Isomorphism and phase diagram of Pb₅(PO₄)₃F–Pb₅(PO₄)₃Cl system

Compounds of composition Pb₅(PO₄)₃FₓCl₁₋ₓ (0≤x≤1), which are synthetic analogues of minerals pyromorphite, flourapatite, and endlichite, were synthesized for the first time by high-temperature solid phase reactions. X-ray diffraction and IR spectroscopy were used to determine the structure of the co...

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Bibliographic Details
Published in:Thermochimica acta 2011, Vol.513 (1-2), p.112-118
Main Authors: Knyazev, A.V, Chernorukov, N.G, Bulanov, E.N
Format: Article
Language:English
Subjects:
calorimetry
enthalpy
infrared spectroscopy
minerals
mixing
phase transition
physical phases
thermal analysis
X-ray diffraction
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Summary:Compounds of composition Pb₅(PO₄)₃FₓCl₁₋ₓ (0≤x≤1), which are synthetic analogues of minerals pyromorphite, flourapatite, and endlichite, were synthesized for the first time by high-temperature solid phase reactions. X-ray diffraction and IR spectroscopy were used to determine the structure of the compounds and revealed complete miscibility in the solid phase of the Pb₅(PO₄)₃F–Pb₅(PO₄)₃Cl binary system. Adiabatic reaction calorimetry was used to measure standard enthalpies of mixing and formation and show that the regular solutions model is applicable to the Pb₅(PO₄)₃F–Pb₅(PO₄)₃Cl system. Differential thermal analysis in tandem with high-temperature X-ray diffraction were used to study the phase diagram and characterize phase transitions.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2010.11.020