A NEW INCOMMENSURATE PHASE IN A LEAD ORDERED PEROVSKITE - PB2MGTEO6

被引：19

作者：

BALDINOZZI, G

SCIAU, P

MORET, J

BUFFAT, PA

机构：

[1] UNIV MONTPELLIER 2,DYNAM PHASES CONDENSEES GRP,F-34095 MONTPELLIER,FRANCE

[2] ECOLE POLYTECH LAUSANNE,INST INTERDEPT MICROSCOPIE ELECTRON,CH-1015 LAUSANNE,SWITZERLAND

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 89卷 / 05期

关键词：

D O I：

10.1016/0038-1098(94)90209-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Transmission electron microscopy and X-ray powder diffraction have revealed an incommensurate phase in Pb2MgTeO6. Only two other complex perovskites give such phases. Moreover, Pb2MgTeO6 incommensurate phase shows some unique characteristics: no lock-in transition, an extended domain of stability. Thanks to precise X-ray powder diffraction, we have found that the modulation vector is along [111](C) directions. The lower temperature phase has an average trigonal symmetry. Thermal evolution of lattice parameters is given between 8 and 800 K. Critical exponents of satellite intensities are also given.

引用

页码：441 / 445

页数：5

共 15 条

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