared with space group C2 c reported for natural minerals of variable composition and general formula CaTiSiO4 (O,OH,F). Although x-ray intensities indicate a general structural similarity, some of the low-order (h+k odd) reflections of the synthetic crystals are fairly strong, indicating appreciable shifts from the C2 c structure. © 1968.

引用

页码：693 / &