Low-temperature structural and dielectric phenomena in La1/3NbO3 and La1/3TaO3: Comparative study

abstract

The crystal structures of the perovskites La1/3NbO3 and La1/3TaO3 were studied between 10 and 350 K using high-resolution neutron powder diffraction and compared with their radio-frequency dielectric response over the same temperature range. The structure of La1/3NbO3 remains orthorhombic Cmmm, while La1/3TaO3 undergoes continuous transition from the high-temperature tetragonal P4/mmm to Cmmm phase at about 220 K. This transition is tricritical in nature and accompanied by no dielectric anomaly. In La1/3NbO3, the frequency-dependent peak of the dielectric permittivity is associated with an atypical increase in the lattice parameters below about 80 K. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3006331]

keywords

NEUTRON POWDER DIFFRACTION; GROUP-THEORETICAL-ANALYSIS; PHASE-TRANSITION; LAYERED PEROVSKITE; COMBINATION; CONDUCTION; LITHIUM; OXIDES; ND

subject category

Physics

authors

Salak, AN; Vyshatko, NP; Khalyavin, DD; Prokhnenko, O; Ferreira, VM

our authors

acknowledgements

The neutron diffraction experiment in BENSC has been supported by the European Commission under the sixth Framework Programme through the Key Action: Strengthening the European Research Infrastructures [Contract No. RII3-CT-2003-505925 (NMI 3)].

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