Low-temperature sintering and microwave dielectric properties of zinc metatitanate-rutile mixtures using boron

Hyo Tae Kim, Seong Ho Kim, Sahn Nahm, Jae Dong Byun, Yoonho Kim

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Abstract

Mixtures of zinc metatitanate and rutile (ZnTiO3+xTiO2, where x = 0-0.5) have been prepared via the conventional mixed-oxide method. Centrifugal planetary milling with zirconia beads 1 mm in diameter produced very fine powders (mean particle size of 0.2 μm), which allowed the synthesis of ZnTiO3 and sintering at temperatures <945 °C, which is the decomposition temperature of ZnTiO3. Sintering of the mixtures was enhanced further by the addition of B2O3. Densities of >94% of the theoretical density have been attained for the specimens that were sintered at 875 °C for 4 h with B2O3 additions of <1 wt%. Microwave dielectric properties of the aforementioned compositions were as follows: dielectric constant of 29-31, normalized quality factor of 56000-69000 GHz, and a temperature coefficient of resonance frequency between -10 and +10 ppm/°C. Sintering was enhanced by the formation of a ZnO-B2O3 liquid phase, which affected the microwave properties, because of variation in the phase composition.

Original languageEnglish
Pages (from-to)3043-3048
Number of pages6
JournalJournal of the American Ceramic Society
Volume82
Issue number11
Publication statusPublished - 1999 Nov 1

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ASJC Scopus subject areas

  • Ceramics and Composites

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