Transformation mechanism between high‐quartz and keatite phases of LiAlSi2O6 compositon
Transformation mechanism between high‐quartz and keatite phases of LiAlSi2O6 compositon
复制标题
LiAlSi2O6复合材料高石英相与热钙石相的转变机理
DOI：
--
复制
发表时间：
1971
期刊：
影响因子：
--
通讯作者：
C.
中科院分区：
文献类型：
--
作者：
C.
LiAlSi 2 O 6组合物的高石英相在升高的温度下重建地转变成热液岩相。转换矩阵首先从粉末数据导出，然后由单晶数据确认。(Si A1）-四面体在高石英相中形成六元环和八元环，而在热液岩相中形成五元环、七元环和八元环。所有的六元环和一半的八元环转变为热液岩相的五元环和七元环或两种环的组合。另一半8元环的键在整个转化过程中保持不变。当两个相邻的6元环的一个公共边断裂或特定公共边的两个相邻边（每个环一个）断裂时，转化开始。在转化过程中，大多数原子的键没有变化，位置也几乎没有变化。从旧骨架中脱离的两个（Si，A1）原子经历2.6 A的位移，而剩余的十个（Si，A1）原子的位移范围仅为0-01至0.35 A。这种转变的研究似乎表明，在转变过程中，每个原子的运动可能会被使用的结构信息。
The high-quartz phase of LiA1Si206 composition reconstructively transforms into the keatite phase at elevated temperature. The transformation matrix was first derived from the powder data and then confirmed by the single-crystal data. (Si,A1)-tetrahedra form 6and 8-membered rings in the high-quartz phase but form 5-,7-, and 8-membered rings in the keatite phase. All the 6-membered rings and half of the 8-membered rings transform into 5and 7-membered rings or a combination of both types of rings of the keatite phase. The linkages of other half of the 8-membered rings remain unchanged throughout the transformation. Transformation starts when either one common edge of two neighboring 6-membered rings is broken or the two adjacent edges, one at each ring, of the particular common edge are broken. During the transformation, most atoms undergo no change in linkage and little change in position. Two (Si,A1) atoms which break away from the old framework undergo a displacement of 2.6 A, while the displacements of the remaining ten (Si,A1) atoms range only from 0-01 to 0.35 A. This transformation study seems to indicate the possibility that the movement of each atom during the transformation may be followed by the use of the structural information.