Influence of liquidphase sintering on microstructure and thermoelectric properties of Ca_(3)Co_(4)O_(9)based ceramics with Bi_(2)O_(3) additive
作者机构：State Key Laboratory of Solidification ProcessingMIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Material Science and EngineeringNorthwestern Polytechnical UniversityXi'an710072China State IJR Center of Aerospace Design and Additive ManufacturingMIIT Lab of Metal Additive Manufacturing and Innovative DesignNorthwestern Polytechnical UniversityXi'an710072China NPU-QMUL Joint Research Institute of Advanced Materials and StructureNorthwestern Polytechnical UniversityXi'an710072China
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2019年第5卷第4期
页 面：711-720页
核心收录：
学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China(No.51672219,5171101743,51702259) Excellent Youth Fund of the National Natural Science Foundation of China(No.11722219) Foundation of National High Technology Research and Development Program(No.2015AA0172) Fundamental Research Fund for the Central Universities(No.G2016KY0302) the“111”Project(No.B08040) the Research Foundation of the State Key Laboratory of Solidification Processing(NWPU),China(No.137-QP-2015).
主 题：Ca_(3)Co_(4)O_(9) Thermoelectric ceramics Thermal conductivity Phonon scattering
摘 要：Secondary phase Bi_(2)O_(3),which could promote the sintering densification of ceramics,was used to prepare(Ca_(0.85)Ag_(0.1)La_(0.05))_(3)Co_(4)O_(9) thermoelectric ceramics.The mechanism of liquidphase sintering process revealed that the diffusion rate of particles originated from the dissolvedeprecipitated processing for samples and suppressed the coarsening of grain growth.The effects of Bi_(2)O_(3) 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 liquidphase 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 mV/K to 190 mV/K with increasing Bi_(2)O_(3).Furthermore,the peak ZT value of 0.25 for 6 wt% Bi_(2)O_(3) sample at 1073 K was obtained,resulting from low thermal conductivity of 0.92 W/(m·K).It suggests that Bi_(2)O_(3) additive can dramatically improve the thermoelectric properties of Ca_(3)Co_(4)O_(9).
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