ISSN:
1873-3956
Content:
Solid solutions of the (1-x)(0.94Bi0.5Na0.5TiO3-0.06BaTiO3)-xCaZrO3 system are regarded as promising dielectrics for high-temperature capacitors as they exhibit a remarkable flat trend of the permittivity over a large temperature range coupled with comparable low dielectric losses. In this work, the composition 0.8(0.94Bi0.5Na0.5TiO3-0.06BaTiO3)-0.2CaZrO3 was chosen in an attempt to optimize especially the high-temperature dielectric properties above 200 °C. In particular, the influence of excess bismuth to account for element losses caused by evaporation, and the effect of manganese as acceptor dopant are reported. Conventional solid-state reaction route was used to synthesize selected compositions. X-ray diffraction was used to confirm a pseudo-cubic perovskite main phase in all examined compositions, although small traces of a zirconia secondary phase were also detected. All samples exhibit an expected flat trend of the relative permittivity with a maximum deviation of the permittivity lower than 15% between -80 °C and 300 °C. The unmodified base composition shows small dielectric loss (〈2%) between -55 °C and 265 °C. By using small quantities of manganese doping, the small-loss temperature range was extended (-70 °C and 300 °C). Excess bismuth also affects the temperature-dependent dielectric losses, resulting in a narrowed temperature range, eventually limiting the application possibilities.
In:
Ceramics international, Amsterdam [u.a.] : Elsevier Science, 1981, 48(2022), 15, Seite 22228-22236, 1873-3956
In:
volume:48
In:
year:2022
In:
number:15
In:
pages:22228-22236
Language:
English
DOI:
10.1016/j.ceramint.2022.04.220
URL:
Volltext
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Author information:
Töpfer, Jörg 1962-
Author information:
Schaaf, Peter 1963-
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