Funct. Mater. 2024; 31 (3): 336-340.
doi:https://doi.org/10.15407/fm31.03.336
Substitution of praseodymium by lead in Pb8Na2(PO4)6 at 850°C
1College of Science, Al-Karkh University of Science, Hayfa Street, Baghdad 10001, Iraq 2Department of Inorganic Chemistry, Donetsk National University, Donetsk 83001, Ukraine
Abstract:
This study analyzed the substitution of lead ions with praseodymium ions in sodium lead apatite. Two techniques, X-ray diffraction analysis and infrared spectroscopy, were used to examine the substitutions. The examination was based on the equation: 2Pb2+ + ν -> 2Pr3+ + O2–. The results were solid solutions with the composition Pb8-xNa2Prx(PO4)6Ox/2 (0.0 ≤ x ≤ 1.0). Lead sodium apatite samples produced at 850ºC ranged from x=0.0 to x=0.6. The following methods were used to determine the limits of the Pb substitute for Pr in lead sodium apatite: the method for determining the dependency of unit cell parameters and the vanishing phase method.
Keywords:
apatite structure, solid solutions, lead, praseodymium, sodium.
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