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• W2076345480 endingPage "2092" @default.
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• W2076345480 abstract "The room-temperature Raman spectra of Sr1-xCaxTiO3 (SCT) for x = 0.06 (SCT06), 0.12 (SCT12) and 0.30 (SCT30) are shown to contain first-order Raman lines corresponding to Eg and B1g modes, which appear below 105 K in pure SrTiO3. The Eg line shows slight asymmetry, indicating the orthorhombic structure of SCT for x⩾0.06. The low-temperature Raman spectra of SCT06 and SCT12 contain Raman-active modes of symmetry B2g and Eg, predicted by group theory but not observed in SrTiO3 or SCT0.7 (x = 0.007) by previous workers. The polar hard modes TO2 (175 cm-1) and TO4 (550 cm-1) are present even at room temperature for SCT06 and SCT12 due to Ca2+-centred ferroelectric microregions. The intensity of these modes starts increasing below 55 and 80 K for SCT06 and SCT12 respectively, which are nearly 2 Tc, where Tc is the temperature of the smeared dielectric peak. The presence of such an extended precursor region is akin to relaxor behaviour. For SCT30, two new lines at 79 and 128 cm-1 appear below the paraelectric to antiferroelectric phase transition temperature of 230 K. It is shown that Raman lines characteristic of both ferroelectric and antiferroelectric phases are present in SCT12 below 100 K, confirming the frustration model for the highly smeared dielectric response for this composition." @default.
• W2076345480 created "2016-06-24" @default.
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• W2076345480 date "2002-02-15" @default.
• W2076345480 modified "2023-09-27" @default.
• W2076345480 title "A Raman scattering study of the phase transitions in SrTiO₃and in the mixed system (Sr_1-<i>x</i>Ca_<i>x</i>)TiO₃at ambient pressure from<i>T</i>= 300 K down to 8 K" @default.
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• W2076345480 doi "https://doi.org/10.1088/0953-8984/14/8/333" @default.
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