Journal
PHYSICAL REVIEW B
Volume 80, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214101
Keywords
doping; lanthanum compounds; lattice constants; neutron diffraction; praseodymium compounds; solid-state phase transformations; stress effects
Funding
- Leverhulme Foundation
- Australian Research Council [DP0877695]
- Commonwealth of Australia
- Australian Research Council [DP0877695] Funding Source: Australian Research Council
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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 Pr(1-x)La(x)AlO(3) solid solution in order to determine the influence of La doping on the Imma <-> C2/m transition temperature, T(c)(*). A plateau in T(c)(*) at similar to 150 K extends to x approximate to 0.016 +/- 0.002, followed by a linear reduction with increasing LaAlO(3) 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 La(3+) ions are isolated in the PrAlO(3) matrix and above which they overlap. On this basis the strain fields are estimated to have diameters of similar to 16-18 A degrees, which appears to be a characteristic length scale for structural relaxation around dopant atoms and other types of local clusters in oxide perovskites.
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