90. Influence of the Synthesis Temperature on the Crystallization Path and Kinetics of YAG Powder

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Paola Palmero1,
  2. Laura Montanaro1,
  3. Claude Esnouf2 and
  4. Gilbert Fantozzi2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch90

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Palmero, P., Montanaro, L., Esnouf, C. and Fantozzi, G. (2004) Influence of the Synthesis Temperature on the Crystallization Path and Kinetics of YAG Powder, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch90

Author Information

  1. 1

    Dept. Materials Science and Chem. Eng. Politecnico, Corso Duca degli Abruzzi, 24 10129 Torino, Italy

  2. 2

    GEMPPM INSA de Lyon, 20, Av. A. Einstein 69621 Villeurbann, France

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • screen printing;
  • ceramic powder;
  • mesoporous silica particles;
  • ethylene glycol;
  • terpineol - ethyl cellulose

Summary

Yttrium aluminium garnet (YAG) powders were synthesized by using a reverse-strike precipitation at three different temperatures, precisely at 5°, 25° and 60°C, to investigate the influence of the co-precipitation temperature on the precursor product and on its crystallization path. The synthesis temperature resulted to strongly affect the crystallization temperature, the phases appearance, their thermal evolution and the homogeneity of the final product. In the case of the powder synthesized at 25°C, the kinetic of the crystallization process was investigated by using an isothermal method. Amorphous powders were instantaneous heated at various temperatures (in the range between 855° and 955°C) for different times (from 0.1 up to 70 hours). By plotting all the experimental data, they resulted not to be well fitted by a single Avrami linear plot but initial and final regions can be distinguished. The initial data are affected by the crystallization of the non-equilibrium h-YAIO3 phase near to the YAG one, and therefore they can be considered with precaution; on the contrary for longer time data, kinetic parameters were obtained and an activation Energy for the crystallization process of 155 kJ/mol was determined.