Low-temperature sintering and microwave dielectric properties of Ba5Nb4O15-BaNb2O6 mixtures for LTCC applications

Dong Wan Kim, Kug Sun Hong, Chong S. Yoon, Chang Kyung Kim

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Abstract

The addition of B2O3 to Ba5Nb4O15-BaNb2O6 significantly lowered the sintering temperature to ∼900 °C in comparison to ∼1250 °C for samples without B2O3. The presence of a B2O3-rich intergranular phase in the sample was observed, which was attributed to the presence of a liquid phase during sintering. The barium metaniobate, BaNb2O6 has two polymorphs, with orthorhombic and hexagonal forms. A major contributor to microwave dielectric properties of low-fired samples is the low temperature phase, hexagonal BaNb2O6. The small amount of hexagonal BaNb2O6 could tune τf of Ba5Nb4O15. Therefore, Ba5Nb4O15-BaNb2O6 with B2O3 can be a suitable for low-temperature cofired ceramic (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: Q×f = 28 000 GHz, εr and τf are 42 and 0 ppm/°C, respectively. The chemical compatibility of silver electrodes and low-fired samples has also been investigated.

Original languageEnglish
Pages (from-to)2597-2601
Number of pages5
JournalJournal of the European Ceramic Society
Volume23
Issue number14
DOIs
Publication statusPublished - 2003 Jan 1

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Keywords

  • BaNbO
  • Capacitors
  • Dielectric properties
  • Electron microscopy
  • Niobates
  • Sintering

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