Mishra, Sanjay Kumar ; Pandey, Dhananjai (2009) Evidence for first-order orthorhombic-tetragonal and nearly tricritical tetragonal-cubic antiferrodistortive phase transitions in Ca0.43Sr0.57TiO3 Physical Review B, 79 (17). 174111_1-174111_6. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v79/i17/e174111
Related URL: http://dx.doi.org/10.1103/PhysRevB.79.174111
Abstract
Temperature dependence of the symmetry-adopted strains (secondary order parameter) associated with the antiferrodistortive-phase transitions involving change in space groups from Pm3m to I4/mcm and I4/mcm to Pnma in Ca0.57Sr0.43TiO3 have been investigated using powder x-ray diffraction data in the temperature range of 300-950 K. It is argued that the experimentally determined critical exponent β~0.33±0.03 in the temperature range 0.70≤T≤0.98Tc for the I4/mcm to Pm3m transition is due to a nearly tricritical transition. The Pnma to I4/mcm transition is unambiguously identified as first order.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 27227 |
| Deposited On: | 10 Dec 2010 12:55 |
| Last Modified: | 05 Mar 2011 09:14 |
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