Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite

R. Kannan; D. Vanidha; A. Arun Kumar; K. U. Rama Tulasi; R. Sivakumar

doi:doi:10.11648/j.ijmsa.20130204.12

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Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite

R. Kannan, D. Vanidha, A. Arun Kumar, K. U. Rama Tulasi, R. Sivakumar

Published in International Journal of Materials Science and Applications (Volume 2, Issue 4)

Received: 19 June 2013 Published: 20 July 2013

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Abstract

Electron doped Ca1-xSbx MnO3 (X = 0 to 0.4) compound when prepared by high temperature solid state reaction, exhibits orthorhombic distorted perovskite structure. A systematic, continuous doping increases the metal – insulator transition temperature to above the room temperature (≈431 to 469 K); due to the mismatch of ionic radii in A site rising anti - site effect, which consequently changes the bond length. Doping induced metal – insulator transition accompanied by structural transition is reflected through the drastic changes in the parameters like cation size variance factor (), average ionic radius , tolerance factor (t) and To-which is correlated to the band related transport properties. Structural transition from the phase of perovskite to Brownmillerite has been found for the compositions x = 0.3 and 0.4, which is attributed due to the ionic radii mismatch. Doping exerts chemical pressure by modifying compression of A-O bond and relaxation of B-O bond, giving rise to strain similar to external pressure in ABO3 perovskite. The dependence of electrical transport at high temperature has been studied, by employing variable range hopping and small polaron hopping model as an account for the experimental observation due to disorder induced localization.

Published in	International Journal of Materials Science and Applications (Volume 2, Issue 4)
DOI	10.11648/j.ijmsa.20130204.12
Page(s)	128-135
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2013. Published by Science Publishing Group

Keywords

Phase Transition, Pervoskite, High Tc

References

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APA Style

R. Kannan, D. Vanidha, A. Arun Kumar, K. U. Rama Tulasi, R. Sivakumar. (2013). Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. International Journal of Materials Science and Applications, 2(4), 128-135. https://doi.org/10.11648/j.ijmsa.20130204.12

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ACS Style

R. Kannan; D. Vanidha; A. Arun Kumar; K. U. Rama Tulasi; R. Sivakumar. Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. Int. J. Mater. Sci. Appl. 2013, 2(4), 128-135. doi: 10.11648/j.ijmsa.20130204.12

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AMA Style

R. Kannan, D. Vanidha, A. Arun Kumar, K. U. Rama Tulasi, R. Sivakumar. Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. Int J Mater Sci Appl. 2013;2(4):128-135. doi: 10.11648/j.ijmsa.20130204.12

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@article{10.11648/j.ijmsa.20130204.12,
  author = {R. Kannan and D. Vanidha and A. Arun Kumar and K. U. Rama Tulasi and R. Sivakumar},
  title = {Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite},
  journal = {International Journal of Materials Science and Applications},
  volume = {2},
  number = {4},
  pages = {128-135},
  doi = {10.11648/j.ijmsa.20130204.12},
  url = {https://doi.org/10.11648/j.ijmsa.20130204.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20130204.12},
  abstract = {Electron doped Ca1-xSbx MnO3 (X = 0 to 0.4) compound when prepared by high temperature solid state reaction, exhibits orthorhombic distorted perovskite structure. A systematic, continuous doping increases the metal – insulator transition temperature to above the room temperature (≈431 to 469 K); due to the mismatch of ionic radii in A site rising anti - site effect, which consequently changes the bond length. Doping induced metal – insulator transition accompanied by structural transition is reflected through the drastic changes in the parameters like cation size variance factor (), average ionic radius , tolerance factor (t) and To-which is correlated to the band related transport properties. Structural transition from the phase of perovskite to Brownmillerite has been found for the compositions x = 0.3 and 0.4, which is attributed due to the ionic radii mismatch. Doping exerts chemical pressure by modifying compression of A-O bond and relaxation of B-O bond, giving rise to strain similar to external pressure in ABO3 perovskite. The dependence of electrical transport at high temperature has been studied, by employing variable range hopping and small polaron hopping model as an account for the experimental observation due to disorder induced localization.},
 year = {2013}
}

