Abstract
The effects of partial substitution of La by a smaller Lanthanide element (R) in La 0.7-x R x Ca 0.3 MnO 3 ( R = Ce , Pr, Nd Sm, Gd, Dy with x = 0 and 0.1) ceramic pellets on the electron paramagnetic resonance has been investigated. The line width increased with decrease in ionic radius of the A site <r A > in paramagnetic phase, which is explained on the basis of tolerance factor. The observed increase in g-value and line width with increase in <r A > in ferromagnetic phase explained qualitatively by Mn-O-Mn bond angle distortion and Mn-O orbital overlap which in turn is governed by the size of the substitution ion.
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