Effect of organic additives on crystallization of boehmite gels

Monolithic planar boehmite gels of thickness of about 0.15 mm unseeded, seeded by Fe(NO3)3 and doped (3 wt%) with organics (polyvinyl alcohol, polyethylene glycol, and ethylene glycol) were examined by photoluminescence spectroscopy, in-situ optical transmittance and SEM. Polymeric organic additives...

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Bibliographic Details
Published in:Ceramics (Praha) 2003-01, Vol.47 (4), p.149-154
Main Authors: HOLKOVA, Zuzana, PACH, Ladislav, MAJLING, Jan, KAKOS, Jozef, KADLECIKOVA, Magdalena
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from solutions
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:Monolithic planar boehmite gels of thickness of about 0.15 mm unseeded, seeded by Fe(NO3)3 and doped (3 wt%) with organics (polyvinyl alcohol, polyethylene glycol, and ethylene glycol) were examined by photoluminescence spectroscopy, in-situ optical transmittance and SEM. Polymeric organic additives, although burned up at low temperatures (550 C), leave microstructure traces, having significant effect on high temperature processes, crystallisation and sintering. Polymeric additives cancel a profound positive high effect of Fe(NO3)3 to alpha-Al2O3 nucleation. 24 refs.
ISSN:0862-5468