Optimization and Analysis of Thermoelectric Properties of Unfilled Co1-x-yNixFeySb3 Synthesized via a Rapid Hydrothermal Procedure

Ahmad Gharleghi, Yu Hsien Chu, Fei Hung Lin, Zong Ren Yang, Yi Hsuan Pai, Chia Jyi Liu

Research output: Contribution to journalArticle

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Abstract

A series of nanostructured co-doped Co1-x-yNixFeySb3 were fabricated using a rapid hydrothermal method at 170°C for a duration of 12 h, followed by evacuated-and-encapsulated heating at 580°C for a short period of 5 h. The resulting samples were characterized using powder X-ray diffraction, field emission scanning electron microscopy, bulk density, electronic and thermal transport measurements. The power factor of Co1-x-yNixFeySb3 is significantly enhanced in the high-temperature region due to significant enhancement of the electrical conductivity and absolute value of thermopower. The latter arises from the onset of bipolar effect being shifted to higher temperatures as compared with the non-doped CoSb3. The room temperature thermal conductivity falls in the range between 1.22 and 1.67 W m-1 K-1 for Co1-x-yNixFeySb3. The thermal conductivity of both the (x,y) = (0.14,10) and (0.14,12) samples is measured up to 600 K and found to decrease with increasing temperature. The thermal conductivity of the (0.14,10) sample goes down to ∼1.02 W m-1 K-1. As a result, zT = 0.68 is attained at 600 K. The lattice thermal conductivity is analyzed to gain insight into the contribution of various scattering processes that suppress the heat transfer through the phonons in Co1-x-yNixFeySb3. The effect of the simultaneous presence of Co, Ni, and Fe elements on the electronic structure and transport properties of Co1-x-yNixFeySb3 is described using the quantum mechanical tunneling theory of electron transmission among the potential barriers.

Original languageEnglish
Pages (from-to)5205-5215
Number of pages11
JournalACS Applied Materials and Interfaces
Volume8
Issue number8
DOIs
Publication statusPublished - 2016 Mar 2

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Thermal conductivity
Electron transport properties
Temperature
Thermoelectric power
Phonons
Field emission
X ray powder diffraction
Electronic structure
Scattering
Heat transfer
Heating
Scanning electron microscopy
Electrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Gharleghi, Ahmad ; Chu, Yu Hsien ; Lin, Fei Hung ; Yang, Zong Ren ; Pai, Yi Hsuan ; Liu, Chia Jyi. / Optimization and Analysis of Thermoelectric Properties of Unfilled Co1-x-yNixFeySb3 Synthesized via a Rapid Hydrothermal Procedure. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 8. pp. 5205-5215.
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abstract = "A series of nanostructured co-doped Co1-x-yNixFeySb3 were fabricated using a rapid hydrothermal method at 170°C for a duration of 12 h, followed by evacuated-and-encapsulated heating at 580°C for a short period of 5 h. The resulting samples were characterized using powder X-ray diffraction, field emission scanning electron microscopy, bulk density, electronic and thermal transport measurements. The power factor of Co1-x-yNixFeySb3 is significantly enhanced in the high-temperature region due to significant enhancement of the electrical conductivity and absolute value of thermopower. The latter arises from the onset of bipolar effect being shifted to higher temperatures as compared with the non-doped CoSb3. The room temperature thermal conductivity falls in the range between 1.22 and 1.67 W m-1 K-1 for Co1-x-yNixFeySb3. The thermal conductivity of both the (x,y) = (0.14,10) and (0.14,12) samples is measured up to 600 K and found to decrease with increasing temperature. The thermal conductivity of the (0.14,10) sample goes down to ∼1.02 W m-1 K-1. As a result, zT = 0.68 is attained at 600 K. The lattice thermal conductivity is analyzed to gain insight into the contribution of various scattering processes that suppress the heat transfer through the phonons in Co1-x-yNixFeySb3. The effect of the simultaneous presence of Co, Ni, and Fe elements on the electronic structure and transport properties of Co1-x-yNixFeySb3 is described using the quantum mechanical tunneling theory of electron transmission among the potential barriers.",
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Optimization and Analysis of Thermoelectric Properties of Unfilled Co1-x-yNixFeySb3 Synthesized via a Rapid Hydrothermal Procedure. / Gharleghi, Ahmad; Chu, Yu Hsien; Lin, Fei Hung; Yang, Zong Ren; Pai, Yi Hsuan; Liu, Chia Jyi.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 8, 02.03.2016, p. 5205-5215.

