|
|||||
|
|
BaTiO3–Bi(Mg2/3Nb1/3)O3 Ceramics for High‐Temperature Capacitor Applications |
|
| Authors: | Raz Muhammad Yaseen Iqbal Ian M Reaney |
| Affiliation: | 1. Department of Physics, Islamia College University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK;3. Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan |
| Abstract: | Solid solutions of (1?x)BaTiO3–xBi(Mg2/3Nb1/3)O3 (0 ≤ x ≤ 0.6) were prepared via a standard mixed‐oxide solid‐state sintering route and investigated for potential use in high‐temperature capacitor applications. Samples with 0.4 ≤ x ≤ 0.6 showed a temperature independent plateau in permittivity (εr). Optimum properties were obtained for x = 0.5 which exhibited a broad and stable relative εr ~940 ± 15% from ~25°C to 550°C with a loss tangent <0.025 from 74°C to 455°C. The resistivity of samples increased with increasing Bi(Mg2/3Nb1/3)O3 concentration. The activation energies of the bulk were observed to increase from 1.18 to 2.25 eV with an increase in x from 0 to 0.6. These ceramics exhibited excellent temperature stable dielectric properties and are promising candidates for high‐temperature multilayer ceramic capacitors for automotive applications. |
| Keywords: | dielectric materials/properties electroceramics lead‐free ceramics impedance spectroscopy |