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IR Laser Photodeposition of a-Fe/Si Films Developing Nanograins of Ferrisilicate, Iron Disilicide and Rare Hexagonal Iron Upon Annealing

IR Laser Photodeposition of a-Fe/Si Films Developing Nanograins of Ferrisilicate, Iron Disilicide and Rare Hexagonal Iron Upon Annealing

J Pola, M Urbanová, D Pokorná, S Bakardjieva, J Šubrt, Z Bastl, M A Gondal, H M Masoudi

Dalton Trans. 2012 Feb 14;41(6):1727-33.

PMID: 22159449

Abstract:

IR laser-induced gas-phase photolysis of Fe(CO)(5)-SiH(4) mixtures occurs as SiH(4)-photosensitized decomposition of Fe(CO)(5) is accelerated by products of this decomposition and it results in deposition of amorphous Si/Fe nanocomposite films. Analyses of the deposited and subsequently annealed solid films were made by FTIR, Raman and X-ray photoelectron spectroscopy, X-ray diffraction and electron microscopy. The deposited films are amorphous, contain crystalline nanostructures of iron silicide FeSi(2) and undergo atmospheric oxidation in topmost layers to iron oxide and hydrogenated silicon oxide. Upon annealing they develop nanocrystalline structures of ferrisilicate, Fe(1.6)SiO(4), carbon-encaged iron disilicide, FeSi(2), and very rare hexagonal (high-pressure) Fe surviving at ambient conditions. The mechanism of formation of these nanostructures is discussed in terms of gas-phase and solid-phase reactions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP12022990	Iron disilicide		12022-99-0	Price

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