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Crystal structure of new phosphates Ca9–xPbxEu(PO4)7 from Rietveld refinement
Published online by Cambridge University Press: 23 April 2015
Abstract
New phosphates Ca9–xPbxEu(PO4)7 were obtained by solid state reaction techniques at 1213–1253 K in air atmosphere and were found to be isotypic with whitlockite-type β-Ca3(PO4)2. The unit cell parameters were determinate using Le Bail decomposition. Rietveld method structural refining showed that Eu3+ ions are located statistically with calcium in M1, M2, and M3 sites, whereas Pb2+-ions are preferentially located in the M3. Examination of optical second harmonic generation evidences nonlinear optical activity and confirms polar space group R3c.
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- Copyright © International Centre for Diffraction Data 2015
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