Eutectic microstructures and thermoelectric properties of MnTe-rich precipitates hardened PbTe

Eutectic microcosmic characteristics, mechanical and thermoelectric properties are studied in Pb1−xMnxTe beyond the Mn solubility limit. Particle-like MnTe2 and lamellar MnTe precipitates are spontaneously formed, presumably due to the precipitate-matrix lattice misfit. MnTe-rich precipitates in PbT...

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Bibliographic Details
Published in:Acta materialia 2016-06, Vol.111, p.202-209
Main Authors: Zhang, Yu, Wu, Lihua, Zhang, Jiye, Xing, Juanjuan, Luo, Jun
Format: Article
Language:English
Subjects:
Eutectic microstructure
Eutectic temperature
Intermetallics
Lead base alloys
Lead telluride
Lead tellurides
Microstructure
Precipitate hardening
Precipitates
Precipitation
Thermoelectric materials
Thermoelectricity
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Summary:Eutectic microcosmic characteristics, mechanical and thermoelectric properties are studied in Pb1−xMnxTe beyond the Mn solubility limit. Particle-like MnTe2 and lamellar MnTe precipitates are spontaneously formed, presumably due to the precipitate-matrix lattice misfit. MnTe-rich precipitates in PbTe can improve the mechanical properties without significant impact on the thermoelectric performance. Band degeneracy effect and additional phonon scattering by discontinued particle-like precipitates prompt a high figure of merit ZT of 1.5 in Pb0.94Mn0.06Te. Though continuum ordered lamellar precipitates lead to larger electrical resistivity and anomalous increase of lattice thermal conductivity, the average ZT (≈0.8) in Pb1−xMnxTe (0.12 ≤ x ≤ 0.36) is still comparable with PbTe (all doped by 2% Na). Such precipitation hardening by eutectic microstructures without strongly influencing the thermoelectric performance can be promising for thermoelectric applications. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2016.03.059