Initial stages of cobalt-disilicide formation in mesotaxy
Article Abstract:
The first stages of cobalt-disilicide formation in mesotaxy have been studied. Doses ranged from 1% to 60% of the critical dose for formation of a uniform layer with observations for the low-dose range, 5% and below, where precipitate density is low, emphasized. Observation in post-implantation annealing at 1000 degrees C. showed contraction of the Co depth profile for all doses; formation of a secondary peak near the surface; and shifting of the peak toward the bulk. The secondary peak comes out only in samples with 3%+ of the critical dose. For interpretation of the occurrence of the secondary peak and the shift of the main peak it is necessary to have a model exceeding the standard ripening model used up to now in describing mesotaxy. More recent ripening-based concepts allow for a full description of the observations with a minimum of parameters, especially not requiring interaction with the complex defect profiles formed at first in implantation. Including precipitate-precipitate interactions and the role of diffusion screening properly is necessary.
Publication Name: Canadian Journal of Chemistry
Subject: Chemistry
ISSN: 0008-4042
Year: 1998
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FTIR analysis of the phase content in low-density polyethylene
Article Abstract:
Fourier transform infrared (FTIR) spectroscopy analysis and slow calorimetry has examined the phase content in low-density polyethylene (LDPE). The CH2 rocking vibrations in nonoriented films from a press or from solution were analyzed and three phases were found. In pressed films the orthorhombic, monoclinic-like phase, was found. In the other films amorphous forms were found. Quantitative measurement of two noncrystalline phases in nonstrained samples is a new finding for semicrystalline polymers and is probably generally true.
Publication Name: Canadian Journal of Chemistry
Subject: Chemistry
ISSN: 0008-4042
Year: 1998
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