Journal
INORGANIC MATERIALS
Volume 47, Issue 2, Pages 172-177Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S002016851101002X
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The phase transitions and thermal expansion of apatite-structured compounds with the general formula M(5)(II)(A(V)O(4))(3)L (M(II) = Ca, Sr, Cd, Ba, Pb; A(V) = P,V; L = F, Cl) have been studied by high-temperature X-ray diffraction and differential thermal analysis. The Pb-containing apatites are shown to undergo phase transitions involving a reduction in unit-cell symmetry from hexagonal to monoclinic. The thermal expansion anisotropy in the hexagonal phases increases in the order Ca < Sr < Ba < Pb < Cd, and the monoclinic phases are less anisotropic but have larger thermal expansion coefficients in comparison with the hexagonal phases.
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