Phase transition in weberite-type Gd3NbO7

Lu Cai, Sava Denev, Venkatraman Gopalan, Juan C. Nino

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Gd3NbO7 has an orthorhombic weberite-type crystal structure and undergoes a phase transition at about 340 K. The phase transition was confirmed by second harmonic generation, heat capacity measurement, and high-resolution X-ray diffraction. Above 340 K, Gd3NbO7 has a centrosymmetric weberite-type structure with space group Cmcm (No. 63) and transforms at about 340 K into a non-centrosymmetric structure with space group Cm2m (No. 38). The phase transition is mainly due to off-center shifts of Nb5+ ions within NbO6 octahedra, as well as off-center shifts of one-third of the Gd3+ ions within GdO8 polyhedra.

Original languageEnglish (US)
Pages (from-to)875-880
Number of pages6
JournalJournal of the American Ceramic Society
Volume93
Issue number3
DOIs
StatePublished - Mar 1 2010

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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