Issues

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2019

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vol. 17 /

Issue 2

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Mohammed A. B. Abdul Jabar
«Studying Solid Solutions of Substitution of Pb with Sm in Lead-Sodium Apatite Structure»
343–352 (2019)

PACS numbers: 61.46.Hk, 61.72.J-, 61.72.S-, 68.37.Hk, 78.30.Hv, 81.07.Bc, 82.75.-z

The substitution of lead with samarium in the Pb(8?x)Na2Smx(PO4)6Ox/2 solid solutions corresponding to the scheme is examined by X-ray diffractometer, IR-spectroscopy and scanning electron microscopy. The compositions with x???0, 0.20, 0.40, 0.60, 0.80, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0 are studied. All samples are synthesized by ceramic methods. The cycle of operations is carried out until a constant phase composition is accomplished. The total calcination time at a temperature of 850?C is 60 hours. Rietveld method displays that samarium ion (Sm3+) is located in positions of the Pb(2) type, and the distance in a polyhedron of Pb(2), which has the structure of apatite, is decreased.

Key words: lead, apatite, samarium, substitutional solid solution.

https://doi.org/10.15407/nnn.17.02.343

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