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Spark Plasma Sintering of Barium Zirconate Titanate/Carbon Nanotube Composites with Colossal Dielectric Constant and Low Dielectric Loss
Author(s) -
Wu Yong Jun,
Su Shao Hua,
Cheng Ji Peng,
Chen Xiang Ming
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04361.x
Subject(s) - materials science , dielectric , spark plasma sintering , composite material , high κ dielectric , dielectric loss , carbon nanotube , barium titanate , microstructure , composite number , lead zirconate titanate , nanotube , sintering , ceramic , ferroelectricity , optoelectronics
Ba(Zr 0.2 Ti 0.8 )O 3 /carbon nanotube composites were prepared by spark plasma sintering and characterized by SEM and dielectric spectrometer. The composites exhibit colossal dielectric constant up to several 10 5 with relatively low dielectric loss over a wide temperature range from 250 to 400 K. For composite with 0.025 wt% CNTs, the dielectric constant and dielectric loss at 50°C and 1 kHz were 6.1 × 10 5 and 0.074, respectively. The high dielectric constant can be explained by the Maxwell–Wagner polarization originating from the CNTs and Ba(Zr 0.2 Ti 0.8 )O 3 interfaces and microcapacitance microstructure.