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Solid solubility of Mg and enhanced electrical conduction in the C-axis orientation of CuCr1-xMgxO2 polycrystals
Tang, YY; Qin, M; Hu, YD; Cui, K; Zeng, JH; Chen, LW; Yu, L
2020-04-02
Source PublicationJOURNAL OF ASIAN CERAMIC SOCIETIES
ISSN2187-0764
Issue2Pages:537
SubtypeArticle
AbstractThe c-axis orientation of CuCr1-xMgxO2 (0 <= x <= 0.08) ceramics was prepared through solid-state reactions. The effects of a Mg solid solution in CuCrO2 have been investigated in terms of electrical conductivity, thermopower, and microstructure. While x = 0-0.03, the polycrystalline grains in a single-phase delafossite grew along the ab-plane with increasing (00 l) Lotgering factors of up to 0.53. It exhibited semiconducting electrical transport. The room temperature conductivity increased by 3-4 orders of magnitude, even up to 12.03 S center dot cm(-1), because of a reduction in Arrhenius activation energy. The Seebeck coefficient decreased from 828 to 257.8 mu V center dot K-1 at 330 K. For the doped samples, due to the contribution of the phonon drag thermopower overmatching the variation of the carrier concentration to the thermopower, it increased with increasing temperature, which was the opposite to that observed in the undoped samples. While x = 0.04-0.08, the second-phase MgCr2O4 spinel appeared and the properties and microstructure hardly changed. The layered structure of the c-axis orientation led to dominant electrical transport along the ab-plane and reduced the grain boundary, leading to weakened defect scattering, which caused an enhancement in conductivity.
DOI10.1080/21870764.2020.1761083
WOS KeywordTHERMOELECTRIC PROPERTIES ; PHYSICAL-PROPERTIES ; GRAIN-GROWTH ; IMPACT ; OXIDE
Language英语
WOS Research AreaMaterials Science
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28076
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Tang, YY,Qin, M,Hu, YD,et al. Solid solubility of Mg and enhanced electrical conduction in the C-axis orientation of CuCr1-xMgxO2 polycrystals[J]. JOURNAL OF ASIAN CERAMIC SOCIETIES,2020(2):537.
APA Tang, YY.,Qin, M.,Hu, YD.,Cui, K.,Zeng, JH.,...&Yu, L.(2020).Solid solubility of Mg and enhanced electrical conduction in the C-axis orientation of CuCr1-xMgxO2 polycrystals.JOURNAL OF ASIAN CERAMIC SOCIETIES(2),537.
MLA Tang, YY,et al."Solid solubility of Mg and enhanced electrical conduction in the C-axis orientation of CuCr1-xMgxO2 polycrystals".JOURNAL OF ASIAN CERAMIC SOCIETIES .2(2020):537.
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