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Figure 3
Temperature fits over 13–838 K of the independent displacement ellipsoid matrix elements of the prototype Si atom. They are the same for dextro α-quartz in the z(+) setting and for laevo α-quartz in the z(−) setting. Because of the twofold site symmetry, β12 = β22/2 and β13 = β23/2. To convert to the obverse r settings, switch the signs of β13 and β23 as shown in Table 8[link].

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 4| August 2022| Pages 1011-1028
https://doi.org/10.1107/S1600576722005945
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