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

被引：7

作者：

Heydari, Fatemeh ^{[1
]}

Maghsoudipour, Amir ^{[1
]}

Alizadeh, Masoud ^{[1
]}

Khakpour, Zahra ^{[1
]}

Javaheri, Masoumeh ^{[1
]}

机构：

[1] Mat & Energy Res Ctr, Div Ceram, Karaj, Alborz, Iran

来源：

BULLETIN OF MATERIALS SCIENCE | 2015年 / 38卷 / 04期

关键词：

Thermal expansion coefficient; perovskite; bond strength; chemical expansion; LATTICE EXPANSION; ELECTRICAL-PROPERTIES; ION CONDUCTIVITY; SOFC CATHODE; NONSTOICHIOMETRY; REDUCTION; STABILITY;

D O I：

10.1007/s12034-015-0942-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, oxides Ln(0.6)Sr(0.4)Co(0.2)M(0.8)O(3-delta) (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.

引用

页码：1009 / 1014

页数：6

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