Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive

Secondary phase Bi2O3, which could promote the sintering densification of ceramics, was used to prepare (Ca0.85Ag0.1La0.05)3Co4O9 thermoelectric ceramics. The mechanism of liquid−phase sintering process revealed that the diffusion rate of particles originated from the dissolved–precipitated processi...

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Main Authors: Zongmo Shi, Feng Gao, Jihong Zhu, Jie Xu, Yi Zhang, Tong Gao, Mengjie Qin
Format: Article
Language:English
Published: Elsevier 2019-12-01
Series:Journal of Materiomics
Online Access:http://www.sciencedirect.com/science/article/pii/S2352847819300462
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spelling doaj-467b46e0f54746b78ae1abf5c752f8282020-11-25T01:00:58ZengElsevierJournal of Materiomics2352-84782019-12-0154711720Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additiveZongmo Shi0Feng Gao1Jihong Zhu2Jie Xu3Yi Zhang4Tong Gao5Mengjie Qin6State 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, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, 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, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, China; Corresponding author. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, China.State IJR Center of Aerospace Design and Additive Manufacturing, MIIT Lab of Metal Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an, 710072, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, 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, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, 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, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, ChinaState IJR Center of Aerospace Design and Additive Manufacturing, MIIT Lab of Metal Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an, 710072, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, 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, China; NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi'an, 710072, ChinaSecondary phase Bi2O3, which could promote the sintering densification of ceramics, was used to prepare (Ca0.85Ag0.1La0.05)3Co4O9 thermoelectric ceramics. The mechanism of liquid−phase sintering process revealed that the diffusion rate of particles originated from the dissolved–precipitated processing for samples and suppressed the coarsening of grain growth. The effects of Bi2O3 on the microstructure and thermoelectric properties were investigated. The results showed that the relative density of samples increased from 92.1% to 95.5% through the liquid−phase sintering mechanism. The band gaps were tuned and it had the profound impact on the transport of charge carriers. Electrical resistivity decreased while Seebeck coefficient increased from 110 μV/K to 190 μV/K with increasing Bi2O3. Furthermore, the peak ZT value of 0.25 for 6 wt% Bi2O3 sample at 1073 K was obtained, resulting from low thermal conductivity of 0.92 W/(m·K). It suggests that Bi2O3 additive can dramatically improve the thermoelectric properties of Ca3Co4O9. Keywords: Ca3Co4O9, Thermoelectric ceramics, Thermal conductivity, Phonon scatteringhttp://www.sciencedirect.com/science/article/pii/S2352847819300462
collection DOAJ
language English
format Article
sources DOAJ
author Zongmo Shi
Feng Gao
Jihong Zhu
Jie Xu
Yi Zhang
Tong Gao
Mengjie Qin
spellingShingle Zongmo Shi
Feng Gao
Jihong Zhu
Jie Xu
Yi Zhang
Tong Gao
Mengjie Qin
Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
Journal of Materiomics
author_facet Zongmo Shi
Feng Gao
Jihong Zhu
Jie Xu
Yi Zhang
Tong Gao
Mengjie Qin
author_sort Zongmo Shi
title Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
title_short Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
title_full Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
title_fullStr Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
title_full_unstemmed Influence of liquid−phase sintering on microstructure and thermoelectric properties of Ca3Co4O9−based ceramics with Bi2O3 additive
title_sort influence of liquid−phase sintering on microstructure and thermoelectric properties of ca3co4o9−based ceramics with bi2o3 additive
publisher Elsevier
series Journal of Materiomics
issn 2352-8478
publishDate 2019-12-01
description Secondary phase Bi2O3, which could promote the sintering densification of ceramics, was used to prepare (Ca0.85Ag0.1La0.05)3Co4O9 thermoelectric ceramics. The mechanism of liquid−phase sintering process revealed that the diffusion rate of particles originated from the dissolved–precipitated processing for samples and suppressed the coarsening of grain growth. The effects of Bi2O3 on the microstructure and thermoelectric properties were investigated. The results showed that the relative density of samples increased from 92.1% to 95.5% through the liquid−phase sintering mechanism. The band gaps were tuned and it had the profound impact on the transport of charge carriers. Electrical resistivity decreased while Seebeck coefficient increased from 110 μV/K to 190 μV/K with increasing Bi2O3. Furthermore, the peak ZT value of 0.25 for 6 wt% Bi2O3 sample at 1073 K was obtained, resulting from low thermal conductivity of 0.92 W/(m·K). It suggests that Bi2O3 additive can dramatically improve the thermoelectric properties of Ca3Co4O9. Keywords: Ca3Co4O9, Thermoelectric ceramics, Thermal conductivity, Phonon scattering
url http://www.sciencedirect.com/science/article/pii/S2352847819300462
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