scholarly journals Thermoelectric Transport Properties of Cu Nanoprecipitates EmbeddedBi2Te2.7Se0.3

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Eunsil Lee ◽  
Jin Il Kim ◽  
Soon-Mok Choi ◽  
Young Soo Lim ◽  
Won-Seon Seo ◽  
...  
Keyword(s):  
Power Factor ◽  
Colloidal Suspension ◽  
Raw Material ◽  
Mixed Powder ◽  
Thermoelectric Transport ◽  
Plasma Sintering ◽  
Thermoelectric Transport Properties ◽  
Spark Plasma ◽  
Scalable Synthesis ◽  
Filtering Effect

We suggest a simple and scalable synthesis to prepare Cu-Bi2Te2.7Se0.3(Cu-BTS) nanocomposites. By precipitating Cu nanoparticle (NP) in colloidal suspension of as-exfoliated BTS, homogeneous mixtures of Cu NP and BTS nanosheet were readily achieved, and then the sintered nanocomposites were fabricated by spark plasma sintering technique using the mixed powder as a raw material. The precipitated Cu NPs in the BTS matrix effectively generated nanograin (BTS) and heterointerface (Cu/BTS) structures. The maximumZTof 0.90 at 400 K, which is 15% higher compared to that of pristine BTS, was obtained in 3 vol% Cu-BTS nanocomposite. The enhancement ofZTresulted from improved power factor by carrier filtering effect due to the Cu nanoprecipitates in the BTS matrix.

scholarly journals Fabrication and characterization of nanostructured thermoelectric FexCo1-xSb3

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Mohsen Yakshi Tafti ◽  
Mohsin Saleemi ◽  
Muhammet S. Toprak ◽  
Mats Johnsson ◽  
Alexandre Jacquot ◽  
...  
Keyword(s):  
Metallic Behavior ◽  
Synthesis Route ◽  
Plasma Sintering ◽  
Thermoelectric Transport Properties ◽  
Thermochemical Processes ◽  
Spark Plasma ◽  
Improved Performance ◽  
Scalable Synthesis ◽  
Co Precipitation ◽  
P Type

AbstractA novel synthesis route for the fabrication of p-type nanostructured skutterudite, FexCo1-xSb3 in large quantity is reported. This scalable synthesis route provides nano-engineered material with less impact on the environment compared to conventional synthesis procedures. Several Fe substituted compositions have been synthesized to confirm the feasibility of the process. The process consists of a nano-sized precursor fabrication of iron and cobalt oxalate, and antimony oxides by chemical co-precipitation. Further thermochemical processes result in the formation of iron substituted skutterudites. The nanopowders are compacted by Spark Plasma Sintering (SPS) technique in order to maintain nanostructure. Detailed physicochemical as well as thermoelectric transport properties are evaluated. Results reveal strongly reduced thermal conductivity values compared to conventionally prepared counterparts, due to nanostructuring. P-type characteristic was observed from the Seebeck measurements while electrical conductivity is high and shows metallic behavior. The highest TE figure of merit of 0.25 at 800 K has been achieved, which is strongly enhanced with respect to the mother compound CoSb3. This suggests the promise of the utilized method of fabrication and processing for TE applications with improved performance.

Effects of Cl-Doping on Thermoelectric Transport Properties of Cu2Se Prepared by Spark Plasma Sintering

2018 ◽  
Vol 48 (4) ◽  
pp. 1958-1964 ◽  
Author(s):  
Min Ji Kim ◽  
Gil-Geun Lee ◽  
Woochul Kim ◽  
Kyomin Kim ◽  
Jang-Yeul Tak ◽  
...  
Keyword(s):  
Transport Properties ◽  
Spark Plasma Sintering ◽  
Thermoelectric Transport ◽  
Plasma Sintering ◽  
Thermoelectric Transport Properties ◽  
Spark Plasma

scholarly journals Hf-Doping Effect on the Thermoelectric Transport Properties of n-Type Cu0.01Bi2Te2.7Se0.3

