A High-Temperature-Capacitor Dielectric Based on K0.5Na0.5NbO3-Modified Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3
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- A High-Temperature-Capacitor Dielectric Based on K0.5Na0.5NbO3-Modified Bi1/2Na1/2TiO3-Bi1/2K1/2TiO3
- Dittmer, Robert; Anton, Eva-Maria; Jo, Wook; Simons, Hugh; Daniels, John E.; Hoffman, Mark; Pokorny, Jan; Reaney, Ian M.; Roedel, Juergen
- 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
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.95, no.11, pp.3519 - 3524
- 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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