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The DX center and other tin-related defects in AlGaAs semiconductors (1994)

Glick, S. H. ; Greco, L. A. ; Williamson, D. L.

Springer

Hyperfine interactions 93 (1994), S. 1401-1407

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ISSN: 1572-9540

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Al x Ga1-xAs semiconductors doped with both natural and enriched119Sn have been studied by Mössbauer spectroscopy (MS) to help to determine the atomic-scale nature of a deleterious, deep-level defect known as the DX center. Spectra have been acquired in the dark at 76 K and under sub-bandgap illumination at 4 or 10 K to distinguish the DX center from the substitutional shallow donor defect. Although electrical differences are clearly detected in these two states, no difference in the Mössbauer spectra are observed. Unexpected high Sn contents, determined by quantitative MS, demonstrate a large non-electrically active Sn fraction in some samples and this may be obscuring the observation of the DX center by both X-ray absorption spectroscopy and MS. Grinding the single-crystal layers into fine powders leads to an Sn defect that is attributed to a surface-oxidized site.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02072884

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The hydrolytic stability of mitrathane (a polyurethane urea) - an x-ray photoelectron spectroscopy study (1988)

Paynter, R. W. ; Askill, I. N. ; Glick, S. H. ; [et al.]

Hoboken, NJ : Wiley-Blackwell

Journal of Biomedical Materials Research 22 (1988), S. 687-698

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ISSN: 0021-9304

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine , Technology

Notes: The hydrolytic stability of microporous Mitrathane polyetherurethane urea vascular prostheses has been evaluated at pH 7 and pH 9, at 37°, 60°, and 80°C for time periods of up to 968 days. Mechanical strength was evaluated using a hydrodynamic burst test and surface chemical changes by x-ray photoelectron spectroscopy. The samples held at 80°C showed the greatest mechanical strength loss which corresponded to the hydrolysis of the urethane groups. It was concluded that the gross in vivo surface degradation of Mitrathane prostheses, observed after six months, could not have been caused by simple chemical hydrolysis alone, as the polymer was found to be stable at 37°C for at least 11 months.

Additional Material: 5 Ill.