Morphology and thermoelectric performance of bulk sodium tungsten bronze prepared via low energy-consuming route
Source abstract
Abstract
Metal oxides are one of the promising thermoelectric (TE) materials due to their high-temperature stability, low cost, and non-toxicity. Sodium tungsten bronze (STB), NaxWO3, is known to possess high electrical conductivity but the TE performance has not been thoroughly examined. In this study, STB was synthesized via a reduction reaction (RR) and a solid-state reaction (SSR) followed by hot pressing (HP) and spark plasma sintering (SPS). The obtained STB bulk samples have a cubic structure and the composition x of 0.41–0.47. A nanostructure was observed in the sintered RR samples. The RR-SPS sample was composed of several hundred nanometer-sized cubic particles with high porosity. Such morphology resulted in the low thermal conductivity of 6.6 W m−1 K−1 at 800 °C. As a result, the dimensionless figure of merit, ZT, of the RR-SPS sample was higher than those of the dense samples sintered by HP with the maximum ZT of 0.019 at 800 °C.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electronic Packaging and Soldering Technologies · Metallurgical and Alloy Processes · Copper Interconnects and Reliability
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
Transdisciplinary Research and Education Center for Green Technologies, Kyushu University
References (32)
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