The Synthesis and Thermoelectric Properties of m class="a-plus-plus">pm>-Type Li_{1−m class="a-plus-plus">xm>} NbO₂-Based Compounds

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• 作者：Jamil Ur Rahman ; Eun-Ji Meang ; Du Van Nguyen…
• 关键词：Thermoelectric ; electrical conductivity ; lithium niobium oxide ; thermal property
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：46
• 期：3
• 页码：1740-1746
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

We investigated the thermoelectric (TE) properties of a p-type oxide material (Li_{1−m class="EmphasisTypeItalic ">x}NbO₂, with x = 0–0.6). The composition was synthesized via a solid-state reaction method under a reducing atmosphere. The charge transport properties were determined through the electrical conductivity and Seebeck coefficient measurements. The electrical conductivity was non-monotonically varied with x value and showed metallic behavior with increased temperature and above 650 K temperature independent behavior dominated by extrinsic conduction. On the other hand, the Seebeck coefficient was increased with an increase in the temperature, and decreased gradually with an increase in the Li vacancy concentration by both synthesis and gradual phase transition to a Li-rich Li₃NbO₄ phase with temperature and appeared as an n-type TE at x = 0.6 under high temperatures, which was attributed to an Nb substitution into the Li site. The thermal conductivity was monotonically reduced with the increase in temperature due to the cation disorder defects and second phases. The Li vacancy induced Li_{1−m class="EmphasisTypeItalic ">x}NbO₂-based compounds under low oxygen partial pressure show promise as a candidate p-type material for thermoelectric applications, particularly for co-processing with n-type oxide thermoelectric materials fabricated under conditions of low oxygen partial pressure.