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Ferroelectrics Volume 37, 1981 - Issue 1
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Original Articles

Behavior of the A1 symmetry phonon-polariton at the tetragonal-cubic phase transition in BaTiO3

J. A. Sanjurjo Instituto de Física “Gleb Wataghin” Universidade Estadual de Campinas, 13100, Campinas SP, Brasil
&
R. S. Katiyar Instituto de Física “Gleb Wataghin” Universidade Estadual de Campinas, 13100, Campinas SP, Brasil
Pages 693-696 | Published online: 07 Feb 2011
 
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Abstract

The temperature dependence of the A1 modes at the tetragonal-cubic phase transition in BaTiO3 has been studied by Raman measurements in the forward scattering geometry. The unshifted broad structure at around 270 cm−1 in polariton spectra as well as its presence in the cubic phase is explained. The “disorder” model of Comes, Lambert and Guinier is used to explain the phonon behavior at the phase transition. A comparative analysis with recent infrared studies and previous Raman works is also made.

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Related Research Data

Raman scattering by polaritons in tetragonal BaTiO3
Source: Elsevier BV
Direct observation of relaxation modes in KNbO3 and BaTiO3 using inelastic light scattering.
Source: American Physical Society (APS)
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Dielectric and optical properties of melt-grown BaTiO3
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Soft Optic Modes in Barium Titanate
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Temperature behaviour of the dielectric constant of tetragonal BaTiO3
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The Raman spectrum of BaTiO3
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Temperature dependence of the Raman cross section and light absorption in cubic BaTiO3
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Evidence from Raman Scattering for an Overdamped Soft Optic Mode in BaTiO 3
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Temperature Dependence of the Transverse and Longitudinal Optic Mode Frequencies and Charges in SrTi O 3 and BaTi O 3
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The chain structure and phase transition of BaTiO3 and KNbO3
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Polaritons in tetragonal BaTiO3; Theory of the Raman line shape☆
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Temperature dependent polariton measurements in BaTiO3
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