The effect of alkaline earth metal substitution on thermoelectric properties of A0.98La0.02MnO3-δ (A=Ca,Ba)

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Processing and Application of Ceramics Pub Date : 2022-01-01 DOI:10.2298/pac2201078s

S. Singh, N. Kanas, M. Einarsrud, K. Wiik

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引用次数: 2

Abstract

The thermoelectric properties of ceramics with composition A0.98La0.02MnO3-? are anticipated to vary with the basicity and atomic portion of the alkaline earth metal, A. In the present investigation ceramic powder precursors with composition A0.98La0.02MnO3-? (A = Ca, Ba) were synthesized by the solid-state method and sintered in air at 1400?C. Seebeck coefficient, electrical and thermal conductivities were characterized for both materials from 100 to 900?C in air. The highest zT of 0.10 at 900?C was reached for Ca0.98La0.02MnO3-?. The high zT is attributed to the enhanced electronic conductivity (?90 S/cm at 900?C) due to La doping. zT for Ba0.98La0.02MnO3-? reached its highest value (0.02) at 800?C corresponding to a low electronic conductivity (?2 S/cm), while the thermal conductivity was significantly reduced compared to Ca0.98La0.02MnO3-? reaching ?1W/(m?K) combined with a high Seebeck coefficient, ?290 ?V/K. The present data represent a valuable basis for further development of these materials with respect to applications in thermoelectric devices.

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碱土金属取代对A0.98La0.02MnO3-δ (A=Ca,Ba)热电性能的影响

A0.98La0.02MnO3-?复合陶瓷的热电性能在本研究中，组成为A0.98La0.02MnO3-?的陶瓷粉末前驱体(A = Ca, Ba)采用固相法合成，在1400℃空气中烧结。对两种材料的塞贝克系数、电导率和导热率进行了表征，范围从100到900?C在空气中。最高zT为0.10，在900?Ca0.98La0.02MnO3-?得到C。高zT归因于增强的电子导电性(?90s /cm, 900°C)。Ba0.98La0.02MnO3-?在800℃时达到最高值(0.02)。C对应于低电子导电性(?2 S/cm)，导热系数较Ca0.98La0.02MnO3-?达到1W/(m?K)，塞贝克系数高达290v /K。目前的数据为进一步开发这些材料在热电器件中的应用提供了有价值的基础。

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