Characteristic length scale for strain fields around impurity cations in perovskites

Carpenter, Michael A. and McKnight, Ruth E. A. and Howard, Christopher J. and Zhou, Qingdi and Kennedy, Brendan J. and Knight, Kevin S. (2009) Characteristic length scale for strain fields around impurity cations in perovskites. Physical Review B, 80 (21). p. 214101. DOI

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Lattice parameters have been determined from high-resolution neutron-powder diffraction data collected as a function of temperature for perovskites in the Pr1−xLaxAlO3 solid solution in order to determine the influence of La doping on the Imma↔C2/m transition temperature, Tc∗. A plateau in Tc∗ at ∼150 K extends to x≈0.016±0.002, followed by a linear reduction with increasing LaAlO3 content. The plateau is interpreted in terms of a saturation effect such that there is a composition limit below which the strain fields surrounding individual La3+ ions are isolated in the PrAlO3 matrix and above which they overlap. On this basis the strain fields are estimated to have diameters of ∼16–18 Å, which appears to be a characteristic length scale for structural relaxation around dopant atoms and other types of local clusters in oxide perovskites.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA60;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 80
Page Range: p. 214101
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 23 Apr 2010 18:01
Last Modified: 23 Jul 2013 09:57

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