Tridymite
Graetsch H
Physics and Chemistry of Minerals 28 (2001) 313-321
X-ray powder diffraction study on the modulated high temperature forms
of SiO2 tridymite between 110 and 220 C
Sample: T = 150 C
Locality: synthetic
_database_code_amcsd 0008552
8.7560 5.0108 8.2153 90 90.2825 90 *C2_1
0 .25 0
atom      x      y       z  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Si1   .1759  .5489 .684500 .0615   .037   .082   .065  -.013   .009  -.004
Si2   .1572  .4465   .3098 .0476   .055   .036   .052  -.003   .008  -.009
O1    .3350 -.0063  -.0031 .0959   .131   .131   .026  -.043   .006   .010
O2   -.0130  .4255   .2537 .1009   .025   .150   .128  -.034  -.040  -.056
O3    .2576  .3216   .7755 .1165   .177   .120   .054   .116  -.063  -.050
O4    .2419  .6738   .2147 .1148   .138   .071   .135  -.023   .007   .039