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Identification of two lead perovskites, Pb2ScTaO6 and Pb(Sc0.5Nb0.5)O3, by X-ray powder diffraction patterns

Published online by Cambridge University Press:  10 January 2013

C. Caranoni ,
P. Lampin  and
C. Boulesteix
C. Caranoni
Affiliation:
Laboratoire Matériaux: Organisation et Propriétés associé au C.N.R.S., Case 151, Faculté des Sciences et Techniques, Avenue Escadrille Normandie-Niemen, F-13397 Marseille Cedex 20, France
P. Lampin
Affiliation:
Laboratoire Matériaux: Organisation et Propriétés associé au C.N.R.S., Case 151, Faculté des Sciences et Techniques, Avenue Escadrille Normandie-Niemen, F-13397 Marseille Cedex 20, France
C. Boulesteix
Affiliation:
Laboratoire Matériaux: Organisation et Propriétés associé au C.N.R.S., Case 151, Faculté des Sciences et Techniques, Avenue Escadrille Normandie-Niemen, F-13397 Marseille Cedex 20, France
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Abstract

Substituting cations in materials with the formula Pb2B′B″O6 is more or less ordered on the B sites. High-quality single crystals of Pb2ScTaO6 (PST) and Pb(Sc0.5Nb0.5)O3 (PSN) were prepared from two thermal cycles. A stoichiometric mixture of the constituent oxides was prefired at up to 1000 °C, and then crystals were grown from a PbO–B2O3–PbF2 flux mixture, starting at a temperature of 1100 °C for PSN and 1200 °C for PST. At room temperature, X-ray examination showed that PSN had a perovskite structure with a cubic unit-cell and a refined parameter a = 4.080(1 ) Å, space group Pm3m and Z = 1, whereas PST formed a well-ordered superlattice with a = 8.136(1) Å, Z = 4 and space group Fm3m. In each case a fully indexed powder pattern is presented. The degree of order is estimated to be close to 80% for PST and less than 10% for PSN.

Type
Research Article
Information
Powder Diffraction , Volume 8 , Issue 3 , September 1993 , pp. 191 - 193
Copyright
Copyright © Cambridge University Press 1993

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