High-Temperature X-ray Diffraction Study of La[sub 0.6]A[sub 0.2]Mn[sub 1.2]O[sub 3 ± δ] (A[sup 2+] = Sr[sup 2+], Pb[sup 2+]) Metal Oxide Ceramics Exhibiting Colossal Magnetoresistance

Abstract

The temperature dependence of the lattice parameters in lanthanum manganite oxides doped with strontium and lead ions has been studied by high-temperature X-ray diffraction. The lattice parameters exhibit anomalous behavior, which is probably related to the dissolution of cluster compounds in the matrix structure with increasing temperature. Additional annealing in oxygen led to a significant change in the lattice parameters but did not influence the magnetoresistance of samples.