2020 ◽  
Vol 10 (14) ◽  
pp. 4875
Author(s):  
Jeong Yun Hwang ◽  
Sura Choi ◽  
Sang-il Kim ◽  
Jae-Hong Lim ◽  
Soon-Mok Choi ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Figure Of Merit ◽  
Phonon Scattering ◽  
Mass Difference ◽  
Solidification Process ◽  
Transport Parameters ◽  
Plasma Sintering ◽  
Thermoelectric Transport Properties ◽  
Spark Plasma ◽  
Melt Solidification

Polycrystalline bulks of Hf-doped Cu0.01Bi2Te2.7Se0.3 are prepared via a conventional melt-solidification process and subsequent spark plasma sintering technology, and their thermoelectric performances are evaluated. To elucidate the effect of Hf-doping on the thermoelectric properties of n-type Cu0.01Bi2Te2.7Se0.3, electronic and thermal transport parameters are estimated from the measured data. An enlarged density-of-states effective mass (from ~0.92 m0 to ~1.24 m0) is obtained due to the band modification, and the power factor is improved by Hf-doping benefitting from the increase in carrier concentration while retaining carrier mobility. Additionally, lattice thermal conductivity is reduced due to the intensified point defect phonon scattering that originated from the mass difference between Bi and Hf. Resultantly, a peak thermoelectric figure of merit zT of 0.83 is obtained at 320 K for Cu0.01Bi1.925Hf0.075Te2.7Se0.3, which is a ~12% enhancement compared to that of the pristine Cu0.01Bi2Te2.7Se0.3.

Fabrication and Thermoelectric Properties of Magneli Phases by Adding Ti into TiO2

2011 ◽  
Vol 415-417 ◽  
pp. 1291-1296 ◽  
Author(s):  
Yun Lu ◽  
Yusuke Matsuda ◽  
Katsuhiro Sagara ◽  
Liang Hao ◽  
Takahito Otomitsu ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Spark Plasma Sintering ◽  
Thermoelectric Properties ◽  
Thermoelectric Performance ◽  
Mixed Powder ◽  
Magnéli Phases ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ti Powder ◽  
Ti Addition

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.

Fabrication of Mo-Ti3SiC2 Layered Material by Spark Plasma Sintering and its Interface Stability at 800°C

2010 ◽  
Vol 638-642 ◽  
pp. 973-978
Author(s):  
Tungwai Leo Ngai ◽  
Hui Guo Luo ◽  
Jun Jun Zheng ◽  
Chang Xu Hu ◽  
Yuan Yuan Li
Keyword(s):  
Spark Plasma Sintering ◽  
Layered Composite ◽  
Layered Material ◽  
Molar Ratio ◽  
Mixed Powder ◽  
Growing Period ◽  
Intermediate Layers ◽  
Plasma Sintering ◽  
Heat Treated ◽  
Spark Plasma

Mo-Ti3SiC2 layered material was prepared by spark plasma sintering. Mixed Ti, Si, graphite and Al powder with molar ratio of 3Ti:1Si:2C:0.2Al was put into a graphite mould and pressed with a pressure of about 0.5 MPa, then, Mo powder was put on top of the mixed powder. Experimental results showed that Mo-Ti3SiC2 layered material could be fabricated successfully by sintering the above powder mixture at 1300°C for 20 minutes under a pressure of 50 MPa in vacuum. The surface and interfaces of the layered composite were tight and clear without any observable crack. In order to study the thermal stability at elevated temperature, the fabricated Mo-Ti3SiC2 layered composite was heat treated at 800°C for 5, 10, 20 and 40 hours. After 40 hours of annealing, the intermediate layers formed between the Mo and Ti3SiC2 matrix grew thicker. The interfaces are clean and tight with no obvious formation of voids and new phases. The initial 10 hours of annealing is the fast growing period, after that, the growth rate slowed down significantly.

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

2017 ◽  
Vol 5 (31) ◽  
pp. 7845-7852 ◽  
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.

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

2003 ◽  
Vol 793 ◽  
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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