Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)

Y. R.S. Choudhary; Suraj Mangavati; Siddanagouda Patil; Ashok Rao; B. S. Nagaraja; Riya Thomas; G. S. Okram; Savitha G. Kini

doi:10.1016/j.jmmm.2017.11.007

Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)

Y. R.S. Choudhary, Suraj Mangavati, Siddanagouda Patil, Ashok Rao^*, B. S. Nagaraja, Riya Thomas, G. S. Okram, Savitha G. Kini

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

In the present communication, we present results on the effect of rare-earth (RE) substitution at La-site on the structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds. The lattice parameters are observed to decrease with RE-doping which is attributed to the fact that the substituted RE ions (RE = Eu, Gd and Y) are smaller than that of La ion. In high temperature semiconducting regime, small polaron hopping (SPH) model is valid, whereas, variable hopping model is valid in low temperature metallic region. The resistivity in the entire temperature range follows percolation model. All the samples exhibit sign reversal in thermopower, S. From temperature dependent S data, it is seen that SPH model is applicable in high temperature regime.

Original language	English
Pages (from-to)	110-120
Number of pages	11
Journal	Journal of Magnetism and Magnetic Materials
Volume	451
DOIs	https://doi.org/10.1016/j.jmmm.2017.11.007
Publication status	Published - 01-04-2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2017.11.007

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Choudhary, Y. R. S., Mangavati, S., Patil, S., Rao, A., Nagaraja, B. S., Thomas, R., Okram, G. S., & Kini, S. G. (2018). Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y). Journal of Magnetism and Magnetic Materials, 451, 110-120. https://doi.org/10.1016/j.jmmm.2017.11.007

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title = "Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)",

abstract = "In the present communication, we present results on the effect of rare-earth (RE) substitution at La-site on the structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds. The lattice parameters are observed to decrease with RE-doping which is attributed to the fact that the substituted RE ions (RE = Eu, Gd and Y) are smaller than that of La ion. In high temperature semiconducting regime, small polaron hopping (SPH) model is valid, whereas, variable hopping model is valid in low temperature metallic region. The resistivity in the entire temperature range follows percolation model. All the samples exhibit sign reversal in thermopower, S. From temperature dependent S data, it is seen that SPH model is applicable in high temperature regime.",

author = "Choudhary, {Y. R.S.} and Suraj Mangavati and Siddanagouda Patil and Ashok Rao and Nagaraja, {B. S.} and Riya Thomas and Okram, {G. S.} and Kini, {Savitha G.}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

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day = "1",

doi = "10.1016/j.jmmm.2017.11.007",

language = "English",

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Choudhary, YRS, Mangavati, S, Patil, S, Rao, A, Nagaraja, BS, Thomas, R, Okram, GS & Kini, SG 2018, 'Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)', Journal of Magnetism and Magnetic Materials, vol. 451, pp. 110-120. https://doi.org/10.1016/j.jmmm.2017.11.007

Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y). / Choudhary, Y. R.S.; Mangavati, Suraj; Patil, Siddanagouda et al.
In: Journal of Magnetism and Magnetic Materials, Vol. 451, 01.04.2018, p. 110-120.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)

AU - Choudhary, Y. R.S.

AU - Mangavati, Suraj

AU - Patil, Siddanagouda

AU - Rao, Ashok

AU - Nagaraja, B. S.

AU - Thomas, Riya

AU - Okram, G. S.

AU - Kini, Savitha G.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - In the present communication, we present results on the effect of rare-earth (RE) substitution at La-site on the structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds. The lattice parameters are observed to decrease with RE-doping which is attributed to the fact that the substituted RE ions (RE = Eu, Gd and Y) are smaller than that of La ion. In high temperature semiconducting regime, small polaron hopping (SPH) model is valid, whereas, variable hopping model is valid in low temperature metallic region. The resistivity in the entire temperature range follows percolation model. All the samples exhibit sign reversal in thermopower, S. From temperature dependent S data, it is seen that SPH model is applicable in high temperature regime.

AB - In the present communication, we present results on the effect of rare-earth (RE) substitution at La-site on the structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds. The lattice parameters are observed to decrease with RE-doping which is attributed to the fact that the substituted RE ions (RE = Eu, Gd and Y) are smaller than that of La ion. In high temperature semiconducting regime, small polaron hopping (SPH) model is valid, whereas, variable hopping model is valid in low temperature metallic region. The resistivity in the entire temperature range follows percolation model. All the samples exhibit sign reversal in thermopower, S. From temperature dependent S data, it is seen that SPH model is applicable in high temperature regime.

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VL - 451

SP - 110

EP - 120

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)

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Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La0.7−xRExSr0.3MnO3 compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)

Abstract

All Science Journal Classification (ASJC) codes

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Effect of rare-earth substitution at La-site on structural, electrical and thermoelectric properties of La_0.7−xRE_xSr_0.3MnO₃ compounds (x = 0, 0.2, 0.3; RE = Eu, Gd, Y)