A temperature-dependent structural investigation of electrical transitions in A3conb2o9 perovskites (A=Ca2+, Sr2+, Ba2+)

Valeska Ting, Y Liu, R Withers

Research output: Contribution to journalArticle

Abstract

Upon heating, the 1:2 triple perovskites A3CoNb2O9 (A=Ca, Sr or Ba) each undergo well-defined insulator to conductor phase transitions at ∼8, ∼126 and ∼325 °C, respectively. As the trend in the transition temperatures for these materials does not correlate with the size of the reported band gaps, neutron powder diffraction has been used to investigate if this change in electrical behaviour of the materials was due to a structural phase change. It was found that in the regions of the suspected phase transitions there were only slight perturbations of the structures, namely thermal expansion of the lattices and an apparent muting of the amplitude of the octahedral rotations in the A=Ca and Sr compound at higher temperatures.
Original languageEnglish
Pages (from-to)558-560
Number of pages3
JournalPhysica B Condensed Matter
Volume385-386
Issue number1
DOIs
Publication statusPublished - 2006

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