ELECTRICAL-TRANSPORT PROPERTIES AND HIGH-TEMPERATURE THERMOELECTRIC PERFORMANCE OF (CA(0.9)M(0.1))MNO3 (M=Y,LA,CE,SM,IN,SN,SB,PB,BI)
ELECTRICAL-TRANSPORT PROPERTIES AND HIGH-TEMPERATURE THERMOELECTRIC PERFORMANCE OF (CA(0.9)M(0.1))MNO3 (M=Y,LA,CE,SM,IN,SN,SB,PB,BI)
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DOI：
10.1006/jssc.1995.1384
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发表时间：
1995-11-15
影响因子：
3.3
通讯作者：
ARAI, H
中科院分区：
文献类型：
--
作者：
OHTAKI, M;KOGA, H;ARAI, H
研究了(Ca(0.9)M(0.1))MnO3(M。研究了Y， La, Ce, Sm, In, Sn, Sb, Pb, Bi)的高温热电转换新材料。在Ca位点的取代引起了电导率σ的显著增加，同时塞贝克系数s的绝对值适度降低。对数σ T与1/T的曲线呈负线性关系，表明在这些氧化物中发生了跳变导电。室温下的σ值随着阳离子取代基离子半径的增加而增加，这意味着由于跳变的位点间距离增大，载流子迁移率增加。（Ca0.9Bi0.1）MnO3样品在800℃时达到最大的功率因数，2.8 × 10(-4)/W m(-1)K(-2)，在600-900℃的宽温度范围内得到0.7-0.75 × 10(-4)K（-1）。氧化物在900℃时显示最大ZT值为0.085。
The electrical transport properties of (Ca(0.9)M(0.1))MnO3(M. Y, La, Ce, Sm, In, Sn, Sb, Pb, Bi) are investigated in terms of a new material for high-temperature thermoelectric conversion. The substitution at the Ca site causes a marked increase in the electrical conductivity sigma, along with a moderate decrease in the absolute value of the Seebeck coefficient S. The plots of log sigma T vs 1/T show a negative linear relation, indicating that hopping conduction occurs in these oxides. The sigma values at room temperature increase with increasing ionic radii of the cation substituents, implying an increase in the carrier mobility due to larger intersite distance for hopping. The sample of (Ca0.9Bi0.1)MnO3 attains the largest power factor, 2.8 x 10(-4)/W m(-1)K(-2), at 800 degrees C and leads to the figure of merit 0.7-0.75 x 10(-4)K(-1) over the wide range of temperatures 600-900 degrees C. The oxide shows a maximum ZT value of 0.085 at 900 degrees C. (C) 1995 Academic Press, Inc.