研究目的
Investigating the effects of Te substitution on the structure and thermoelectric properties of argyrodite-like Cu8GeSe6.
研究成果
Te substitution in Cu8GeSe6 leads to a structure change and improved thermoelectric properties, with Cu8GeSe4Te2 showing a higher figure of merit. The study also explores heterostructuring with GST materials, suggesting potential for further optimization.
研究不足
The study is limited by the decomposition of samples at temperatures above 350 °C and the size distribution of precipitates in heterostructured systems, which may affect thermoelectric performance.
1：Experimental Design and Method Selection:
The study involved the synthesis of Cu8GeSe6–xTex compounds through fusion of elements and crystal growth by annealing. Structural characterization was performed using single-crystal and powder X-ray diffraction, including high-temperature measurements. Thermoelectric properties were measured using various techniques.
2：Sample Selection and Data Sources:
Samples were synthesized from high-purity elements, and their compositions were verified by EDX spectroscopy.
3：List of Experimental Equipment and Materials:
Instruments included a Huber G670 diffractometer, Philips CM-200 STEM, SEM LEO 1530 Gemini, and Linseis LSR-3 and LFA1000 for thermoelectric measurements.
4：Experimental Procedures and Operational Workflow:
Synthesis involved stepwise heating and quenching, followed by crystal growth and annealing. Structural and thermoelectric properties were characterized at various temperatures.
5：Data Analysis Methods:
Data were analyzed using Rietveld refinement, effective mass modeling, and other computational tools.
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