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Optical absorption edge of semi-insulating GaAs and InP at high temperatures (1997)

Beaudoin, M. ; DeVries, A. J. G. ; Johnson, S. R. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 70 (1997), S. 3540-3542

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: The temperature dependences of the optical absorption edges of semi-insulating GaAs and InP have been measured from room temperature to 905 °C and 748 °C, respectively, with accuracies of ±1 °C at room temperature and ±5 °C at 900 °C. The temperature dependence of the optical absorption edge is adequately reproduced by an Einstein model although the Varshni model gives an improved fit to the band gap. Finally, the widths of the absorption edges are correlated with ionicity. © 1997 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.119226

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The effect of a magnetic tape coating process on the structure and properties of a semi-crystalline polymer (1986)

Warbington, R. H. ; Crowe, W. C. ; Seferis, J. C. ; [et al.]

Springer

Colloid & polymer science 264 (1986), S. 683-690

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ISSN: 1435-1536

Keywords: Semi-Crystalline Polymers ; orientation ; crystallinity ; magnetic coating ; processing

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract A combination of structure identifying and bulk property experiments were combined with a two-phase analytical methodology to elucidate the influence of a magnetic tape coating process on the substrate polymer film. Employing a typical tape manufacturing process that utilizes coating, drying, and calendering stages, polyethylenete-rephthalate polymer film samples with and without the magnetic coating were prepared. Experiments and modeling studies performed on these samples demonstrate that the drying and calendering processes may increase the crystallinity and noncrystalline orientation of the substrate film. In addition, dynamic mechanical experiments identified a viscoelastic transition at 50 °C for the PET substrate film sample which is near the glass transition of the magnetic coating utilized. Overall, the results of this investigation provide a basis for evaluating structure property interrelations of polymer-based magnetic tapes.