Structural and dielectric studies of the phase behaviour of the topological ferroelectric La1-xNdxTaO4

Keith J. Cordrey, Magda Stanczyk, Charlotte Amy Louise Dixon, Kevin S. Knight, Jonathan Gardner, Finlay D. Morrison, Philip Lightfoot

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The layered perovskite LaTaO4 has been prepared in its polar orthorhombic polymorphic form at ambient temperature. Although no structural phase transition is observed in the temperature interval 25° C < T < 500 °C, a very large axial thermal contraction effect is seen, which can be ascribed to an anomalous buckling of the perovskite octahedral layer. The non-polar monoclinic polymorph can be stabilised at ambient temperature by Nd-doping. A composition La0.90Nd0.10TaO4 shows a first-order monoclinic-orthorhombic (non-polar to polar) transition in the region 250° C < T < 350 °C. Dielectric responses are observed at both the above structural events but, despite the ‘topological ferroelectric’ nature of orthorhombic LaTaO4, we have not succeeded in obtaining ferroelectric PE hysteresis behaviour. Structural relationships in the wider family of AnBnX3n+2 layered perovskites are discussed.

Original languageEnglish
Pages (from-to)10673-10680
JournalDalton Transactions
Volume44
Issue number23
Early online date19 Jan 2015
DOIs
Publication statusPublished - 21 Jun 2015

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