Thermoelectric properties of Ca_{1鈭?span style='font-style: italic'>x}Sr_xRuO₃ compounds prepared by spark plasma sintering

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• 作者：Nittaya Keawprak ; Rong Tu ; ^{turong@imr.tohoku.ac.jp} ; Takashi Goto
• 关键词：Thermoelectric material ; Strontium ruthenate ; Calcium ruthenate ; Solid solution ; Spark plasma sintering
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 May, 2012
• 卷：523
• 期：Complete
• 页码：182-187
• 文件大小：1178 K

摘要

Single phase Ca_1鈭?em>xSr_xRuO₃ (x = 0-1.0) powders were synthesized by a solid-state reaction and compacted by spark plasma sintering. The a-length of the lattice parameter showed a slight minimum around x = 0.6, whereas the b-length, c-length and the unit cell volume increased continuously with increasing x from 0 to 1.0, indicating a solid solution in the whole range. The relative density of Ca_1鈭?em>xSr_xRuO₃ compacted bodies increased from 75 to 95%with increasing x from 0 to 1.0. The electrical conductivity (蟽) at x = 0.1-0.9 was higher than those of the end members (CaRuO₃ and SrRuO₃) except for that at x = 0.5, and showed metallic conduction at all compositions. The Seebeck coefficient (S) was 30-40 渭V K^鈭?, almost independent of composition and temperature. The thermal conductivity (魏) was 2-3 W m^鈭? K^鈭? at room temperature and increased with increasing temperature. The 魏 showed the lowest values at x = 0.2 in the whole temperature range. The dimensionless figure-of-merit (ZT) at x = 0.1-0.9 was higher than those of the end members. The highest ZT was 0.07 at x = 0.2 and 600 K.