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
Source abstract
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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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Magnetic and transport properties of perovskites and related materials · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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