Rapid fabrication of pure p-type filled skutterudites with enhanced thermoelectric properties via a reactive liquid-phase sintering
Source abstract
Abstract
Filled skutterudites have great potential for power generation. However, the conventional melting–quenching–annealing–sintering process requires a time-consuming annealing process to accomplish the phase transformation. A new strategy to realize the complete phase transformation in a short time is an urgent need for filled skutterudite. In this study, a modifying reactive liquid-phase sintering enabled by introducing the extra BaSb3 in the spark plasma sintering process was successfully applied to fabricate pure BaFe4Sb12 skutterudites in less than 30 h. It is found that increasing BaSb3 liquid content can effectively promote the phase transformation to BaFe4Sb12 skutterudite through accelerating the chemical reaction between the quenched mixtures during the sintering process. However, an abnormal grain growth would take place with further increasing the liquid content. An optimal ZT value of 0.62 at 800 K was achieved for the BaFe4Sb12 skutterudite due to the enhanced Seebeck coefficient and the increased electrical conductivity as well as the decreased lattice thermal conductivity induced by the single-phase composition. This work demonstrates that pure filled skutterudite with enhanced TE performance can be fabricated by the simple and efficient reactive liquid-phase sintering without longtime annealing process.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
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