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Journal of Materials Science

, Volume 31, Issue 10, pp 2631–2639 | Cite as

Effects of Y2O3 and La2O3 addition on the crystallization of Li2O·Al2O3·4SiO2 glass-ceramic

  • Jiin-Jyh Shyu
  • Chi-Sheng Hwang
Papers

Abstract

Effects of adding Y2O3 and La2O3 on the crystallization of β-quartz solid solution (ss) and the subsequent β-quartz ss to β-spodumene transformation of Li2O·Al2O3·4SiO2 glass-ceramic were investigated. Adding ≥ 4 mol% YO3/2 or 8 mol % LaO3/2 effectively improved the control of the crystallization process of the glass. Y2O3 did not effectively induce bulk crystallization of β-quartz ss, but can reduce the rate of surface crystallization. La2O3 completely suppressed the surface crystallization and promoted a uniform, bulk crystallization of β-quartz ss. For both the Y2O3- and La2O3-doped glasses, the kinetics for glass crystallization to β-quartz ss was delayed as the doping level increased. Except for the 8 mol % LaO3/2-doped glass in which no β-spodumene was formed, the kinetics for the β-quartz ss to β-spodumene transformation for the doped glasses was enhanced compared with that for the undoped glass. For the 4 and 8 mol % YO3/2-doped compositions, the relative amount of β-spodumene to β-quartz revealed an anomalous decrease trend with heating temperature in a particular temperature range. This can be explained by the surface crystallization characteristic, which induced an overlap of crystallization and β-quartz ss to β-spodumene transformation. Glass doped with 8 mol % LaO3/2 exhibited an Avrami exponent of about 2.4 and an activation energy for crystal growth of β-quartz ss of about 418 kJ mol−1.

Keywords

Crystallization Activation Energy Al2O3 Y2O3 Crystallization Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • Jiin-Jyh Shyu
    • 1
  • Chi-Sheng Hwang
    • 1
  1. 1.Department of Materials EngineeringTatung Institute of TechnologyTaipeiTaiwan

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