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Synthesis and evaluation of effective parameters in thermal expansion coefficient of Ln0.6Sr0.4Co0.2M0.8O3−δ (Ln = La,Nd and M = Mn,Fe) perovskite oxide

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Abstract

In this study, oxides Ln0.6Sr0.4Co0.2M0.8O3−δ (Ln = La,Nd and M = Mn,Fe) have been prepared and characterized to study the influence of the different cations on thermal expansion coefficient (TEC). TEC decreases favourably with replacement of Nd3+ and Mn3+ ions in the lattice. Nd3+ leads to decreasing ionicity of the Ln–O bond and phase transition from rhombohedral to orthorhombic. Structural parameters of compounds have been determined by X-ray diffraction (XRD). FT-IR analysis has been used to compare the bond strength of different cations in the lattice. Variations of lattice parameters of compounds have been monitored by in-situ XRD at different temperatures in order to study the thermo-chemical expansivity. Concentration of oxide ion vacancy has been determined by high temperature gravimetry. The results show more stability of Mn4+ ions in high temperature in comparison with Fe4+ ions, which suppreses the tendency to lose oxygen from the lattice with the increase in temperature.

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Authors and Affiliations

  1. Ceramic Division, Material and Energy Research Center, P. Box 31787-316, Karaj, Alborz, Iran

    FATEMEH HEYDARI, AMIR MAGHSOUDIPOUR, MASOUD ALIZADEH, ZAHRA KHAKPOUR & MASOUMEH JAVAHERI

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  1. FATEMEH HEYDARI
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  2. AMIR MAGHSOUDIPOUR
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  3. MASOUD ALIZADEH
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  4. ZAHRA KHAKPOUR
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  5. MASOUMEH JAVAHERI
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Correspondence to FATEMEH HEYDARI.

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HEYDARI, F., MAGHSOUDIPOUR, A., ALIZADEH, M. et al. Synthesis and evaluation of effective parameters in thermal expansion coefficient of Ln0.6Sr0.4Co0.2M0.8O3−δ (Ln = La,Nd and M = Mn,Fe) perovskite oxide. Bull Mater Sci 38, 1009–1014 (2015). https://doi.org/10.1007/s12034-015-0942-8

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  • DOI: https://doi.org/10.1007/s12034-015-0942-8

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