Research output: Contribution to journalArticle

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T1 - Optimization and Analysis of Thermoelectric Properties of Unfilled Co1-x-yNixFeySb3 Synthesized via a Rapid Hydrothermal Procedure

AU - Gharleghi, Ahmad

AU - Chu, Yu Hsien

AU - Lin, Fei Hung

AU - Yang, Zong Ren

AU - Pai, Yi Hsuan

AU - Liu, Chia Jyi

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N2 - A series of nanostructured co-doped Co1-x-yNixFeySb3 were fabricated using a rapid hydrothermal method at 170°C for a duration of 12 h, followed by evacuated-and-encapsulated heating at 580°C for a short period of 5 h. The resulting samples were characterized using powder X-ray diffraction, field emission scanning electron microscopy, bulk density, electronic and thermal transport measurements. The power factor of Co1-x-yNixFeySb3 is significantly enhanced in the high-temperature region due to significant enhancement of the electrical conductivity and absolute value of thermopower. The latter arises from the onset of bipolar effect being shifted to higher temperatures as compared with the non-doped CoSb3. The room temperature thermal conductivity falls in the range between 1.22 and 1.67 W m-1 K-1 for Co1-x-yNixFeySb3. The thermal conductivity of both the (x,y) = (0.14,10) and (0.14,12) samples is measured up to 600 K and found to decrease with increasing temperature. The thermal conductivity of the (0.14,10) sample goes down to ∼1.02 W m-1 K-1. As a result, zT = 0.68 is attained at 600 K. The lattice thermal conductivity is analyzed to gain insight into the contribution of various scattering processes that suppress the heat transfer through the phonons in Co1-x-yNixFeySb3. The effect of the simultaneous presence of Co, Ni, and Fe elements on the electronic structure and transport properties of Co1-x-yNixFeySb3 is described using the quantum mechanical tunneling theory of electron transmission among the potential barriers.

AB - A series of nanostructured co-doped Co1-x-yNixFeySb3 were fabricated using a rapid hydrothermal method at 170°C for a duration of 12 h, followed by evacuated-and-encapsulated heating at 580°C for a short period of 5 h. The resulting samples were characterized using powder X-ray diffraction, field emission scanning electron microscopy, bulk density, electronic and thermal transport measurements. The power factor of Co1-x-yNixFeySb3 is significantly enhanced in the high-temperature region due to significant enhancement of the electrical conductivity and absolute value of thermopower. The latter arises from the onset of bipolar effect being shifted to higher temperatures as compared with the non-doped CoSb3. The room temperature thermal conductivity falls in the range between 1.22 and 1.67 W m-1 K-1 for Co1-x-yNixFeySb3. The thermal conductivity of both the (x,y) = (0.14,10) and (0.14,12) samples is measured up to 600 K and found to decrease with increasing temperature. The thermal conductivity of the (0.14,10) sample goes down to ∼1.02 W m-1 K-1. As a result, zT = 0.68 is attained at 600 K. The lattice thermal conductivity is analyzed to gain insight into the contribution of various scattering processes that suppress the heat transfer through the phonons in Co1-x-yNixFeySb3. The effect of the simultaneous presence of Co, Ni, and Fe elements on the electronic structure and transport properties of Co1-x-yNixFeySb3 is described using the quantum mechanical tunneling theory of electron transmission among the potential barriers.

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