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Journal of Inorganic Materials

Journal of Inorganic Materials >

2006 , Vol. 21 >Issue 4: 885 - 892

DOI: https://doi.org/10.3724/SP.J.1077.2006.00885

Research Paper

Phase Transition and Grain Growth Kinetics of V2O5 and B2O3 Doped Zinc Titanate Ceramics

  • LIU Xiang-Chun ,
  • ZHAO Li-Li ,
  • GAO Feng ,
  • YAN Xiao-Bin ,
  • TIAN Chang-Sheng
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  • School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Received date: 2005-07-06

  Revised date: 2005-09-06

  Online published: 2006-07-20

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Abstract

Zinc titanate ceramics were prepared by the conventional mixed-oxide method combined with a chemical processing. The effects of V2O5-B2O3 additives on the
low-temperature sintering behavior and phase structures of zinc titanate ceramics were investigated; and phase transition mechanism and grain growth kinetics were discussed. The results show that the densification temperature of zinc titanate ceramics can be reduced from 1100 to below 900℃ by V2O5-B2O3 addition. The temperature of complete phase transition from hexagonal ZnTiO3 phase to cubic Zn2TiO4 is lowered from 945 to 930℃ for V2O5-B2O3 co-doped samples. Exaggerated grain growth found is in V-rich region in high-V content samples and disappeared with B2O3 content increasing, at the same time, the grains become uniform. V2O5-B2O3 additive increases the diffusion rate of structure unit and accelerates grains growth. The Tradition Phenomenological Rate Equation (TPRE) model is well fit for characterizing the grain growth kinetics of V2O5-B2O3 co-doped zinc titanate ceramics. According to TPRE, the grain growth activation energy calculated is 315.5kJ/mol, the grain growth expression is shown as G=K0[texp(-315.5×103/RT)]1/7. The Q value decreases for V0-doped zinc metatitanate-based ceramics in microwave region as compared to single-phase hexagonal ZnTiO3 ceramics. The value of dielectric constant depends on the amount of rutile phase from the decomposition of hexagonal ZnTiO3 phase and the bulk density of ceramics.

Key words： zinc titanate; low-temperature sintering; XRD; kinetics

Cite this article

LIU Xiang-Chun , ZHAO Li-Li , GAO Feng , YAN Xiao-Bin , TIAN Chang-Sheng . Phase Transition and Grain Growth Kinetics of V2O5 and B2O3 Doped Zinc Titanate Ceramics[J]. Journal of Inorganic Materials, 2006 , 21(4) : 885 -892 . DOI: 10.3724/SP.J.1077.2006.00885

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