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- W1602142891 abstract "First-order Raman scattering of A1g and Eg modes originating from the antiferrodistortive F2u soft mode confirms the cubic-tetragonal (Oh-D4h) phase transition in Sr0.993Ca0.007TiO3, at T0=125 K. Within the cubic and the tetragonal phase first-order Raman scattering of the soft ferroelectric F1u mode (TO1) and of the hard TO2 and TO4 optic modes evidences the existence of Ca2+-centred polar microregions. Their size increases rapidly on cooling towards the ferroelectric ordering temperature, Tc=18 K. Splitting and incomplete softening of the F1u components is consistent with an order-disorder transition into an orthorhombic low-temperature phase with C2v symmetry." @default.
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- W1602142891 date "1994-02-07" @default.
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- W1602142891 title "Raman scattering of ferroelectric Sr<sub>1-x</sub>Ca<sub>x</sub>TiO<sub>3</sub>, x=0.007" @default.
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- W1602142891 doi "https://doi.org/10.1088/0953-8984/6/6/025" @default.
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