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Figure 13
(a) Postulated topology of Si2O7 constructed cages surrounding La3+ vacancies in the LaO6 prismatic columns of lanthanum silicate oxyapatite electrolytes. Also indicated in blue are Si2O9 dimers, which can be formed with interstitial oxygen ions. (b) Idealized, and to date hypothetical, [La10□2][La18][(Si2O7)3(Si2O9)3(SiO4)6]O6 structural arrangement in equilibrated La9.33Si6O26, where the La3+ vacancies condense as Si2O7 cages (αα), with interstitial oxygen ions between some (αβ) boundaries, to create an N = 6 polysome.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 66| Part 1| February 2010| Pages 1-16
https://doi.org/10.1107/S0108768109053981
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