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Digitale Medien

Electrical activity and precipitation behavior of copper in gallium arsenide (1995)

Leon, R. ; Werner, P. ; Yu, K. M. ; [weitere]

Springer

Applied physics 61 (1995), S. 7-16

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ISSN: 1432-0630

Schlagwort(e): 61.70.-r ; 72.80.Ey ; 71.55.Eq

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The electrical properties and preferred lattice site of Cu in GaAs were investigated combining electrical and optical measurements with ion beam and structural analysis. From this comprehensive study it was determined that Cu introduces two levels in the band gap, that the concentration of electrically active centers introduced by Cu diffusion is considerably smaller than the total Cu concentration, that this ratio of electrically active to total Cu concentration depends strongly on the cooling speed after diffusion, and that the portion of Cu that remains electrically inactive forms Cu-Ga precipitates.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01538203

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Digitale Medien

Self-generated oscillations in continuous crystallizers: Part I. Analytical prediction of the oscillating output (1975)

Yu, K. M. ; Douglas, J. M.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 21 (1975), S. 917-924

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: The theory of nonlinear oscillations should provide a useful tool for studying both forced and self-generated oscillations in continuous crystallizers. The application of the theory is described in this paper for the case of self-generated oscillations in a MSMPR (mixed-suspension, mixed product removal) isothermal crystallizer. Although the process parameters do not correspond to typical industrial conditions, the results indicate that for the Class I system studied higher yields sometimes can be obtained from the periodic process than the steady state design. Thus, there may be some situations where oscillatory operation is advantageous.

Zusätzliches Material: 5 Ill.