Temperature‐Stable Relative Permittivity from −70°C to 500°C in (Ba0.8Ca0.2)TiO3–Bi(Mg0.5Ti0.5)O3–NaNbO3 Ceramics. Issue 8 (12th May 2014)

• Record Type: Journal Article
• Authors: Zeb, Aurang; Bai, Yang; Button, Tim; Milne, Steven J.; Jo, W.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 8(2014)
• Page Start: 2479
• Page End: 2483
• Publication Date: 2014-05-12
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12949
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12949-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Temperature‐stable relaxor dielectrics have been developed in the solid solution system: 0.45Ba_0.8Ca_0.2TiO₃–(0.55 − <italic>x</italic>)Bi(Mg_0.5Ti_0.5)O₃–<italic>x</italic>NaNbO₃. Ceramics of composition <italic>x</italic> = 0 have a relative permittivity ɛ_r = 950 ± 15% over a wide temperature range from +70°C to 600°C. Modification with NaNbO₃ at <italic>x</italic> = 0.2 decreases the lower limiting temperature to −70°C, but also decreases relative permittivity such that ɛ_r ~ 600 ± 15% over the temperature range −70°C to 500°C. For composition <italic>x</italic> = 0.3, the low‐temperature dispersion in loss tangent, tan δ, (at 1 kHz) shifts to lower temperature, giving tan δ values ≤0.02 across the temperature range −60°C to 300°C in combination with ɛ_r ~ 550 ± 15%. Values of dc resistivity for all samples are of the order of 10¹⁰ Ω m at 250°C and 10⁷ Ω m at 400°C.</p> </abstract>