Effect of sol-gel modifications on formation and morphology of nanocrystalline lanthanum aluminate


Koc S. N. , Oksuzomer F. , Yasar E., Akturk S., Gurkaynak M. A.

MATERIALS RESEARCH BULLETIN, cilt.41, sa.12, ss.2291-2297, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 41 Konu: 12
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.materresbull.2006.04.025
  • Dergi Adı: MATERIALS RESEARCH BULLETIN
  • Sayfa Sayıları: ss.2291-2297

Özet

LaAlO3 powders are prepared by sol-gel method. The effect of preparation conditions on morphological properties and crystal formations are investigated. iso-Propanol/tert-butanol and ethyl acetoacetate/ethylene glycol monomethylether are used solvents and complexing agents, respectively. Samples are dried with conventional and freeze-drying methods and calcined between 600 and 1000 degrees C. TGA, DTA, XRD, SEM and TEM methods are used for characterization. It is observed that freeze-dried sample prepared with tert-butanol has the lowest LaAlO3 formation temperature and uniform rhombohedral crystals. But conventionally dried sample, prepared with iso-propanol has smallest agglomerates at 1000 degrees C and does not show clear crystallization temperature in DTA analysis. The XRD peaks of LaAlO3 crystal are observed at 600 degrees C for all samples prepared by various sol-gel conditions. (C) 2006 Elsevier Ltd. All rights reserved.