Transport and Defect Mechanisms in Cuprous Delafossites. 1. Comparison of Hydrothermal and Standard Solid-State Synthesis in CuAlO2
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- 作者：Brian J. Ingram ; Gabriela B. Gonzá ; lez ; Thomas O. Mason ; Dean Y. Shahriari ; Antoine Barnabè ; Donggeun Ko ; and Kenneth R. Poeppelmeier
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：December 28, 2004
- 年：2004
- 卷：16
- 期：26
- 页码：5616 - 5622
- 全文大小：192K
- 年卷期：v.16,no.26(December 28, 2004)
- ISSN：1520-5002
文摘
CuAlO2 exhibits a unique defect structure that is dependent on the synthesis route. High-temperature solid-state and low-temperature hydrothermal techniques are compared toillustrate how cation off-stoichiometry affects the electrical properties of CuAlO2. A defectcomplex of Al on a Cu-site stabilized by two bound oxygen interstitials (AlCu
2Oi' ')' ' is proposedwhich serves as an acceptor dopant to set the hole concentration. Trapping of holes (smallpolarons) by such complexes with decreasing temperature is proposed to account for thedecreasing carrier content with temperature. Hydrothermal samples exhibit approximatelyan order of magnitude increase in hole concentration relative to the solid-state synthesizedsamples; this is reflected in the electrical conductivity and may explain the variations inelectrical properties reported for CuAlO2.
2Oi' ')' ' is proposedwhich serves as an acceptor dopant to set the hole concentration. Trapping of holes (smallpolarons) by such complexes with decreasing temperature is proposed to account for thedecreasing carrier content with temperature. Hydrothermal samples exhibit approximatelyan order of magnitude increase in hole concentration relative to the solid-state synthesizedsamples; this is reflected in the electrical conductivity and may explain the variations inelectrical properties reported for CuAlO2.