Influence of Copper(II) Oxide Additions to Zinc Niobate Microwave Ceramics on Sintering Temperature and Dielectric Properties

Dong Wan Kim, Kyung Hyun Ko, Kug Sun Hong

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The effect of CuO additions on the firing temperature of ZnNb2O6 ceramics was investigated using dilatometry, transmission electron microscopy, and X-ray diffractometry. A 5 wt% CuO addition to ZnNb2O6 ceramics significantly lowered the firing temperature from 1150° to ∼900°C. The presence of a CuO-rich intergranular phase in the specimen was observed and was evidence of the formation of a liquid phase during sintering. The composition of the liquid phase was (ZnCu2)Nb2O8. In particular, the low-fired ZnNb2O6 ceramics had good microwave dielectric characteristics - Q × f = 59 500, εr = 22.1, τr = -66 ppm/°C. These properties were correlated with the formation of a second phase, (ZnCu2)Nb2O8.

Original languageEnglish
Pages (from-to)1286-1290
Number of pages5
JournalJournal of the American Ceramic Society
Issue number6
Publication statusPublished - 2001 Jun 1
Externally publishedYes


ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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