Enhanced thermoelectric properties by effective decoupling of electrical, thermal properties and seebeck coefficient through the addition of rare earth sesquioxides in p-type BiSbTe alloys

ABSTRACTThe phase relationships and the important structural, electrical and thermal properties of the R3X4-R2X3 (where R = lanthanides and X = S, Se and Te) phases having the Th3P4 -type structure are reviewed. The room temperature electrical resistivity and Seebeck coefficient of these materials are independent of R and only slightly dependent on X, but critically dependent on the X:R ratio. The long term stability of these phases is also reviewed. Although these materials have good thermoelectric properties there are some problems which need to be solved before these phases can be utilized in thermoelectric devices. These problems include long term stability, higher than desirable thermal conductivities, and low electron mobilities.

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Влияние легирования ванадием на термоэлектрические свойства сплавов Гейслера Fe-=SUB=-2-=/SUB=-Ti-=SUB=-1-x-=/SUB=-V-=SUB=-x-=/SUB=-Sn

Физика и техника полупроводников ◽

10.21883/ftp.2019.06.47727.36 ◽

2019 ◽

Vol 53 (6) ◽

pp. 777

Author(s):

А.И. Таранова ◽

А.П. Новицкий ◽

А.И. Воронин ◽

С.В. Таскаев ◽

В.В. Ховайло

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Experimental Study ◽

Seebeck Coefficient ◽

Transport Properties ◽

Thermoelectric Properties ◽

Pristine Sample ◽

Electrical Conductivity Behavior ◽

P Type ◽

Conductivity Behavior

In this work the results of an experimental study of Fe2Ti1-xVxSn alloys (x = 0; 0.06; 0.15; 0.2) are presented. According to the temperature dependencies of the electrical conductivity, Seebeck coefficient and thermal conductivity, it is established, that the studied compositions exhibit transport properties typical for semiconductors. The substitution of V at the Ti site leads to a change of the p-type electrical conductivity behavior to n-type; the pristine sample of Fe2TiSn has the best thermoelectric properties.

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Synthesis and High Temperature Thermoelectric Properties of Alkaline-Earth Metal Hexaborides MB6 (M=Ca, Sr, Ba)

MRS Proceedings ◽

10.1557/proc-793-s8.11 ◽

2003 ◽

Vol 793 ◽

Cited By ~ 4

Author(s):

Masatoshi Takeda ◽

Yosuke Kurita ◽

Keisuke Yokoyama ◽

Takahiro Miura ◽

Tsuneo Suzuki ◽

...

Keyword(s):

Electrical Conductivity ◽

High Temperature ◽

Seebeck Coefficient ◽

Carrier Concentration ◽

Thermoelectric Properties ◽

Alkaline Earth ◽

Earth Metal ◽

Thermoelectric Device ◽

Alloying Effect ◽

P Type

ABSTRACTPolycrystalline alkaline-earth hexaborides (MB6: M =Ca, Sr, Ba) were synthesized and their thermoelectric and transport properties were examined to discuss their possibility as high temperature thermoelectric materials. Hall measurements showed that carrier concentration of the BaB6 was the highest among the three hexaborides and that of CaB6 was the lowest. Substitution of part of the alkaline earth metals with one of the others changed the carrier concentration of the hexaboride. As the carrier concentration increased, Seebeck coefficient increased and electrical conductivity decreased. These results suggest that the thermoelectric properties of the divalent hexaborides depend largely on the carrier concentration, and optimum carrier concentration which gives maximum power factor was estimated to be approximately 2x1026 m−3. Consequently, such a substitution enables us to control Seebeck coefficient and electrical conductivity of the hexaborides, and will also be effective to reduce the lattice heat conduction due to the alloying effect. A thermoelectric device was fabricated using SrB6 and boron carbide thin films as n-type and p-type elements, respectively. To the best of our knowledge, this is the first demonstration of a thermoelectric device composed of only boron-rich solids.

