Low-temperature sintering of V2O5-added and -substituted ZnNb2O6 microwave ceramics

Sung Hun Wee, Dong-Wan Kim, Sang Im Yoo, Kug Sun Hong

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Abstract

The sintering behaviors and microwave dielectric properties of V 2O5-added and -substituted ZnNb2O6, ceramics with columbite structure (abbreviated as ZNV and ZVN, respectively) have been investigated. It was found that the addition or substitution of V 2O5 to ZnNb2O6 ceramics lowers the sintering temperature from 1150°C to ∼900°C, but the sintering mechanisms are different. The formation of a ternary liquid phase is attributed to enhanced sintering in ZNV samples. Interaction between ZnNb2O 6 and V2O5 also led to the formation of a second phase, V3Nb17O50. In contrast, it has been observed that with up to 8 mol% substitution of V2O5 in ZnNb2O6, a complete solid solution is formed. The sintering temperature for the ZVN sample becomes lower due to the decreased temperature of liquidus according to the substitution of V for Nb ions. The microwave dielectric properties of ZNV samples are seriously degraded due to the presence of a V3Nb17O50 second phase. This was confirmed by measuring the dielectric properties of V3Nb 17O50 second phase. However, V-substituted Zn(Nb 0.94V0.06)2O6 samples sintered at 875°C for 2 h exhibit excellent microwave dielectric properties: Q × f of 65,000 GHz, εr of 24, and τf of -72 ppm/°C.

Original languageEnglish
Pages (from-to)3511-3515
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number6 A
Publication statusPublished - 2004 Jun 1
Externally publishedYes

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Keywords

  • Columbite ZnNbO
  • Dielectric properties
  • Low-temperature sintering
  • Microwave
  • VO

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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