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The dielectric loss of the CaCu3Ti4O12 ceramic is high, and the mechanism of the loss is not clear, which restricts its application. The CaCu3Ti4O12 ceramic samples are synthesised by solid state reaction method and coprecipitation method. The electronic relaxation of deep bulk traps at the depletion layer edge, carrier relaxation and the dielectric loss of CaCu3Ti4O12 ceramic are investigated. Both perfect double Schottky barrier and low impurity density can reduce the DC conductivity, thus reducing the low-frequency dielectric loss. High-frequency dielectric loss is controlled by deep bulk trap density, especially in the one whose activation energy is 0.12 eV. At room temperature, when the frequency is 1 kHz, the dielectric constant and loss of CaCu3Ti4O12 ceramic prepared by coprecipitation method are 1.4× 104 and 0.037, indicating a good improvement.
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Keywords:
- CaCu3Ti4O12 ceramics /
- dielectric loss /
- relaxation process /
- Schottky barrier
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[6] Choi S W, Hong S H, Kim Y M 2007 J. Am. Ceram. Soc. 90 4009
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[13] Adams T B, Sinclair D C, West A R 2006 Phys. Rev. B 73 094124
[14] Lin Y H, Cai J, Li M, Nan C W, He J 2006 Appl. Phys. Lett. 88 172902
[15] Chen K, Li G L, Gao F, Liu J, Liu J M, Zhu J S 2007 J. Appl. Phys. 101 074101
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[17] Li M, Feteira A, Sinclair D C, West A R 2006 Appl. Phys. Lett. 88 232903
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[19] Li J Y, Zhao X T, Li S T, Mohammad A 2010 J. Appl. Phys. 108 104104
[20] Chung S, Kim I, Kang S 2004 Nat. Mater. 3 774
[21] Kant C, Rudolf T, Mayr F, Krohns S, Lunkenheimer P, Ebbinghaus S G, Loidl A 2008 Phys. Rev. B 77 045131
[22] He L, Neaton J B, Cohen M H, Vanderbilt D, Homes C C 2002 Phys. Rev. B 65 214112
[23] He L, Neaton J B, Vanderbilt D, Cohen M H 2003 Phys. Rev. B 67 012103
[24] Chen L, Wang C L 2007 J. Magn. Magn. Mater. 31 266
[25] Jonscher A K 2008 Dielectric Relaxation in Solids (Xi'an:Xi'an Jiaotong University Press) p161 (in Chinese) [A. K. 琼克 2008固体中的介电弛豫(西安:西安交通大学出版社)第161页]
[26] Yang Y, Li S T 2009 Acta Phys. Sin. 58 6376 (in Chinese) [杨雁, 李盛涛 2009 58 6376]
[27] Jonscher A K 1975 Nature 256 566
[28] Marchin L, Guillemet F S, Durand B, Levchenko A, Navrotsky A, Lebey T 2008 J. Am. Ceram. Soc. 91 485
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[1] Subramanian M A, Li D, Duan N, Reisner B A, Sleight A W 2000 J. Solid State Chem. 151 323
[2] Home C C, Vogt T, Shapiro S M, Wakimoto S, Ramirez A P 2001 Science 293 673
[3] Sinclair D C, Adams T B, Morrison F D, West A R 2002 Appl. Phys. Lett. 80 2153
[4] Adams T B, Sinelair D C, West A R 2002 Adv. Mater. 14 1321
[5] Patterson E A, Kwon S, Huang C C, Cann D P 2005 Appl. Phys. Lett. 87 182911
[6] Choi S W, Hong S H, Kim Y M 2007 J. Am. Ceram. Soc. 90 4009
[7] Shao S F, Zhang J L, Zheng P, Wang C L, Li J C, Zhao M L 2007 Appl. Phys. Lett. 91 042905
[8] Mu CH, Liu P, He Y, Zhou J P, Zhang H W 2009 J. Alloys Compd. 471 137
[9] Guillemet F S, Lebey T, Boulos M, Durand B 2006 J. Eur. Ceram. Soc. 26 1245
[10] Marchin L, Guillemet F S, Durand B 2008 Prog. Solid State Chem. 36 151
[11] Cheng B, Lin Y H, Yuan J, Cai J, Nan C W, Xiao X, He J 2009 J. Appl. Phys. 106 034111
[12] Marco A L C, Flavio L S, Edson R L, Alexandre J C L 2008 Appl. Phys. Lett. 93 182912
[13] Adams T B, Sinclair D C, West A R 2006 Phys. Rev. B 73 094124
[14] Lin Y H, Cai J, Li M, Nan C W, He J 2006 Appl. Phys. Lett. 88 172902
[15] Chen K, Li G L, Gao F, Liu J, Liu J M, Zhu J S 2007 J. Appl. Phys. 101 074101
[16] Deng G, Yamada T, Muralt P 2007 Appl. Phys. Lett. 91 202903
[17] Li M, Feteira A, Sinclair D C, West A R 2006 Appl. Phys. Lett. 88 232903
[18] Yang Y, Li S T 2010 J. Inorg. Mater. 25 835 (in Chinese) [杨雁, 李盛涛 2010无机材料学报 25 835]
[19] Li J Y, Zhao X T, Li S T, Mohammad A 2010 J. Appl. Phys. 108 104104
[20] Chung S, Kim I, Kang S 2004 Nat. Mater. 3 774
[21] Kant C, Rudolf T, Mayr F, Krohns S, Lunkenheimer P, Ebbinghaus S G, Loidl A 2008 Phys. Rev. B 77 045131
[22] He L, Neaton J B, Cohen M H, Vanderbilt D, Homes C C 2002 Phys. Rev. B 65 214112
[23] He L, Neaton J B, Vanderbilt D, Cohen M H 2003 Phys. Rev. B 67 012103
[24] Chen L, Wang C L 2007 J. Magn. Magn. Mater. 31 266
[25] Jonscher A K 2008 Dielectric Relaxation in Solids (Xi'an:Xi'an Jiaotong University Press) p161 (in Chinese) [A. K. 琼克 2008固体中的介电弛豫(西安:西安交通大学出版社)第161页]
[26] Yang Y, Li S T 2009 Acta Phys. Sin. 58 6376 (in Chinese) [杨雁, 李盛涛 2009 58 6376]
[27] Jonscher A K 1975 Nature 256 566
[28] Marchin L, Guillemet F S, Durand B, Levchenko A, Navrotsky A, Lebey T 2008 J. Am. Ceram. Soc. 91 485
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