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Temperature‐Stable Relative Permittivity from −70°C to 500°C in ( Ba 0.8 Ca 0.2 ) TiO 3 – Bi ( Mg 0.5 Ti 0.5 ) O 3 – NaNbO 3 Ceramics
Author(s) -
Zeb Aurang,
Bai Yang,
Button Tim,
Milne Steven J.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12949
Subject(s) - relative permittivity , analytical chemistry (journal) , permittivity , atmospheric temperature range , electrical resistivity and conductivity , materials science , dissipation factor , ceramic , dielectric , temperature coefficient , chemical composition , mineralogy , chemistry , thermodynamics , chromatography , composite material , physics , optoelectronics , organic chemistry , quantum mechanics
Temperature‐stable relaxor dielectrics have been developed in the solid solution system: 0.45 Ba 0.8 Ca 0.2 TiO 3 –(0.55 − x ) Bi ( Mg 0.5 Ti 0.5 ) O 3 – x NaNbO 3 . Ceramics of composition x = 0 have a relative permittivity ɛ r = 950 ± 15% over a wide temperature range from +70°C to 600°C. Modification with NaNbO 3 at x = 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 x = 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 10 10 Ω m at 250°C and 10 7 Ω m at 400°C.