利用传统的固相反应工艺制备了NaCu3Ti3NbO12和NaCu3Ti3SbO12陶瓷,对它们的介电性质和晶格结构进行了研究.结果显示,两种陶瓷都存在低频介电常数高于7×103的巨介电行为;在室温或者更低温度下,两种陶瓷的介电频谱(40 Hz～110 MHz)的实部只出现一个介电弛豫,而更高温度下的介电频谱的实部则会有两个介电弛豫;XRD结果显示两种陶瓷中都含有少量的CuO第二相.这些实验结果能用CCTO陶瓷中的内阻挡层电容效应解释.NaCu3Ti3SbO12陶瓷的室温介电损耗在40 Hz到7 kHz的宽频率范围内低于0.05,并且其1 kHz的介电损耗在-50～80℃的宽温度范围内低于0.05,这对于实际应用有重要意义.
参考文献
| [1] | Subramanian M A,Li D,Duan N,et al.High dielectric constant in ACu3Ti4O12 and ACu3Ti3FeO12 phases.J.Solid State Chem.,2000,151(2):323-325. |
| [2] | Ramirez A P,Subramanian M,Gardel M,et al.Giant dielectric constant response in a copper-titanate.Solid State Comm.,2000,115(5):217-220. |
| [3] | Homes C C,Vogt T,Shapiro S M,et al.Optical response of high-dielectric-constant perovskite-related oxide.Science,2001,293(5530):673-676. |
| [4] | Sinclair D C,Adams T B,Morrison F D.CaCu3Ti4O12:one-step internal barrier layer capacitor.Appl.Phys.Lett.,2002,80(12):2153-2155. |
| [5] | Zhou Xiao-Li,Du Pei-Yi.Effects of preparation on giant dielectric constant of CaCu3Ti4O12 ceramics.J.Inorg.Mater,2005,20(2):484-488. |
| [6] | Yang Yan,Li Sheng-Tao.CaCu3Ti4O12 ceramics prepared by coprecipitation method.J.Inorg.Mater,2010,25(8):835-839. |
| [7] | Adams T B,Sinclair D C,West A R.Giant barrier layer capacitance effects in caCu3Ti4O12 ceramics.Adv Mater.,2002,14(18):1321-1323. |
| [8] | Cohen M H,Neaton J B,He L,et al.Extrinsic models for the dielectric response of CaCu3Ti4O12.J.Appl.Phys.,2003,94(5):3299-3306. |
| [9] | Lunkenheimer P,Fichtl R,Ebbinghaus S G,et al.Nonintrinsic origin of the colossal dielectric constants in CCTO.Phys.Rev.B,2004,70(17):172102. |
| [10] | Fang T T,Shiau H K.Mechanism for developing the boundary barrier layer of CaCu3Ti4Ot2.J Am.Ceram.Soc.,2004,87(11):2072-2099. |
| [11] | Bender B A,Pan M J.The effect of processing on the giant dielectric properties of CaCu3Ti4O12.Mater Sci.Eng.B,2005,117(3):339-347. |
| [12] | Ni L,Chen X M,Liu X Q,et al.Microstructure-dependent giant dielectric response in CaCu3Ti4O12 ceramics.Solid State Commun.,2006,139:45-50. |
| [13] | Capsoni D,Bini M,Massarotti V,et al.Role of doping and CuO segregation in improving the giant permittivity of CaCu3Ti4O12.J.Solid State Chem.,2004,177(12):4494-4500. |
| [14] | Li J,Subramanian M A,Rosenfeld H D,et al.Clues to the giant dielectric constant of CaCu3Ti4O12 in the defect structure of SrCu3Ti4O12.Chem.Mater.,2004,16(25):5223-5225. |
| [15] | Fang T T,Mei L T,Ho H F.Effects ofCu stoichiometry on the microstructure,barrier-layer structures,electrical conduction,dielectrie responses,and stability of CaCu3Ti4O12.Acta Mater,2006,54(10):2867-2875. |
| [16] | Fang T T,Mei L T.Evidence of Cu deficiency:a key point for the understanding of the mystery of the giant dielectric constant in CaCu3Ti4O12.J.Am.Ceram.Soc.,2007,90(2):638-640. |
| [17] | Li M,Feteira A,Sinclair D C,et al.Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics.Appl.Phys.Lett.,2006,88:232903. |
| [18] | Romero J J,Leret P,Rubio-Marcos F,et al.Evolution of the intergranular phase during sintering of CaCu3Ti4O12 ceramics.J.Eur Ceram.Soc.,2010,30:737-742. |
| [19] | Ferrarelli M C,Adams T B,Feterira A,et al.High intrinsic permittivity in Na1/2Bi1/2Cu3Ti4O12.AppL.Phys.Lett.,2006,89:212904. |
| [20] | Zuo R Q,Feng L X,Yah Y Y,et al.Observation of giant dielectric constant in CdCu3Ti4O12 ceramics.Solid State Commun.,2007,138:91-96. |
| [21] | Szwagierczak D.Dielectric behavior of Bi2/3Cu3Ti4O12 ceramic and thick films.J.Electroceram.,2009,23:56-61. |
| [22] | Hao W T,Zhang J L,Tan Y Q,et al.Giant dielectric-permittivity phenomena of compositionally and structurally CaCu3Ti4O12-like oxide ceramics.J.Am.Ceram.Soc.,2009,92:2937-2943. |
| [23] | Bochu B,Deschizeaux M N,Joubert J C,et al.Synthèse et caractérisation d'une série de titanates pérowskites isotypes de[CaCu3](Mn4)O12.J.SolidState Chem.,1979,29:291-298. |
| [24] | Subramanian M A,Sleight A W.ACu3Ti4O12 and ACu3Ru4O12 perovskites:high dielectric constants and valence degeneracy.SolidState Sci.,2002,4:347-351. |
| [25] | Zhang J L,Zheng P,Wang C L,et al.Dielectric dispersion of CaCu3Ti4O12 ceramics at high temperatures.Appl.Phys.Lett.,2005,87(14):142901. |
| [26] | Feng L X,Tang X M,Yan Y Y,et al.Decrease of dielectric lossin CaCu3Ti4O12 ceramics by La doping.Phys.Stat.Sol.(a),2006,203(4):R22-R24. |
| [27] | Shao S F,Zhang J L,Zheng P,et al.Microstructure and electrical properties of CaCu3Ti4O12 ceramics.J.Appl.Phys.,2006,99(8):084106. |
| [28] | Zhang L,Tang Z J.Polaron relaxation and variable-range-hopping conductivity in the giant-dielectric-constant material CaCu3Ti4O12.Phys.Rev.B,2004 70:174306. |
| [29] | Wang C,Zhang H J,He P M,et al.Ti-rich and Cu-poograin-boundary layers of CaCu3Ti4O12 detected by X-ray photoelectron spectroscopy.Appl.Phys.Lett.,2007,91:052910. |
| [30] | Ni L,Chen X M.Dielectric relaxations and formation mechanism of giant dielectric constant step in CaCu3Ti4O12 ceramics.Appl.Phys.Lett.,2007,91:122905. |
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