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Figure 3
Variations in edge length of the A2 triangle with unit-cell edge length a in fluor-, chlor- and lacunary apatites together with those in Pb10(PO4)6O. Solid circles with solid lines: chlorapatites; solid triangles with dashed lines: fluorapatites; blue open squares: lacunarly apatites; black solid squares: three A2 triangles with different sizes in Pb10(PO4)6O. Purple: A2 = Ba; blue: A2 = Pb; green: A2 = Sr; red: A2 = Ca. Solid and dashed lines are drawn for guides for the eye after a least-squares fit for each combination of A2 and X ions.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 82| Part 1| February 2026| Pages 68-77
https://doi.org/10.1107/S2052520625010844
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