Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3

IUCrJ
Charlotte A L DixonPhilip Lightfoot

Abstract

The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150-300°C; these two phases correspond to Glazer tilt systems a(-)a(-)a(-) and a(+)a(+)c(-), respectively. At 500°C a ferroelectric-paraelectric transition takes place from P42mc to P42/nmc, retaining the a(+)a(+)c(-) tilt. Transformation to a single-tilt system, a(0)a(0)c(+) (space group P4/mbm), occurs at 750°C, with the final transition to the aristotype cubic phase at 850°C. The P42mc and P42/nmc phases have each been seen only once and twice each, respectively, in perovskite crystallography, in each case in compositions prepared at high pressure.

References

Nov 2, 2004·Nature·Yasuyoshi SaitoMasaya Nakamura
Jun 7, 2012·Inorganic Chemistry·Martin D PeelPhilip Lightfoot
Jul 17, 2013·Inorganic Chemistry·Martin D PeelPhilip Lightfoot
Jun 18, 2016·Angewandte Chemie·Elena Solana-MadrugaJ Paul Attfield

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Citations

May 18, 2017·IUCrJ·Brendan J Kennedy
Aug 15, 2020·Inorganic Chemistry·Umair FaridBrendan J Kennedy

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Methods Mentioned

BETA
neutron diffraction
X-ray

Software Mentioned

EXPGUI
GSAS
ISODISTORT

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