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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

Dina Deyneko ,
Sergey Stefanovich  and
Bogdan Lazoryak
Dina Deyneko*
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, d. 1, Moscow, Russia
Sergey Stefanovich
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, d. 1, Moscow, Russia
Bogdan Lazoryak
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Leninskie gory, d. 1, Moscow, Russia
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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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.

Keywords

whitlockitepolar structurenonlinear optical activityphase transition Rietveld refinement
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Supplement S1 , June 2015 , pp. S101 - S103
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Copyright
Copyright © International Centre for Diffraction Data 2015 

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