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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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A High-Temperature-Capacitor Dielectric Based on K0.5Na0.5NbO3-Modified Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3

Cited 19 times inthomson ciCited 14 times inthomson ci
Title
A High-Temperature-Capacitor Dielectric Based on K0.5Na0.5NbO3-Modified Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3
Author
Dittmer, RobertAnton, Eva-MariaJo, WookSimons, HughDaniels, John E.Hoffman, MarkPokorny, JanReaney, Ian M.Roedel, Juergen
Keywords
Dc conductivity; Different length scale; Ergodics; Field-dependent permittivity; High temperature; Morphotropic phase boundaries; Polar nanoregions; Relative permittivity; Relaxation mechanism; Relaxors; Structure data; Temperature dependent; TiO
Issue Date
2012-11
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.95, no.11, pp.3519 - 3524
Abstract
A high-temperature dielectric, (1x)(0.6Bi(1/2)Na(1/2)TiO(3)0.4Bi(1/2)K(1/2)TiO(3))xK(0.5)Na(0.5)NbO(3), off the morphotropic phase boundary of the parent matrix 0.8Bi(1/2)Na(1/2)TiO(3)0.2Bi(1/2)K(1/2)TiO(3), has been developed for application as a high-temperature capacitor. In addition to temperature-dependent permittivity and dielectric loss, DC conductivity and field-dependent permittivity are reported. These properties are correlated with temperature-dependent structure data measured at different length scales using Raman spectroscopy and neutron diffraction. It is suggested that all materials investigated are ergodic relaxors with two types of polar nanoregions providing different relaxation mechanisms. The most attractive properties for application as high-temperature dielectrics are obtained in a material with x,=,0.15 at less than 10% variation of relative permittivity of about 2100 between 54 degrees C and 400 degrees C.
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DOI
10.1111/j.1551-2916.2012.05321.x
ISSN
0002-7820
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MSE_Journal Papers
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