STRUCTURAL CHARACTERISTICS OF La2O3 THIN FILM GROWN ON LaB6

Within the framework of hexagonal lanthanum oxide (h-La2O3) formation, lanthanum hexaboride film on sapphire substrate (LaB6/Al2O3) was oxidized at different temperatures (700-1000 °C) under reduced atmospheric pressure (1·10-2,1.5·10-1Torr) during 30 min. The composition evolution of La2O3/LaB6 str...

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Bibliographic Details
Published in:International journal of modern physics. Conference series 2012, Vol.15, p.61-66
Main Authors: KAFADARYAN, Y. A., PETROSYAN, S. I., BADALYAN, G. R., LAZARYAN, V. G., SHIRINYAN, G. H., AGHAMALYAN, N. R., HOVSEPYAN, R. K., SEMERJIAN, H. S., IGITYAN, A. S., KUZANYAN, A. M.
Format: Article
Language:English
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Summary:Within the framework of hexagonal lanthanum oxide (h-La2O3) formation, lanthanum hexaboride film on sapphire substrate (LaB6/Al2O3) was oxidized at different temperatures (700-1000 °C) under reduced atmospheric pressure (1·10-2,1.5·10-1Torr) during 30 min. The composition evolution of La2O3/LaB6 structure versus annealing temperature has been studied using XRD, FIR reflectivity spectroscopy, SEM and electron probe X-ray microanalysis (EDS). The annealing of the LaB6 film at T=700 °C under air pressure of 1·10-2 Torr generates thin La2O3 layer which exhibits as inferred from XRD the hexagonal phase. The hydratation of La2O3/LaB6/Al2O3 in distilled water for 30 min and postannealing at 900 °C under air pressure of 1.5·10-1 Torr transform h-La2O3 into hexagonal La(OH)3 phase accompanied monoclinic LaO(OH) and lanthanum oxide carbonate hydrate species.
ISSN:2010-1945
2010-1945
DOI:10.1142/S2010194512006964