| Structural and Transport Studies on Mixed Valent
Rare Earth Manganite Ceramics |
D. D. Pandya,1 Zalak Joshi,1 Davit Dhruv,1, 2 Keval Gadani,1 Hetal Boricha,1 K. N. Rathod,1
Sanjay Kansara,1 J. H. Markna,2 P. S. Solanki1 and N. A. Shah1, *
Pages : 165-170
DOI : 10.1080/0371750X.2017.1296784 |
| Abstract |
| La0.5Pr0.2Ca0.3–xBaxMnO3 (LPCBMO) (x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30) ceramic
manganites have been successfully synthesized by conventional solid state reaction
method. Structural studies have been carried out by performing X-ray diffraction
measurements and Rietveld refinements. Obtained value of crystallite size varies from
76 nm in lower doped sample (x=0.05) to 13 nm in the sample doped with x=0.30.
Variation in crystallite size with x has been discussed in the context of size mismatch
at A-site cationic lattice and structural disorder. In addition, all the samples exhibit
metal to insulator transition at TP which gets increased with increase in Ba-content
(x). Effect of crystallite size and other structural parameters on the transport properties
of LPCBMO samples has been discussed in detail in the light of competition between
the structural disorder and tolerance factor and shown that the tolerance factor can
effectively modify the transport behaviour in manganites. Below 50 K, all the R-T
plots of LPCBMO system show resistivity minimum behaviour which gets modified
by Ba-content. This behaviour has been discussed in detail on the basis of electronelectron
interaction having the form: ï² = [1/(ï³0+BT1/2)]+ï²nTn.
[Keywords: Rare earth, Ceramics, Manganite, Transport] |
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