Logarithmic velocity variations for longitudinal ultrasonic waves in cubic BaTio3 near its ferroelectric transition
نویسندگان
چکیده
منابع مشابه
Ferroelectric phase transition in individual single-crystalline BaTiO3 nanowires.
We report scanned probe characterizations of the ferroelectric phase transition in individual barium titanate (BaTiO3) nanowires. Variable-temperature electrostatic force microscopy is used to manipulate, image, and evaluate the diameter-dependent stability of ferroelectric polarizations. These measurements show that the ferroelectric phase transition temperature (TC) is depressed as the nanowi...
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Linearized augmented plane wave (LAPW) calculations are performed for periodic (001) and (111) slabs of BaTiO3 to understand the effects of surfaces on ferroelectric BaTiO3. The (111) slab is found to be much less stable than the (001) slab. The average surface energies are respectively 3700 erg/cm and 1600 erg/cm. The depolarization field is sufficiently large in the ideal unrelaxated slab to ...
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Using quantum mechanics (QM, Density Functional Theory) we show that all four phases of barium titanate (BaTiO(3)) have local Ti distortions toward 111 (an octahedral face). The stable rhombohedral phase has all distortions in phase (ferroelectric, FE), whereas higher temperature phases have antiferroelectric coupling (AFE) in one, two, or three dimensions (orthorhombic, tetragonal, cubic). Thi...
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ژورنال
عنوان ژورنال: Journal de Physique Lettres
سال: 1978
ISSN: 0302-072X
DOI: 10.1051/jphyslet:019780039013022700