Abstract
Lattice parameters have been determined from high-resolution neutron-powder diffraction data collected as a function of temperature for perovskites in the solid solution in order to determine the influence of La doping on the transition temperature, . A plateau in at extends to , followed by a linear reduction with increasing 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 ions are isolated in the matrix and above which they overlap. On this basis the strain fields are estimated to have diameters of , which appears to be a characteristic length scale for structural relaxation around dopant atoms and other types of local clusters in oxide perovskites.
- Received 20 April 2009
DOI:https://doi.org/10.1103/PhysRevB.80.214101
©2009 American Physical Society