Phase transformation, reaction kinetics and microwave characteristics of Bi 2O 3-ZnO-Nb 2O 5 ceramics

San-Yuan Chen*, Shinn Yih Lee, Yih Jaw Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Oxide powders of Bi 2O 3, ZnO and Nb 2O 5 were used to investigate the phase transformation, reaction kinetics and microwave properties of both Bi 2O 3-ZnO-Nb 2O 5 system. Kinetic studies indicate that the formation mechanism of Bi 2(Zn 1/3Nb2/3)2O7 phase belongs to diffusion controlled reaction with a zero nucleation rate. In contrast, (Bi 1.5Zn 0.5)(Zn 0.5Nb 1.5)O 7 phase was interpreted as diffusion controlled reaction with a constant nucleation rate with either Bi 5Nb 3O 15 or BiNbO 4 phases as the nuclei. Furthermore, a lower activation energy and formation temperature were observed in the (Bi 1.5Zn 0.5)(Zn 0.5Nb 1.5)O 7 than Bi 2(Zn 1/3Nb 2/3) 2O 7 phase. Additionally, the (Bi 1.5Zn 0.5)(Zn 0.5Nb 1.5)O 7 phase exhibits a higher dielectric constant but a lower Q value as compared with Bi 2(Zn 1/3Nb 2/3) 2O 7 phase.

Original languageEnglish
Pages (from-to)873-881
Number of pages9
JournalJournal of the European Ceramic Society
Volume23
Issue number6
DOIs
StatePublished - 1 May 2003

Keywords

  • Bi O -ZnO-Nb O
  • Microwave characteristics
  • Phase transformation
  • Reaction kinetics

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