研究目的
Investigating the effects of liquid state manipulation (LSM) combined with ball milling and spark plasma sintering processes on the thermoelectric properties of n-type Bi2Te3 alloy.
研究成果
The combination of LSM with BM and SPS processes significantly enhances the thermoelectric performance of n-type Bi2Te3 alloy by improving electrical conductivity and reducing lattice thermal conductivity, leading to a peak zT of 0.66 at 475 K.
研究不足
The study focuses on undoped n-type Bi2Te3 bulks and the specific effects of LSM, which may not be directly applicable to other materials or doping conditions.
1：Experimental Design and Method Selection:
The study involved preparing undoped n-type Bi2Te3 bulks via LSM followed by ball milling and spark plasma sintering processes.
2：Sample Selection and Data Sources:
Pure Bi and Te granules were used according to the stoichiometric proportion of Bi2Te
3：List of Experimental Equipment and Materials:
Equipment included a chamber electric oven, ball mill (QM-4), and spark plasma sintering (SPS, LABOX-350).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The mixture was melted at different temperatures (with and without LSM), subjected to ball milling, and then sintered by SPS.
5：Data Analysis Methods:
Electrical and thermal transport properties were measured, and microstructures were characterized using XRD, FE-SEM, FE-TEM, and EDS.
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ball mill
QM-4
Changsha Tianchuang Powder Technology Co. Ltd.
Used for breaking solidified ingots into particles.
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X-ray diffraction
D/MAX2500 V
Rigaku
Used for characterizing the crystal structures of powders and bulks.
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field-emission scanning electron microscope
SU8020
Hitachi
Used for characterizing microstructures and elemental ratios of powders and bulks.
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energy-dispersive spectrometer
Inca
Oxford instruments
Used for characterizing microstructures and elemental ratios of powders and bulks.
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spark plasma sintering
LABOX-350
Sinter Land Inc.
Used for sintering powders into bulks.
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field-emission transmission electron microscope
JEM-2100F
Japan
Used for characterizing microstructures and elemental ratios of powders and bulks.
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