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ELECTRICAL CONDUCTING AND THERMOELECTRIC PROPERTIES OF Ba4Na2Nb10O30−Ba3NaLaNb10O30 SYSTEM

Modern Physics Letters B ◽

10.1142/s0217984990000854 ◽

1990 ◽

Vol 04 (10) ◽

pp. 681-688

Author(s):

MASAYUKI TSUKIOKA ◽

YASUO TANOKURA ◽

MASAZI SHIMAZU ◽

SHINICHIRO KUROIWA ◽

SADAO TSUTSUMI

Keyword(s):

Electrical Resistivity ◽

Seebeck Coefficient ◽

Thermoelectric Properties ◽

Solid Solutions ◽

Diffraction Measurement ◽

X Ray Diffraction ◽

X Ray ◽

Ceramic Samples ◽

Electrical Conducting ◽

P Type

Ceramic samples of BNN-BNLN ( Ba 4 Na 2 Nb 10 O 30− Ba 3 NaLaNb 10 O 30) system were prepared in flowing N 2 gas at about 1410°C, which has been confirmed to have continuous solid solutions over the whole range of BNN-BNLN system by X-ray diffraction measurement. Electrical resistivity and Seebeck coefficient measurements were carried out at temperatures from 77 K to 773 K and from 60 K to 200 K, respectively for the samples of different composition belonging to the BNN-BNLN system. These experiments revealed that all these materials were extrinsic semiconductors and change from p-type semiconductors to n-type during the process of rising temperature.

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THERMOELECTRIC PROPERTIES OF p-TYPE SKUTTERUDITES (Pr0.25Nd0.75)xFe3CoSb12 BY LEVITATION MELTING AND SPARK PLASMA SINTERING

Functional Materials Letters ◽

10.1142/s1793604713400067 ◽

2013 ◽

Vol 06 (05) ◽

pp. 1340006 ◽

Cited By ~ 2

Author(s):

JINGSHU XU ◽

CHENGUANG FU ◽

JIAN XIE ◽

XINBING ZHAO ◽

TIEJUN ZHU

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Seebeck Coefficient ◽

Spark Plasma Sintering ◽

Thermoelectric Properties ◽

Lattice Thermal Conductivity ◽

Levitation Melting ◽

Plasma Sintering ◽

Spark Plasma ◽

P Type

The p-type skutterudite compounds of ( Pr 0.25 Nd 0.75)x Fe 3 CoSb 12 (x = 0.67–0.78) have been successfully synthesized by levitation melting followed by annealing and spark plasma sintering. The thermoelectric properties have been characterized by the measurements of Seebeck coefficient, electrical conductivity and thermal conductivity in the temperature range from 300 K to 850 K. The improvement in the thermoelectric properties was realized due to the reduction in the lattice thermal conductivity when the voids were partially filled by Pr 0.25 Nd 0.75. The maximum ZT value of ~ 0.83 for ( Pr 0.25 Nd 0.75)0.76 Fe 3 CoSb 12 was obtained at 700 K.

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The origin of the n-type behavior in rare earth borocarbide Y1−xB28.5C4

Dalton Transactions ◽

10.1039/c4dt01303d ◽

2014 ◽

Vol 43 (40) ◽

pp. 15048-15054 ◽

Cited By ~ 22

Author(s):

Takao Mori ◽

Toshiyuki Nishimura ◽

Walter Schnelle ◽

Ulrich Burkhardt ◽

Yuri Grin

Keyword(s):

Rare Earth ◽

Seebeck Coefficient ◽

Boron Carbide ◽

Density Of States ◽

P Type ◽

Carbide Inclusions

It was revealed that boron carbide inclusions were the origin of the p-type behavior in the Seebeck coefficient α previously observed for Y1−xB28.5C4 in contrast to Y1−xB15.5CN and Y1−xB22C2N, the long awaited n-type counterparts to boron carbide. Calculations show a pseudo gap-like structure in density of states and importance of the borocarbonitride network.

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Rare earth ytterbium enhanced thermoelectric properties of p-type Bi0.5Sb1.5Te3

Applied Physics Letters ◽

10.1063/1.5091577 ◽

2019 ◽

Vol 114 (12) ◽

pp. 123901

Author(s):

Haixu Qin ◽

Liangjun Xie ◽

Zongwei Zhang ◽

Dandan Qin ◽

Fengkai Guo ◽

...

