掺镍对 LaCoO3 系统塞贝克系数的影响

Diego Mejía Echavarría, Viancy Isaza Zapata, Diego Muñoz, Hernando Correa, Ricardo Pineda Diego, Jorge Luis Izquierdo
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引用次数: 0

摘要

本研究旨在讨论通过固态反应合成的未掺杂和掺镍块状钴酸锂样品所取得的结果。通过 X 射线衍射 (XRD) 分析了样品的晶体结构,并使用 XRD 图样的里特维尔德细化来检测样品的质量,该过程的结果证实了(x=0 和 0.05)具有斜方晶体结构(空间群:)的 LaCo1-xNixO3 单相。人们对这一类材料的主要兴趣在于通过化学掺杂提高塞贝克系数和电阻率值的可能性。研究了从室温到 450 K 的塞贝克系数和电阻率,在接近室温时,LaCoO3 体系显示出较大的负塞贝克系数,但随着温度的升高,该系数变为正值,而 LaCo0.95Ni0.05O3 成分在整个温度范围内都显示出正塞贝克系数。因此,在本研究中,由于 Ni2+ 部分取代了 LaCoO3 中的 Co3+,Ni 取代导致样品的电阻率降低了一个数量级。之所以选择 LaCoO3 进行热电测试,是因为钴氧化物具有广泛的用途。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Ni-Doping on Seebeck Coefficient of LaCoO3 System
The aim of this study is discussing the results achieved on undoped and Ni-doped bulk LaCoO3 samples synthesized by solid-state reaction. The crystal structures of the samples were analyzed by x – ray diffraction (XRD) and Rietveld refinement of the XRD patterns was used to test the quality of the samples, the results of this procedure confirmed a single phase of LaCo1-xNixO3 for (x=0 and 0.05) with rhombohedral crystal structure (space group :). The main interest in this class of materials is the possibility of improving the values of Seebeck coefficient and electrical resistivity through chemical doping. The Seebeck coefficient and electrical resistivity were investigated from room temperature (RT) to 450 K, near RT the LaCoO3 system showed a large negative Seebeck coefficient, but it changed to positive value with increasing temperature while the LaCo0.95Ni0.05O3 composition showed a positive Seebeck coefficient throughout all the temperature range. Hence, within this study the Ni substitution led to decrease the electrical resistivity of the samples to one order of magnitude as a result of the partial substitution of Co3+ in LaCoO3 by Ni2+. LaCoO3 was chosen for this thermoelectric test because cobalt oxides have extensive applications.
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