Daraktchiev, M. and Harrison, R. J. and Mountstevens, E. H. and Redfern, S. A. T. (2006) Effect of transformation twins on the anelastic behavior of polycrystalline Ca1-xSrxTiO3 and SrxBa1-xSnO3 perovskite in relation to the seismic properties of Earths mantle perovskite. Materials Science and Engineering A, 442 (1-2). pp. 199-203. ISSN 0921-5093 DOI https://doi.org/10.1016/j.msea.2006.01.141
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Abstract
The mechanical loss of Ca1−xSrxTiO3 as a function of temperature has been studied up to 1000 ◦C using dynamical mechanical analysis. The loss spectrum reveals a relaxation peak in the tetragonal phase and negligible mechanical loss in the cubic and orthorhombic phases. The peak is accompanied by a softening of the storage modulus, caused by the formation of mobile transformation twin domain walls. The small value of internal friction in the orthorhombic phase is associated with a negative volume strain, resulting in domain walls that are strongly pinned by lattice defects. The volume changes and mechanical loss in Ca1−xSrxTiO3 are compared with those in SrxBa1−xSnO3, a system which shows a positive volume strain. In contrast to Ca1−xSrxTiO3, SrxBa1−xSnO3 displays a thermally activated peak in the orthorhombic phase. A frequency-independent peak attributed to the tetragonal–orthorhombic transition is also seen. The positive volume strain in SrxBa1−xSnO3 results in domain wall structures that are less strongly pinned by lattice defects.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2006 AREP IA52 2006 P |
| Subjects: | 03 - Mineral Sciences |
| Divisions: | 03 - Mineral Sciences |
| Journal or Publication Title: | Materials Science and Engineering A |
| Volume: | 442 |
| Page Range: | pp. 199-203 |
| Identification Number: | https://doi.org/10.1016/j.msea.2006.01.141 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 16 Feb 2009 13:02 |
| Last Modified: | 23 Jul 2013 10:06 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/233 |
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