Keyword(s):

Rare Earth ◽

Thermoelectric Properties ◽

P Type

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Thermal Conductivity and Thermoelectric Properties of Novel Rare Earth Boron-Rich Cluster Compounds; Discovery of first undoped n-type B12 icosahedral compound

MRS Proceedings ◽

10.1557/proc-0886-f11-14 ◽

2005 ◽

Vol 886 ◽

Author(s):

Takao Mori

Keyword(s):

Thermal Conductivity ◽

Rare Earth ◽

Thermoelectric Properties ◽

Thermoelectric Materials ◽

Homologous Series ◽

Cluster Compounds ◽

Rich Cluster ◽

Boron Cluster ◽

Seebeck Coefficients ◽

P Type

ABSTRACTNovel rare earth boron icosahedral compounds are investigated as potential high temperature thermoelectric materials. REB50-type compounds and a homologous series of RE-B-C(N) compounds were synthesized and the thermal conductivity and thermoelectric properties measured. Seebeck coefficients in excess of 200 μV/K are observed at temperatures above 1000 K for the REB50-type compounds. Strikingly, n-type behavior was observed for REB22C2N and REB17CN. Up to now, non-doped B12 icosahedral compounds like boron carbide have all been p-type. The discovery of an n-type compound is extremely important in terms of the potential development of this class of compounds as viable thermoelectric materials. Low thermal conductivities of κ < 0.03 W/cm/K at room temperature was observed for these rare earth boron cluster compounds. In comparison among the homologous series in which there are rare earth and B6 octahedra layers separated by an increasing number of B12 icosahedra layers, we observe that the thermal conductivity actually increases as the number of boron cluster layers increases. We find that the rare earth B12 icosahedral cluster compounds in which RE atoms occupy voids among the clusters generally appear to have lower thermal conductivity than boron cluster compounds which do not contain RE atoms.

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Fabrication and Thermoelectric Properties of p-Type Bi1Sb4Te7.5 Alloy Doped with Fe3O4

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.1086 ◽

2006 ◽

Vol 510-511 ◽

pp. 1086-1089 ◽

Cited By ~ 1

Author(s):

Wang Kee Min ◽

Chang Ho Lee ◽

Yong Ho Park ◽

Ik Min Park

Keyword(s):

Thermal Conductivity ◽

Electrical Conductivity ◽

Mechanical Alloying ◽

Seebeck Coefficient ◽

Thermoelectric Properties ◽

Power Factor ◽

Hall Effect Measurement ◽

Small Addition ◽

Z Value ◽

P Type

We investigated the effects of Fe3O4 (0~0.1 wt.%) on the thermoelectric properties of Bi1Sb4Te7.5 alloy prepared by mechanical alloying process. The Seebeck coefficient increased with Fe3O4 content, but the power factor decreased with Fe3O4 content because of the decreased electrical conductivity. The thermal conductivity decreased with Fe3O4. The carrier concentration measured by the Hall effect measurement decreased with Fe3O4. The thermal conductivity of 0.1 wt.% Fe3O4 alloy was 0.814 W/Km, 20%lower than that of Fe3O4 free alloy. As a result, the small addition of Fe3O4 improved the Z value owing to the decreased thermal conductivity by adding Fe3O4. The Z value of 0.01 wt.% Bi1Sb4Te7.5 alloy was 3.1×10-3 /K, the highest value among the prepared alloys.

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Влияние углеродных нанотрубок на термоэлектрические свойства сплавов Гейслера p- и n-типа

Физика и техника полупроводников ◽

10.21883/ftp.2022.02.51955.28 ◽

2022 ◽

Vol 56 (2) ◽

pp. 164

Author(s):

E.M. Elsehly ◽

A. El-Khouly ◽

Mohamed Asran Hassan ◽

А.П. Новицкий ◽

Д.Ю. Карпенков ◽

...

Keyword(s):

Experimental Data ◽

Carbon Nanotubes ◽

Electrical Conductivity ◽

Seebeck Coefficient ◽

Thermoelectric Properties ◽

Heusler Alloy ◽

Heusler Alloys ◽

Type Compound ◽

P Type

This paper presents the results of studying the effect of carbon nanotubes on thermoelectric properties of p-type (Nb0.6Ta0.4)0.8Ti0.2FeSb and n-type Ti0.5Zr0.25Hf0.25NiSn half Heusler alloys. The experimental data obtained indicate a strong effect of the carbon nanotubes on electrical conductivity and Seebeck coefficient of the n-type compound, while the changes in these properties in the p-type compound were significantly less. It is suggested that a possible reason for this difference is the formation of a conducting cluster of carbon nanotubes in the sample of the n-type Heusler alloy.

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