Dielectric abnormities in BaTi{sub 0.9}(Ni{sub 1/2}W{sub 1/2}){sub 0.1}O{sub 3} giant dielectric constant ceramics

BaTi{sub 0.9}(Ni{sub 1/2}W{sub 1/2}){sub 0.1}O{sub 3} ceramics were fabricated and their dielectric properties were investigated. With the sintering temperature increasing from 1250 to 1280 deg. C, the grain size abruptly increases from 1-2 to 20-40 {mu}m, accompanying significant changes in dielect...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2007-07, Vol.91 (5)
Main Authors: Zhao Fei, Yue Zhenxing, Pei Jing, Yang Donghai, Gui Zhilun, Li Longtu
Format: Article
Language:English
Subjects:
ACTIVATION ENERGY
BARIUM COMPOUNDS
CERAMICS
DIELECTRIC MATERIALS
GRAIN SIZE
MATERIALS SCIENCE
NICKEL COMPOUNDS
PERMITTIVITY
RELAXATION
SINTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K
TITANIUM COMPOUNDS
TUNGSTEN COMPOUNDS
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:BaTi{sub 0.9}(Ni{sub 1/2}W{sub 1/2}){sub 0.1}O{sub 3} ceramics were fabricated and their dielectric properties were investigated. With the sintering temperature increasing from 1250 to 1280 deg. C, the grain size abruptly increases from 1-2 to 20-40 {mu}m, accompanying significant changes in dielectric response. The samples with larger grains exhibit giant dielectric constant characteristics, which are considered to be mainly attributed to the domain boundary effect. The activation energies of the dielectric relaxation E{sub relax}=0.325 eV reveal the existence of microdomains in larger grains. The ac conductivity results also give the evidence of the domain boundary effect in the present ceramics.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2767190