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  • Title: Resolving the controversies about the 'nearly cubic' and other phases of Sr(1-x)Ca(x)TiO(3) (0≤x≤1): II. Comparison of phase transition behaviours for x = 0.40 and 0.43.
    Author: Mishra SK, Ranjan R, Pandey D, Ranson P, Ouillon R, Pinan-Lucarre JP, Pruzan P.
    Journal: J Phys Condens Matter; 2006 Feb 15; 18(6):1899-912. PubMed ID: 21697564.
    Abstract:
    The phase transition behaviour of two 'nearly cubic' compositions, x = 0.40 and 0.43, of Sr(1-x)Ca(x)TiO(3), 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 ([Formula: see text]) 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 ([Formula: see text]) and R ([Formula: see text]) 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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