An insight into the effects of transition metals on the thermal expansion of complex perovskite compounds: an experimental and density functional theory investigation
Literature Information
Xiao Wang, Ye Han, Xiaojie Song, Weihui Liu, Yinxi Jin, Wentao Liu, Hongzhi Cui
ABO3 perovskite-type LaCoO3, LaCo0.5Fe0.5O3, LaCo0.5Ni0.5O3, and LaCo0.5Mn0.5O3 complex oxides were synthesized using the sol–gel method. The microstructure and the thermal expansion behavior of the oxides were investigated. Insights into phonon dispersion and the effects of doped transition metals on thermal expansion were obtained by first-principles calculations based on density functional theory. Thermal expansion coefficients (TECs) at finite temperatures were obtained by quasi harmonic approximation. B-site doping was found to reduce the size of the crystalline grains and the TECs of perovskite compounds. The average TECs of LaCoO3, LaCo0.5Fe0.5O3, LaCo0.5Ni0.5O3, and LaCo0.5Mn0.5O3 were 25 × 10−6 K−1, 11 × 10−6 K−1, 12.5 × 10−6 K−1, and 5 × 10−6 K−1, respectively, in the 0–1000 K temperature range. In addition, the TECs of LaCo0.5Fe0.5O3 and LaCo0.5Ni0.5O3 matched well with those of some common electrolytes.
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