Effects of TiB2 addition on spark plasma sintering and thermoelectric performance of Y-doped SrTiO3 synthesized by polymerized complex process

In the present study, the TiO2-Ti compacts with Magneli phases TinO2n-1 were fabricated using the mixed powder of TiO2 powder and addition Ti powder by spark plasma sintering (SPS). The composition and the crystal types of Magneli phases TinO2n-1 were examined. The results showed that various Magneli phases TinO2n-1 (single or multi Magneli phases) with the composition of Ti1+yO2-x were obtained. The Magneli phases TinO2n-1 were formed in the transformation from the mother phase rutile TiO2 to TiO with increase in Ti addition fraction. In addition, the thermoelectric properties of the sintered compacts were also measured. The electrical resistivity of the sintered compacts decreased with increase in Ti addition fraction. The thermoelectric performance of the sintered compacts was improved by the formation of Magneli phases TinO2n-1 with the composition of Ti1+yO2-x.

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Thermoelectric performance enhancement of Cu2S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

Journal of Materials Chemistry C ◽

10.1039/c7tc01937h ◽

2017 ◽

Vol 5 (31) ◽

pp. 7845-7852 ◽

Cited By ~ 30

Author(s):

Yao Yao ◽

Bo-Ping Zhang ◽

Jun Pei ◽

Yao-Chun Liu ◽

Jing-Feng Li

Keyword(s):

Thermal Conductivity ◽

Mechanical Alloying ◽

Spark Plasma Sintering ◽

Power Factor ◽

Performance Enhancement ◽

Thermoelectric Performance ◽

Plasma Sintering ◽

Se Doping ◽

Spark Plasma

A series of single-phased Cu2S1−xSex bulks were prepared by using mechanical alloying (MA) combined with spark plasma sintering (SPS). Our results suggest that the TE properties of Cu2S can be greatly enhanced by simultaneously increasing PF and decreasing κ via doping a sole Se element.

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Thermoelectric performance of textured Bi2Te 3-based sintered materials prepared by spark plasma sintering

MRS Proceedings ◽

10.1557/proc-793-s9.3 ◽

2003 ◽

Vol 793 ◽

Cited By ~ 2

Author(s):

Lidong Chen ◽

Jun Jiang ◽

Xun Shi

Keyword(s):

Spark Plasma Sintering ◽

Bending Strength ◽

Thermoelectric Performance ◽

Polycrystalline Materials ◽

Plasma Sintering ◽

Grain Orientations ◽

Thermoelectric Transport Properties ◽

Spark Plasma ◽

P Type ◽

Sintered Materials

ABSTRACTThermoelectric performance of polycrystalline materials is greatly influenced by their microstructures including grain sizes, grain boundaries, grain orientations in anisotropic compounds, etc. The material microstructures are sensitive to the preparation processes and the starting materials. In the present study, n-type and p-type Bi2Te3-based sintered materials with highly preferred grain orientations have been fabricated through a spark plasma sintering (SPS) technique, by controlling the particle sizes of the starting powder and other sintering process parameters. The obtained textured Bi2Te3-based materials show a high mechanical strength as 80MPa in bending strength, which is 7 to 8 times as that of the melted ingot materials, and a significant anisotropy in thermoelectric transport properties. The optimal figure of merit (ZT) of the sintered materials in the direction perpendicular to the pressing direction (with c-axis preferred orientation) is comparable to that of the zone-melted ingots in the same crystallographic orientation.

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