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TY - JOUR
T1 - Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite
AU - R. Kannan
AU - D. Vanidha
AU - A. Arun Kumar
AU - K. U. Rama Tulasi
AU - R. Sivakumar
Y1 - 2013/07/20
PY - 2013
N1 - https://doi.org/10.11648/j.ijmsa.20130204.12
DO - 10.11648/j.ijmsa.20130204.12
T2 - International Journal of Materials Science and Applications
JF - International Journal of Materials Science and Applications
JO - International Journal of Materials Science and Applications
SP - 128
EP - 135
PB - Science Publishing Group
SN - 2327-2643
UR - https://doi.org/10.11648/j.ijmsa.20130204.12
AB - Electron doped Ca1-xSbx MnO3 (X = 0 to 0.4) compound when prepared by high temperature solid state reaction, exhibits orthorhombic distorted perovskite structure. A systematic, continuous doping increases the metal – insulator transition temperature to above the room temperature (≈431 to 469 K); due to the mismatch of ionic radii in A site rising anti - site effect, which consequently changes the bond length. Doping induced metal – insulator transition accompanied by structural transition is reflected through the drastic changes in the parameters like cation size variance factor (), average ionic radius , tolerance factor (t) and To-which is correlated to the band related transport properties. Structural transition from the phase of perovskite to Brownmillerite has been found for the compositions x = 0.3 and 0.4, which is attributed due to the ionic radii mismatch. Doping exerts chemical pressure by modifying compression of A-O bond and relaxation of B-O bond, giving rise to strain similar to external pressure in ABO3 perovskite. The dependence of electrical transport at high temperature has been studied, by employing variable range hopping and small polaron hopping model as an account for the experimental observation due to disorder induced localization.
VL - 2
IS - 4
ER -

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Author Information

R. Kannan

Department of Physics, Pondicherry Engineering College, Pondicherry-605 014, India
D. Vanidha

Department of Physics, Pondicherry Engineering College, Pondicherry-605 014, India
A. Arun Kumar

Department of Physics, Pondicherry Engineering College, Pondicherry-605 014, India
K. U. Rama Tulasi

Department of Physics, Pondicherry Engineering College, Pondicherry-605 014, India
R. Sivakumar

Department of Physics, Pondicherry University, Pondicherry-605 014, India

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APA Style

R. Kannan, D. Vanidha, A. Arun Kumar, K. U. Rama Tulasi, R. Sivakumar. (2013). Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. International Journal of Materials Science and Applications, 2(4), 128-135. https://doi.org/10.11648/j.ijmsa.20130204.12

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ACS Style

R. Kannan; D. Vanidha; A. Arun Kumar; K. U. Rama Tulasi; R. Sivakumar. Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. Int. J. Mater. Sci. Appl. 2013, 2(4), 128-135. doi: 10.11648/j.ijmsa.20130204.12

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AMA Style

R. Kannan, D. Vanidha, A. Arun Kumar, K. U. Rama Tulasi, R. Sivakumar. Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite. Int J Mater Sci Appl. 2013;2(4):128-135. doi: 10.11648/j.ijmsa.20130204.12

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@article{10.11648/j.ijmsa.20130204.12,
  author = {R. Kannan and D. Vanidha and A. Arun Kumar and K. U. Rama Tulasi and R. Sivakumar},
  title = {Metal-Insulator Phase Transition and Structural Stability in ‘Sb’ Doped CaMnO3 Perovskite},
  journal = {International Journal of Materials Science and Applications},
  volume = {2},
  number = {4},
  pages = {128-135},
  doi = {10.11648/j.ijmsa.20130204.12},
  url = {https://doi.org/10.11648/j.ijmsa.20130204.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20130204.12},
  abstract = {Electron doped Ca1-xSbx MnO3 (X = 0 to 0.4) compound when prepared by high temperature solid state reaction, exhibits orthorhombic distorted perovskite structure. A systematic, continuous doping increases the metal – insulator transition temperature to above the room temperature (≈431 to 469 K); due to the mismatch of ionic radii in A site rising anti - site effect, which consequently changes the bond length. Doping induced metal – insulator transition accompanied by structural transition is reflected through the drastic changes in the parameters like cation size variance factor (), average ionic radius , tolerance factor (t) and To-which is correlated to the band related transport properties. Structural transition from the phase of perovskite to Brownmillerite has been found for the compositions x = 0.3 and 0.4, which is attributed due to the ionic radii mismatch. Doping exerts chemical pressure by modifying compression of A-O bond and relaxation of B-O bond, giving rise to strain similar to external pressure in ABO3 perovskite. The dependence of electrical transport at high temperature has been studied, by employing variable range hopping and small polaron hopping model as an account for the experimental observation due to disorder induced localization.},
 year = {2013}
}

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