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High-pressure Induced Structural Decomposition of RE-doped YAG Nanoceramics

Dariusz Hreniak 1,  Stanisław Gierlotka 2,  Witold Łojkowski 2,  Wiesław Stręk 1,  Piotr Mazur 1,  Robert Fedyk 2,  Robert Pazika ,  Robert Pązik ,  Agnieszka Opalińska 

1. Polish Academy of Sciences, Institute of Low Temperature and Structure Research (INTiBS), Okólna 2, Wrocław 50-422, Poland
2. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland

Abstract

Abstract. The preparation of transparent nanoceramics from nanocrystalline Y3Al5O12 (YAG) powders doped with rare-earth ions has been described and the results of investigation of the structure and morphology have been presented. Decomposition of YAG nanocrystals into YAlO3 (YAP) was observed. The temperature and pressure for the decomposition was much lower than that reported for larger crystals. The transformation was connected with grain coarsening. The influence of the method of preparation of the YAG nanopowders on the final transparency of the nanoceramic produced was determined. Preliminary results of the dependence of luminescence properties on the structural transformation of the nanograins are presented.

 

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Dariusz Hreniak
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-12 12:46
Revised:   2009-06-07 00:44