Ferroelectric precursor behavior of highly cation-ordered PbSc0.5Ta0.5O3 detected by acoustic emission: Tweed and polar nanoregions

Highly ordered ferroelectric PbSc0.5Ta0.5O3 crystals were studied by acoustic emission over a wide temperature range. Acoustic emission was found at three characteristic temperatures: 330, 409, and ≈600 K, which are close to those, known from the same disordered crystals, containing polar nanoregion...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (21)
Main Authors: Dul'kin, Evgeniy, Salje, Ekhard K. H., Aktas, Oktay, Whatmore, Roger W., Roth, Michael
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustics
Applied physics
Crystal structure
Emission analysis
Ferroelectric materials
Ferroelectricity
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Summary:Highly ordered ferroelectric PbSc0.5Ta0.5O3 crystals were studied by acoustic emission over a wide temperature range. Acoustic emission was found at three characteristic temperatures: 330, 409, and ≈600 K, which are close to those, known from the same disordered crystals, containing polar nanoregions. The microstructure in our crystals contains structural “tweed” rather than nanoregions. The coincidence of acoustic emission temperatures points towards a close structural relationship between nanoregions and “tweed.” Under electric field, these temperatures shift similar to “critical end point” behavior. The obtained data prove that acoustic emission detects signals in a wider parameter space than previously expected.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4902511