Abstract
Structural and magnetic properties of Sr-doped Pr0.7Ba0.3MnO3 polycrystallines prepared by solid state reaction are presented. Samples were in monoclinic structure P21/n without structural phase transition when Ba was gradually replaced by Sr. Parameters a, b, and c of a unit cell monotonously decrease with increasing Sr content, while β angle has increased from 89.981° to 90.007°. The X-ray absorption spectra show the co-existence of Mn3+ and Mn4+ ions in materials and the number of Mn4+ ions increases in the presence of Sr. The thermal magnetization data indicate that the Curie temperature shifts toward room temperature from 190, 210, 232 to 267 K with increasing Sr content x from 0 to 0.3.
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