Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient

Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient

Ca-Co-O ceramics is typically p-type thermoelectric materials and possesses positive Seebeck coefficient. In this work, n-type Ca-Co-O ceramics with negative Seebeck coefficients were fabricated by sintering and annealing in a reducing atmosphere. The microstructures and thermoelectric properties of...

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Main Authors: Chunlin Gong, Zongmo Shi, Yi Zhang, Yongsheng Chen, Jiaxin Hu, Jianjun Gou, Mengjie Qin, Feng Gao
Format: Article
Language:English
Published: Elsevier 2018-06-01
Series:Results in Physics
Online Access:http://www.sciencedirect.com/science/article/pii/S2211379718305709
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spelling doaj-6a1d405b13654cf5bbdf970e629afd4f2020-11-25T01:18:35ZengElsevierResults in Physics2211-37972018-06-01912331238Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficientChunlin Gong0Zongmo Shi1Yi Zhang2Yongsheng Chen3Jiaxin Hu4Jianjun Gou5Mengjie Qin6Feng Gao7Shaanxi Aerospace Flight Vehicle Design Key Laboratory, School of Astronautics, Nothwestern Polytechnical University, Xi’an 710072, PR ChinaState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR ChinaState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR ChinaDepartment of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong Special Administrative RegionShaanxi Aerospace Flight Vehicle Design Key Laboratory, School of Astronautics, Nothwestern Polytechnical University, Xi’an 710072, PR ChinaShaanxi Aerospace Flight Vehicle Design Key Laboratory, School of Astronautics, Nothwestern Polytechnical University, Xi’an 710072, PR ChinaState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR ChinaState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Material Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR China; Corresponding author.Ca-Co-O ceramics is typically p-type thermoelectric materials and possesses positive Seebeck coefficient. In this work, n-type Ca-Co-O ceramics with negative Seebeck coefficients were fabricated by sintering and annealing in a reducing atmosphere. The microstructures and thermoelectric properties of the ceramics were investigated. The results show that the carrier concentration and the carrier mobility dramatically increase after the samples were annealed in the reducing atmosphere. The electrical resistivity increases from 0.0663 mΩ·cm to 0.2974 mΩ·cm, while the negative Seebeck coefficients varies from −24.9 μV/K to −56.3 μV/K as the temperature increases from 323 K to 823 K, and the maximum power factor (PF, 1.536 mW/m·K2) is obtained at 623 K. The samples have n-type thermoelectric properties with large PF values and ZT value (ZT = 0.39, 823 K). The unusual results will pave a new way for studying Ca-Co-O thermoelectric ceramics. Keywords: Thermoelectric ceramic, Negative Seebeck coefficient, Annealing, Reducing atmospherehttp://www.sciencedirect.com/science/article/pii/S2211379718305709
collection DOAJ
language English
format Article
sources DOAJ
author Chunlin Gong
Zongmo Shi
Yi Zhang
Yongsheng Chen
Jiaxin Hu
Jianjun Gou
Mengjie Qin
Feng Gao
spellingShingle Chunlin Gong
Zongmo Shi
Yi Zhang
Yongsheng Chen
Jiaxin Hu
Jianjun Gou
Mengjie Qin
Feng Gao
Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
Results in Physics
author_facet Chunlin Gong
Zongmo Shi
Yi Zhang
Yongsheng Chen
Jiaxin Hu
Jianjun Gou
Mengjie Qin
Feng Gao
author_sort Chunlin Gong
title Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
title_short Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
title_full Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
title_fullStr Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
title_full_unstemmed Fabrication and thermoelectric properties of Ca-Co-O ceramics with negative Seebeck coefficient
title_sort fabrication and thermoelectric properties of ca-co-o ceramics with negative seebeck coefficient
publisher Elsevier
series Results in Physics
issn 2211-3797
publishDate 2018-06-01
description Ca-Co-O ceramics is typically p-type thermoelectric materials and possesses positive Seebeck coefficient. In this work, n-type Ca-Co-O ceramics with negative Seebeck coefficients were fabricated by sintering and annealing in a reducing atmosphere. The microstructures and thermoelectric properties of the ceramics were investigated. The results show that the carrier concentration and the carrier mobility dramatically increase after the samples were annealed in the reducing atmosphere. The electrical resistivity increases from 0.0663 mΩ·cm to 0.2974 mΩ·cm, while the negative Seebeck coefficients varies from −24.9 μV/K to −56.3 μV/K as the temperature increases from 323 K to 823 K, and the maximum power factor (PF, 1.536 mW/m·K2) is obtained at 623 K. The samples have n-type thermoelectric properties with large PF values and ZT value (ZT = 0.39, 823 K). The unusual results will pave a new way for studying Ca-Co-O thermoelectric ceramics. Keywords: Thermoelectric ceramic, Negative Seebeck coefficient, Annealing, Reducing atmosphere
url http://www.sciencedirect.com/science/article/pii/S2211379718305709
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