Funct. Mater. 2018; 25 (4): 713-719.
New gadolinium-substituted lead sodium apatite structure
1Department of Microbiology, College of Science, Al-Karkh University of Science, Hayfa Street, Baghdad 10001, Iraq
2Department of Inorganic Chemistry, Donetsk National University, 24 Universitets'ka, Donets'k 83001, Ukraine
The substitution of gadolinium by lead in the compound Pb8-xNa2Gdx(PO4)6Ox/2, in accordance with the scheme 2Pb2+ + • ↠ 2Gd3+ + O2- was studied by means of powder X-ray diffraction (including the Rietveld refinement). It was established that solid solutions apatite samples are synthesized at 900 °C between the range from x = 0.0 up to x = 1.0. Rietveld method shows that Gd3+ is located in positions Pb(2), resulting in the distance in a polyhedron Pb(2) where the structure of apatite decreased.
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