Funct. Mater. 2014; 21 (3): 247-254.
Synthesis, characterization and electrical properties of Pb(8-x)Na2Ndx(VO4)6O(x/2) solid solutions
[1] Department of Inorganic Chemistry, Donetsk National University, 24 Universitetskaya Str., 83001 Donetsk, Ukraine
[2] Department of Chemistry and Geology, Minnesota State University, Mankato, 241 Ford Hall, Mankato, 56001 Minnesota, United States
Substitution of neodymium for lead in the apatite structure in accordance to scheme 2Pb2+ +□ o→ 2Nd3+ + O2- has been investigated by X-ray powder diffraction, scanning electron microscopy, IR spectroscopy and the measurement of electrical conductivity. It was established that single phase solid solutions Pb(8-x)Na2Ndx(VO4)6O(x/2) are formed in the range of x = 0-0.25. The crystal structure features of some samples have been refined by the Rietveld method. It was shown that ions Nd3+ preferably occupy M(1) site. Influence of the composition x on the electrical conductivity and activation energy has been investigated.
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