Anelastic loss behaviour of mobile microstrutures in SrZr1-xTixO3 perovskites

Zhang, Zhiying and Koppensteiner, Johannes and Schranz, Wilfried and Carpenter, Michael A (2010) Anelastic loss behaviour of mobile microstrutures in SrZr1-xTixO3 perovskites. Journal of Physics: Condensed Matter, 22. p. 295401. DOI 10.1088/0953-8984/22/29/295401

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Abstract

Anelastic loss mechanisms associated with phase transitions in SrZr(1−x)TixO3 perovskites (x = 0.375, 0.450, 0.550, 0.775) have been investigated by dynamic mechanical analysis between 128 and 723 K at frequencies of 0.1–50 Hz. Distinctive patterns of changes in the elastic moduli due to octahedral tilting transitions correlate closely with data for the shear modulus obtained previously by resonant ultrasound spectroscopy at high frequencies (around 0.5 MHz). The I4/mcm ↔ Imma transition is first order and has a characteristic minimum in the shear modulus and Young’s modulus. For x = 0.450 and 0.550, a dissipation peak occurs at the transition temperature, the maximum of which varies with frequency according to a power law relationship of the form tan δ = Af^n, with n ≈ −0.3. Debye-like dissipation peaks in the stability field of the Imma structure at x = 0.375 have a frequency and temperature dependence consistent with twin wall pinning by defects with an activation energy around 184 kJ mol−1. These results indicate that there is diversity of pinning and relaxation processes for transformation twin walls and interfaces in different perovskites with I 4/mcm, Imma and Pnma structures.

Item Type: Article
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 22
Page Range: p. 295401
Identification Number: 10.1088/0953-8984/22/29/295401
Depositing User: Sarah Humbert
Date Deposited: 08 Jul 2011 10:35
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2106

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