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Investigation on synthesis, structural and electrical properties of Barium Stannate based complex Perovskites Ba1-xLaxSn1-xCoxO3

Manojit De, H S Tewari

Abstract


The effect of La for Ba and Co for Sn substitution on the properties of Barium stanate i.e. solid solution of LaCoO3 with BaSnO3 of the type Ba1-xLaxSn1-xCoxO3 is investigated for x ≤ 0.30.The powders are prepared using high temperature solid state reaction method for composition x ≤ 0.30. The structural investigations of powders are taken at room temperature by powder X-ray diffractometer. XRD pattern of the samples show the formation of single phase material. Seebeck coefficient is almost constant with temperature and material exhibit p-type conduction. DC conductivity increases with the concentration of LaCoO3. Thermally activated small polaron hopping mechanism is the responsible for conduction in these samples.


Keywords


Solid state ceramic method; XRD; Seebeck Coefficient; Small polaron hopping mechanism

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References


K. Balamurugan, N. Harish Kumar, J. Arout Chelvane, P. N. Santosh. Room temperature ferromagnetism in Fe-doped BaSnO3. Journal of Alloys and Compounds, 2009, 472, 9–12.

Y. Sharma, N. Sharma, G. V.Subba Rao, B. V. R.Chowdari. Studies on Nano-CaO• SnO2 and Nano-CaSnO3 as Anodes for Li-Ion Batteries. Chem. Mater., 2008, 20, 6829-6839.

Sohrab Ismail-Beigi, Frederick J.Walker, Sang-Wook Cheong, Karin M. AhnRabe, H.Charles. Alkaline earth stannates: The next silicon? APL Materials, 2015, 3, 062510-1-062510-5

H. Mizoguchi, H. W. Eng, P.M. Woodward.Probing the Electronic Structures of Ternary Perovskite and Pyrochlore Oxides Containing Sn4+ or Sb5+. Inorg. Chem., 2004,43, 1667-1680.

O. N. Mryasov,A. J. Freeman. Electronic band structure of indium tin oxide and criteria for transparent conducting behavior.Phys. Rev. B, 2001, 64, 233111-1-233111-3.

F.S. Galasso, Perovskites and High TC Superconductors, Gordon and Breach Science Publishers, New York, 1990.

R.H. Mitchell, Perovskites: Modern and Ancient, Almaz press, Thunder Bay, 2002.

G. Li, X. Kuang, S. Tian, F. Liao, X. Jing, Y. Uesu, K. Kohn. Structure and Conductivity of Perovskites Sr1-xLaxTi1-xCrxO3. J. Solid State Chemistry, 2002, 165, 381-392.

Guobao Li, Yoshiaki Uesu, Kay Kohn. Structural Characterization of the Complex Perovskites Ba1-xLaxTi1-xCrxO3. J. Solid State Chemistry.2002, 165, 98-105.

O.Prakash, H.S.Tewari, L.Pandey, R.Kumar, D.Kumar. Preparation, Structure, and Dielectric Properties of the System Bal-xLaxTil-xNixO3,Journal of American Ceramic Society, 1989, 72 (8), 1520-1522

R.D.Shannon, C. T.Prewitt. Effective Ionic Radii in Oxides and Fluorides.ActaCryst. B, 1969, 25, 925-946.

P. Dordor, S. Joiret, J. P. Doumerc, J. C. Lauray, J. Claverie, P. Hagenmullar. Electrical Properties of Lead-Doped LaCoO8 Single Crystals.Phys. Status Solidi (a), 1986, 93, 321-328.

D. P. Karim, A. T. Aldred. Localized level hopping transport in La(Sr)CrO3.Phys. Rev. B, 1979, 20, 2255.

G. F. Carini, N. U. Anderson, D. M. Sparlin, M. M.Nasraallah. Electrical conductivity, Seebeck coefficient and defect chemistry of Ca-doped YCrO3.Solid State Ionics, 1991, 49, 233.