X-ray powder diffraction patterns and phase relationship of tridymite modifications
X-ray powder diffraction patterns and phase relationship of tridymite modifications
复制标题
鳞石英变体的X射线粉末衍射图谱和相关系
DOI：
10.1524/zkri.1991.195.14.31
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
O. W. Flörke
中科院分区：
文献类型：
--
作者：
H. Graetsch;O. W. Flörke
Calculated and observed X-ray powder patterns of three ambient temperature modifications of tridymite: L1-T O (=ordered low-tridymite MC), L2-T D (=disordered low-tridymite PO 5/10 ) and L3-T o (=ordered low-tridymite MX-1) are reported. Deviations in the diffractograms due to texture effect, stacking disorder and intergrowth of different modifications which complicate identification and indexing are discussed. Changes of unit cell dimensions due to thermal expansion and phase transitions were measured from room temperature to about 700 o C. Near 160 o C all ordered and slightly disordered tridymite polymorphs transform to monoclinic high tridymite H3-T (OS) with non-integral modulation, at about 210 o C to orthorhombic high tridymite H2-T (OC) and finally at about 400 o C to hexagonal high-tridymite H1-T (HP)
