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

Journal Article · Wed Dec 13 23:00:00 EST 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.04.025· OSTI ID:20895203

Koc, S Naci ^[1]; Oksuzomer, Faruk ^[1]; Yasar, Erdem ^[2]; Akturk, Selcuk ^[2]; Gurkaynak, M Ali ^[1]

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1. Department of Chemical Engineering, Istanbul University, Istanbul (Turkey)
2. Department of Physics, Kirikkale University, Kirikkale (Turkey)

LaAlO{sub 3} 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 deg. 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 LaAlO{sub 3} formation temperature and uniform rhombohedral crystals. But conventionally dried sample, prepared with iso-propanol has smallest agglomerates at 1000 deg. C and does not show clear crystallization temperature in DTA analysis. The XRD peaks of LaAlO{sub 3} crystal are observed at 600 deg. C for all samples prepared by various sol-gel conditions.

• OSTI ID: 20895203
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 41; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
BUTANOLS
CHELATING AGENTS
CRYSTALLIZATION
CRYSTALS
DIFFERENTIAL THERMAL ANALYSIS
GLYCOLS
LANTHANUM
LANTHANUM COMPOUNDS
MICROSTRUCTURE
MODIFICATIONS
MORPHOLOGY
NANOSTRUCTURES
PROPANOLS
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION