Fabrication and thermoelectric properties of perovskite-type oxide La1−xSrxCoO3 (x = 0, 0.1)
Fabrication and thermoelectric properties of perovskite-type oxide La1−xSrxCoO3 (x = 0, 0.1)
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DOI：
10.1016/j.jallcom.2005.12.127
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发表时间：
2008-01
影响因子：
6.2
通讯作者：
A. Zhou;T. Zhu;Xinbing Zhao;Haiyan Chen;E. Müller
中科院分区：
文献类型：
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作者：
A. Zhou;T. Zhu;Xinbing Zhao;Haiyan Chen;E. Müller
采用固相反应和溶胶-凝胶法合成了P型钙钛矿氧化物La1−xSrxCoO3(x=0，0.1)。研究了样品的Seebeck系数、电导率和热导率。结果表明，La的掺杂显著提高了材料的电导率，但降低了材料的Seebeck系数和热导率。由不同路线制备的相同组成的样品在形貌上有所不同，但具有相似的导电机理，具有相同的能隙Eg和动热ΔHm。密度对电导率和热导率的影响是明显的。La0.9Sr0.1CoO3的室温ZT值为0.046，与单晶NaCo2O4的室温ZT值相当。
P-type perovskite oxides La1−xSrxCoO3(x=0, 0.1) have been prepared by solid state reactions and sol–gel processes. The Seebeck coefficient, electrical conductivity and thermal conductivity of the samples have been investigated. It is found that substitution of Sr for La significantly improved the electrical conductivity but reduced the Seebeck coefficients and thermal conductivity. The samples with the same composition prepared from different routes distinguished from each other in morphologies but exhibited similar conductive mechanism and had the same energy gap Egand motional enthalpy ΔHm. The effects of density on electrical and thermal conductivity were obvious. The room-temperature ZT value of the sol–gel derived La0.9Sr0.1CoO3was 0.046, which is comparable to that of the single crystal NaCo2O4(ZT=0.03).