With 252 Fo(hkl), least-squares solutions for the structure of Sc2Si20 ~ have been found in each of the space groups Cm, C2 and C2/m.After discussion, the correct space group is concluded to be C2/m and the Si-O-Si angle is therefore 180 ° [/n agreement with Zachariasen (1930)].The Si-O distances are all close to 1.62/~; the Sc-O distances average 2.13/~.
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Cruickshank et al. (1962) studied this question.
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