Year: 2025
Type: article
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 GeMnTe1.96.GeMnTe1.96achieved 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.
Source: Journal of Inorganic Materials
DOI: 10.15541/jim20250036
Authors: Haifeng ZHANG, Meng JIANG, Tingting SUN, Lianjun WANG, Wan JIANG
Institution: Donghua University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409460576