Investigation on the dielectric properties of CaCu3Ti4+xO12+2x

Author

Xu, T.W. ; Li, J.Y. ; Li, S.T.

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an

fYear

2008

fDate

7-11 Sept. 2008

Firstpage

211

Lastpage

214

Abstract

Investigation on the dielectric properties of CaCu₃Ti_4+xO_12+2x was carried out when x was altered in the range from -0.5 to 0.5. For x= -0.5, it was found through XRD that besides primary CCTO phase, there are also CuO and CaTiO₃ phases. For x= 0.5, additional TiO₂ was found besides dominating CCTO phase. When x increases from -0.5 to 0.5, it was found that dielectric constant decreases, varistor voltage and non-linear coefficient increase while the dielelctric loss decreases. According to IBLC theory, it is suggested that the change of the grain boundary structure results in different barrier height and surface state when x changes.

Keywords

X-ray diffraction; calcium compounds; copper compounds; dielectric losses; grain boundaries; permittivity; CaCu₃Ti_4+xO_12+2x; XRD; dielectric constant; dielectric properties; dielelctric loss; grain boundary structure; Copper; Dielectric constant; Dielectrics and electrical insulation; Frequency; Grain boundaries; Powders; Temperature; Varistors; Voltage; X-ray scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials, 2008. (ISEIM 2008). International Symposium on

Conference_Location

Mie

Print_ISBN

978-4-88686-005-7

Electronic_ISBN

978-4-88686-006-4

Type

conf

DOI

10.1109/ISEIM.2008.4664570

Filename

4664570