Abstract
The dielectric ceramics Ba4Pr2Fe2Ta8O30 and Ba4Eu2Fe2Ta8O30 with a tetragonal tungsten bronze structure were synthesized and characterized. Dielectric and ferroelectric behaviors indicated that the ceramics are paraelectric above room temperature. Dielectric measurement showed that the present ceramics have high-temperature stability, a comparatively low temperature coefficient of dielectric constant (τɛ) of −30 and −63 ppm/°C, with a high dielectric constant (ɛr) of 110 and 87.6 together with a low dielectric loss (tan δ) of 0.0010 and 0.0012 (at 1 MHz) for Ba4Pr2Fe2Ta8O30 and Ba4Eu2Fe2Ta8O30, respectively. These results indicated that the Ba4Ln2Fe2Ta8O30 (Ln=Pr, Eu) ceramics might be promising in temperature-stable multilayer ceramic capacitors.
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