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Figure 8
Refined lattice parameters for the three phase assemblages in Ca6Pb9Si9 − xGexO33 polysomes. Disequilbrium is reminiscent of that observed previously in (Ca,Pb)10(VO4)6F2 apatites where several weeks high-temperature annealing were required to obtain a stable phase assemblage (Dong & White, 2004aBB18,bBB19). Over the whole compositional range the greater span of the c axis, compared with the basal plane, may reflect module, chemical or stacking disorder.

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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