Lead-free high-temperature dielectrics with wide operational range
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- Lead-free high-temperature dielectrics with wide operational range
- Dittmer, Robert; Jo, Wook; Damjanovic, Dragan; Roedel, Juergen
- Capacitor materials; Dielectric anomaly; Dielectric permittivities; Electrical and structural properties; Electrical property; High temperature; High-temperature in situ; Lead-Free; Operational range; Optimal composition; Order of magnitude; Permittivity values; Pseudocubic; Small reduction; Space Groups; Structural change; Temperature dependent; Temperature-insensitive; Working temperatures
- Issue Date
- AMER INST PHYSICS
- JOURNAL OF APPLIED PHYSICS, v.109, no.3, pp. -
- The dielectric, electrical and structural properties of (1-x) (0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-xK(0.5)Na(0.5)NbO(3) (BNT-BT-xKNN) with x=0.09, 0.12, 0.15, and 0.18 were investigated as potential candidates for high-temperature capacitors with a working temperature far beyond 200 degrees C. Temperature dependent dielectric permittivity (epsilon) showed two local broad maxima that at the optimal composition of KNN (x=0.18) are combined to form a plateau. This then results in a highly temperature-insensitive permittivity up to similar to 300 degrees C at the expense of a small reduction in absolute permittivity values. High-temperature in situ x-ray diffraction study showed pseudocubic symmetry without obvious structural changes, which implies that the dielectric anomalies observed could only be a consequence of a slight change in space group. BNT-BT-0.18KNN showed a permittivity of similar to 2150 at the frequency of 1 kHz at 150 degrees C with a normalized permittivity epsilon/epsilon(150 degrees C) varying no more than +/- 10% from 43 to 319 degrees C. With very good electrical properties persisting up to 300 degrees C, i.e., a resistivity on the order of magnitude of 10(8) Omega m and the RC constant of about 1 s, the examined BNT-BT-xKNN compositions present a good starting point for the development of high-temperature capacitor materials.
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