標題: Semiconducting BiOCuSe Thermoelectrics and Its Metallic Derivative Bi2YO4Cu2Se2
作者: Chou, Ta-Lei
Tewari, Girish C.
Chan, Ting-Shan
Hsu, Ying-Ya
Chen, Jin-Ming
Yamauchi, Hisao
Karppinen, Maarit
加速器光源科技與應用學位學程
Master and Ph.D. Program for Science and Technology of Accelrrator Light Source
關鍵字: Layered oxyselenides;X-ray absorption spectroscopy;Local structures;Thermoelectrics;Layered compounds;Semiconductors
公開日期: 1-May-2015
摘要: ZrCuSiAs-type mixed-anion oxychalcogenides and oxypnictides form a massive family of functional materials readily tailored to host diverse transport properties. Here we investigate semiconducting BiOCuSe, which has been considered as a promising candidate for intermediate-temperature thermoelectric applications, and its intergrowth derivative Bi2YO4Cu2Se2, by using X-ray absorption spectroscopy. Stronger anisotropy and bond covalency are revealed for the latter phase, and in contrast to the simple charge-balance scenario of [Bi3+O2-](+)[Cu+Se2-](-) in the former phase, mixed-valence Cu+/Cu2+ with a single coordination sphere is seen in the selenide block of Bi2YO4Cu2Se2, which gives rise to a metallic electrical conductivity.
URI: http://dx.doi.org/10.1002/ejic.201500159
http://hdl.handle.net/11536/124831
ISSN: 1434-1948
DOI: 10.1002/ejic.201500159
期刊: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Issue: 15
起始頁: 2574
結束頁: 2578
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