CuAlO_2薄膜的Raman谱表征及介电行为研究
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摘要
本文研究了铜铁矿结构CuAlO2薄膜的变温Raman谱和介电行为。研究结果表明:体系存在电声子耦合,声子非谐衰减是峰频移动、峰宽展宽的主要原因。介电弛豫频率随温度的上升向高频方向移动,并且弛豫过程的激活能和电输运过程的激活能基本相当,说明两者间存在紧密的关联。该结果对进一步研究铜铁矿型材料的晶体结构和应用性能具有指导意义。
引文
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[2]Chen X B,Huso J,Morrison J L,Bergman L,Purdy A P.Temperature response and anharmonicity of the optical phonons inGaN nanowires,Journal of Applied Physics[J].2005,(98):026106.
[3]Deng Z H,Zhu X B,Tao R H,et al.Synthesis of CuAlO2 ceramics using sol-gel[J].Materials Letters,2007,(61):686-689.
[4]Park K,Ko K Y,Seo W S.Thermoelectric properties of CuAlO2[J].Journal of European Ceramic Society,2005,(25):2219-2222.
[5]Banerjee A N,Chattopadhyay K K.Size-dependent optical properties of sputter-deposited nanocrystalline p-type transpar-ent CuAlO2 thin films[J].Journal of Applied Physics,2005,(97):084308.
[6]Banerjee A N,Kundoo S,Chattopadhyay K K.Synthesis and Characterization of p-type transparent conducting CuAlO2 thinfilm by DC sputtering[J].Thin Solid Film,2003,(440):5-10.
[7]Ingram B J,Mason T O,Asahi R,et al.Electronic structure and small polaron hole transport of copper aluminate[J].Physi-cal Review B,2001,(64):155114.
[8]Ishiguro T,Ishizawa N,Mizutani N,et al.High-temperature structural investigation of the delafossite type compoundCuAlO2[J].Journal of Solid State Chemistry,1982,(41):132-137.
[9]Pellicer-Porres J,Garcia D M,Segura A,et al.Pressure and temperature dependence of the lattice dynamics of CuAlO2 in-vestigated by Raman scattering experiments and ab initio calculations[J],Physical Review B,2006,(74):184301.
[10]Pellicer-Porres J,Segura A,Martinez E,et al.Vibrational properties of delafossite CuGaO2 at ambient and high pressures[J].Physical Review B,2005,(72):064301.
[11]Singh M K,Dussan S,Sharma G L,et al.Raman scattering measurements of phonon anharmonicity in CuAlO2 thin films[J].Journal of Applied Physics,2008,(104):113503.
[12]Kawazoe H,Yasukawa M,Hyodo H,et al.P-type electrical conduction in transparent thin films of CuAlO2[J].Nature,1997,(389):939-942.
[13]Gao S M,Zhao Y,Gou P P,et al.Preparation of CuAlO2 nanocrystalline transparent thin films with high conductivity[J].Nanotechnology,2003,(14):538-541.
[14]Zheng X G,Taniguchi K,Takahashi K,et al.Room temperature sensing of ozone by transparent p-type semiconductorCuAlO2[J].Applied Physics Letters,2004,(85):1728-1729.
[15]Koriche N,Bouguelia A,Aider A,et al.Photocatalytic hydrogen evolution over delafossite CuAlO2[J].International Journalof Hydrogen Energy,2005,(30):693-699.
[16]Prakash T,Prasad K P,Kavitha R,et al.Dielectric relaxation studies of nanocrystalline CuAlO2 using modulus formalism[J].Journal of Applied Physics,2007,(102):104104.
[17]Jiang H F,Lei H C,Zhu X B,et al.Effects of citric acid on properties of single phase CuAlO2 thin films derived by chemi-cal solution deposition[J].Journal of Alloys and Compounds,2009,(487):404-408.
[18]Samanta K,Bhattacharya P,Katiyar R S,Temperature dependent E-2 Raman modes in the ZnCoO ternary alloy[J].Physi-cal Review B,2007,(75):035208.
[19]Ramkumar C,Jain K P,Abbi S C.Raman-scattering probe of anharmonic effects due to temperature and compositionaldisorder in III-V binary and ternary alloy semiconductors[J].Physical Review B,1996,(53):13672-13681.
[20]Macdonald J R.Impedance Spectroscopy:Emphasizing Solid Materials and Systems[M].New York,1987.
[21]Macedo P B,Moynihan C T,Bosech R.Role of ionic diffusion in polarization in vitreous ionic conductors[J].Physics andChemistry of Glasses,1972,(13):171-179.
[22]Moynihan C T,Boesch L P,Laberge N L.Decay function for electric-field relaxation in vitreous ionic conductors[J].Physics and Chemistry of Glasses,1973,(14):122-125.
[23]Jiang H F,Zhu X B,Lei H C,et al.Effects of Mg substitution on the structural,optical,and electrical properties of CuAlO2thin films[J].Journal of alloys and compounds,2011,(509):1768-1773.