Mishra, Sanjay Kumar ; Pandey, Dhananjai (2009) Low temperature X-ray diffraction study of the phase transitions in Sr1-xCaxTiO3 (x=0.02,0.04): evidence for ferrielectric ordering Applied Physics Letters, 95 (3). 232910_1-232910_3. ISSN 0003-6951
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Official URL: http://apl.aip.org/resource/1/applab/v95/i23/p2329...
Related URL: http://dx.doi.org/10.1063/1.3273863
Abstract
X-ray diffraction studies on Sr1-x Cax TiO3 in the temperature range 12 to 300 K reveal cubic to tetragonal (I4/mcm) antiferrodistortive and tetragonal to orthorhombic (Ic2m) polar phase transitions at ~170 and 225, 32, 34 K, respectively, for x=0.02 and 0.04. It is shown that the polarization in the orthorhombic phase is along the <110> pseudocubic direction, in agreement with the experimentally reported easy polarization direction by Bednorz and Muller. However, in disagreement with them the moments are found to be ferrielectrically coupled in the neighboring (001) planes that is responsible for the anomalously low values of the spontaneous polarization in the polar phase.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Institute of Physics. |
ID Code: | 27252 |
Deposited On: | 10 Dec 2010 12:53 |
Last Modified: | 05 Mar 2011 09:13 |
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