Resolving the controversies about the ‘nearly cubic’ and other phases of Sr1−xCaxTiO3(0≤x≤1): II. Comparison of phase transition behaviours for x= 0.40 and 0.43

Mishra, Sanjay Kumar ; Ranjan, Rajeev ; Pandey, Dhananjai ; Ranson, Pierre ; Ouillon, Robert ; Pinan-Lucarre, Jean-Paul ; Pruzan, Philippe (2006) Resolving the controversies about the ‘nearly cubic’ and other phases of Sr1−xCaxTiO3(0≤x≤1): II. Comparison of phase transition behaviours for x= 0.40 and 0.43 Journal of Physics: Condensed Matter, 18 (6). pp. 1899-1912. ISSN 0953-8984

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Official URL: http://doi.org/10.1088/0953-8984/18/6/007

Related URL: http://dx.doi.org/10.1088/0953-8984/18/6/007

Abstract

The phase transition behaviour of two 'nearly cubic' compositions, x = 0.40 and 0.43, of Sr1−xCaxTiO3, representative of Pbnm and Pbcm space group structures, has been investigated using temperature dependent dielectric, x-ray diffraction and Raman scattering techniques. For x = 0.40, a first order antiferroelectric phase transition occurs around 364 K followed by an antiferrodistortive phase transition involving the R point (q=1/2 1/2 1/2) instability at ∼800 K. For x = 0.43, on the other hand, there is no antiferroelectric phase transition. Instead, two antiferrodistortive transitions around 463 and 850 K linked with the M (q=1/2 1/2 0) and R (1/2 1/2 1/2) point instabilities, respectively, are observed. Both the compositions also exhibit qualitatively different types of phase transitions below room temperature. Evidence for a new phase transition at low temperatures is presented for x = 0.43.

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