稳定立方相p型 GeMnTe2 基热电材料制备

doi:10.15541/jim20250036

摘要/Abstract

摘要： p型GeTe基热电材料在中低温区(300~800 K)具有良好的热电性能,受到了研究者的广泛关注。然而,在600~700 K温度区间,该化合物易从菱方相转变到立方相,导致热膨胀系数变化,限制了其在热电器件领域的应用。因此,获得稳定无相变的GeTe基热电材料至关重要。本研究利用高温熔融结合放电等离子体烧结制备了GeMnTe₂材料。合成的样品存在MnTe₂第二相,导致其总热导率从800 K下的1.34 W·m^-1·K^-1增大到1.81 W·m^-1·K^-1。本研究通过优化不同元素化学计量比,抑制了MnTe₂第二相的生成,制备获得了稳定立方相GeMnTe_1.96材料。制备的GeMnTe_1.96化合物样品最高zT值达到0.85(800 K),这为中温区废热高效稳定回收利用提供了有发展潜力的热电材料。

关键词: 高温熔融, 立方相, GeMnTe₂基化合物, 热导率

Abstract: p-type GeTe based thermoelectric (TE) materials have attracted significant attention owing to their remarkable TE performance in the medium and low temperature range (300~800 K). However, the material undergoes a phase transition from rhombohedral to cubic in 600~700 K, inducing changes in the coefficient of thermal expansion that limit its application in TE devices. Consequently, it is imperative to develop stable GeTe based thermoelectric material free from phase transitions. In this study, high temperature melting combined with spark plasma sintering was employed to synthesize GeMnTe₂. The as-synthesized samples contain the secondary phase of MnTe₂, which increases the total thermal conductivity from 1.34 W·m⁻¹·K⁻¹ to 1.81 W·m⁻¹·K⁻¹ at 800 K. By optimizing the chemical stoichiometry of different elements, the formation of MnTe₂ secondary phase was suppressed, resulting in the stable pure cubic phase GeMnTe_1.96. GeMnTe_1.96 achieved the maximum zT of 0.85 at 800 K. This thermoelectric material exhibited significant potential for efficient and stable waste heat utilization in the medium temperature range.

Key words: high temperature melting, cubic phase, GeMnTe₂ based compound, thermal conductivity

中图分类号:

TQ174

张海丰, 蒋蒙, 孙婷婷, 王连军, 江莞. 稳定立方相p型 GeMnTe₂ 基热电材料制备[J]. 无机材料学报, DOI: 10.15541/jim20250036.

ZHANG Haifeng, JIANG Meng, SUN Tingting, WANG Lianjun, JIANG Wan. Preparation of p-type GeMnTe₂ based Thermoelectric Materials with Stable Cubic Phase[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250036.

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稳定立方相p型 GeMnTe₂ 基热电材料制备

Preparation of p-type GeMnTe₂ based Thermoelectric Materials with Stable Cubic Phase

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