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首页> 外文期刊>Physica, B. Condensed Matter >Effect of excess oxygen for CuFeO 2.06 delafossite on thermoelectric and optical properties
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Effect of excess oxygen for CuFeO 2.06 delafossite on thermoelectric and optical properties

机译：多余氧对Cufeo的影响 2.06 热电学和光学性能的Delafossite

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AbstractThis work presents the role of excess oxygen in CuFeO2.06compounds on thermoelectric and optical properties. The CuFeO2.06specimens were synthesized by solid state reaction method. X-ray diffraction technique has confirmed the CuFeO2structure for the specimens. In particularly, CuFeO2.06specimen revealed the structural extension of lattice parameter:aandc. Also, the specimen found increasing excess oxygen of approximately 3% as a resulted enhancement of mixed valence state of Cu+and Cu2+ions. XPS showed mixed valence state of the Cu+/Cu2+ions, and Fe3+and Fe2+ions was also found in the CuFeO2.06specimen. Mixed valence states contributed the co-existence of hole and electron carriers for conduction. Consequently, electrical conductivity of the CuFeO2.06specimen increased up to 23S/cm at 873K. Also, increasing Seebeck coefficient was shown to be approximately 302μV/K at 873K. The CuFeO2.06specimen was found power factor to be approximately 2.1 × 10?4W/m?K2at 873K. The indirect optical gap of CuFeO2.06(2.40 eV) was lower than that of the CuFeO2(2.60 eV). Thus, thermoelectric and optical properties were governed by an existence of excess oxygen.
机译：<！[cdata [ 抽象 这项工作提出了多余的氧气在Cufeo中的作用 2.06 热电化合物和光学性质。通过固态反应方法合成了Cufeo 2.06 样品。 X射线衍射技术已经证实了Cufeo 2 结构的标本。特别地，Cufeo 2.06 标本显示了莱迪思参数的结构延伸： a 和 c < / ce：斜体>。此外，样品发现，随着Cu的混合价态的增强，产生约3％的量度增加约3％的氧气 + 和cu 2 + 离子。 XPS显示CU的混合价状态 + / cu 2 + 离子和fe < CE：sup =“post”> 3 + 和fe 2 + 离子在cufeo 2.06 标本。混合价态有助于孔和电子载体的共存进行传导。因此，Cufeo 2.06 标本在873K时增加了23秒/厘米的电导率。而且，增加塞贝克系数在873K时显示约为302μV/ k。 cufeo 2.06 标本被发现功率因数约为2.1×10 ？4 w / m？k 2 在873k。 Cufeo 2.06 （2.40ev）的间接光学间隙低于Cufeo 2 （2.60ev）。因此，热电和光学性质通过过量氧的存在来控制。

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