A comparative structural, thermal and electrical study of Ca2+, Sr2+ substituted BiMnO3

Samita Thakur; O. P. Pandey; K. Singh

doi:10.1016/j.ssi.2014.09.022

A comparative structural, thermal and electrical study of Ca²⁺, Sr²⁺ substituted BiMnO₃

Samita Thakur, O. P. Pandey, K. Singh

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

9 Scopus citations

Abstract

Bi_{1 -x}A_xMnO₃ (A = Sr, Ca; 0.40 ≤ x ≤ 0.55) systems have been synthesized by solid state reaction method to investigate the effect of two different cations substitution in place of Bi^{3 +}. All samples are monophasic as observed in X-ray diffraction. The Bi_{1 -x}Sr_xMnO₃ shows the tetragonal symmetry whereas, Bi_{1 -x}Ca_xMnO₃ shows orthorhombic as confirmed by Rietveld refinement. The Bi_{1 -x}Sr_xMnO₃ system shows higher conductivity as compared to Bi_{1 -x}Ca_xMnO₃. Bi_0.50Sr_0.50MnO₃ exhibits highest conductivity of 180 S/cm at 790 °C which can be attributed to its higher specific free volume and uniform grain size with better distribution in entire structure. Sr^{2 +} doped system has lower thermal expansion coefficient as compared to Ca^{2 +} doped system.

Original language	English
Pages (from-to)	23-30
Number of pages	8
Journal	Solid State Ionics
Volume	268
Issue number	Part A
DOIs	https://doi.org/10.1016/j.ssi.2014.09.022
State	Published - 15 Dec 2014
Externally published	Yes

Keywords

Electrical conductivity
Rietveld refinement
X-ray diffraction (XRD)
ac impedance spectroscopy

Access to Document

10.1016/j.ssi.2014.09.022

Cite this

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title = "A comparative structural, thermal and electrical study of Ca2+, Sr2+ substituted BiMnO3",

abstract = "Bi1 -xAxMnO3 (A = Sr, Ca; 0.40 ≤ x ≤ 0.55) systems have been synthesized by solid state reaction method to investigate the effect of two different cations substitution in place of Bi3 +. All samples are monophasic as observed in X-ray diffraction. The Bi1 -xSrxMnO3 shows the tetragonal symmetry whereas, Bi1 -xCaxMnO3 shows orthorhombic as confirmed by Rietveld refinement. The Bi1 -xSrxMnO3 system shows higher conductivity as compared to Bi1 -xCaxMnO3. Bi0.50Sr0.50MnO3 exhibits highest conductivity of 180 S/cm at 790 °C which can be attributed to its higher specific free volume and uniform grain size with better distribution in entire structure. Sr2 + doped system has lower thermal expansion coefficient as compared to Ca2 + doped system.",

keywords = "Electrical conductivity, Rietveld refinement, X-ray diffraction (XRD), ac impedance spectroscopy",

author = "Samita Thakur and Pandey, {O. P.} and K. Singh",

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T1 - A comparative structural, thermal and electrical study of Ca2+, Sr2+ substituted BiMnO3

AU - Thakur, Samita

AU - Pandey, O. P.

AU - Singh, K.

PY - 2014/12/15

Y1 - 2014/12/15

N2 - Bi1 -xAxMnO3 (A = Sr, Ca; 0.40 ≤ x ≤ 0.55) systems have been synthesized by solid state reaction method to investigate the effect of two different cations substitution in place of Bi3 +. All samples are monophasic as observed in X-ray diffraction. The Bi1 -xSrxMnO3 shows the tetragonal symmetry whereas, Bi1 -xCaxMnO3 shows orthorhombic as confirmed by Rietveld refinement. The Bi1 -xSrxMnO3 system shows higher conductivity as compared to Bi1 -xCaxMnO3. Bi0.50Sr0.50MnO3 exhibits highest conductivity of 180 S/cm at 790 °C which can be attributed to its higher specific free volume and uniform grain size with better distribution in entire structure. Sr2 + doped system has lower thermal expansion coefficient as compared to Ca2 + doped system.

AB - Bi1 -xAxMnO3 (A = Sr, Ca; 0.40 ≤ x ≤ 0.55) systems have been synthesized by solid state reaction method to investigate the effect of two different cations substitution in place of Bi3 +. All samples are monophasic as observed in X-ray diffraction. The Bi1 -xSrxMnO3 shows the tetragonal symmetry whereas, Bi1 -xCaxMnO3 shows orthorhombic as confirmed by Rietveld refinement. The Bi1 -xSrxMnO3 system shows higher conductivity as compared to Bi1 -xCaxMnO3. Bi0.50Sr0.50MnO3 exhibits highest conductivity of 180 S/cm at 790 °C which can be attributed to its higher specific free volume and uniform grain size with better distribution in entire structure. Sr2 + doped system has lower thermal expansion coefficient as compared to Ca2 + doped system.

KW - Electrical conductivity

KW - Rietveld refinement

KW - X-ray diffraction (XRD)

KW - ac impedance spectroscopy

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