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Ba4Ln2Fe2Ta8O30 (Ln=Pr, Eu): Temperature-Stable Low Loss Dielectrics with a Tungsten Bronze Structure

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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 () of −30 and −63 ppm/°C, with a high dielectric constant (r) of 110 and 87.6 together with a low dielectric loss (tan ) 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.

Document Type: Research Article


Affiliations: 1: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2: Key laboratory of New Processing Technology for Nonferrous Metal and Materials, Guilin University of Technology, Guilin 541004, China

Publication date: 2010-04-01

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