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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    A secondary-ion-mass spectrometry study of magnesium diffusion in lithium niobate (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7552-7558 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed study of magnesium indiffusion in lithium niobate (LiNbO3) crystal is presented. The aim of the work was to obtain a comprehensive understanding of the diffusion process as a function of film thickness, temperature, diffusion time, crystal cut-direction. The secondary-ion-mass spectrometry technique was employed to obtain magnesium concentration depth profiles. Our results show that the strongest factor that controls the diffusion process is the temperature. A noticeable increase of the diffusion coefficient is observed with increasing temperature. The diffusion time has a small effect on the diffusion coefficient, but if the former is less than a certain value, the deposited MgO film does not diffuse completely. On the other hand, if it is quite long it will enter into the annealing regime. Diffusion parameters to realize buried waveguides (which reduce the coupling loss between single-mode fibers and diffused waveguides) have also been derived. The present studies could be important in consideration of the synthesis of LiNbO3 optical devices with improved optical qualities. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357988
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of bonding and valence states in YBa2Cu3O7−x through secondary-ion-mass spectrometry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2429-2432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The superconducting compound YBa2Cu3O7−x (YBCO) and oxides of copper (CuO and mixture of CuO and Cu2O) have been examined by secondary-ion-mass spectrometry (SIMS). The results support the fact that two kinds of copper (from the consideration of bonding and valence state) exist in YBCO—one in the basal planes of charge reservoir layers and the other in the conduction layers. The bonding of Cu-O in the CuO2 conduction layer unit is similar to that in CuO. No Cu+++ secondary ions could be detected in the SIMS spectrum, in agreement with electron spectroscopy for chemical analysis, extended x-ray-absorption fine structure, and electron probe microanalysis measurements reported earlier. A plausible explanation has been given for this.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353098
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  • 3
    Electronic Resource
    Electronic Resource
    Interband tunneling in nonparabolic semiconductors in the presence of an electric field (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3246-3250 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt is made to study the interband tunneling rate for small-gap semiconductors having Kane-type energy bands in the presence of an external electric field, taking InSb as an example for the purpose of numerical computations. The experimentally obtained tunneling currents, which may not be limited by the factor 2, can be better explained by this formulation. Thus, the present analysis is applicable for wider ranger of electric fields and are more consistent with the experimental results than that previously proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354599
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  • 4
    Electronic Resource
    Electronic Resource
    A study of interband magneto-optical transition in semiconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2086-2088 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An attempt is made to study the magneto-optical absorption for direct band parabolic semiconductors considering the k¯ dependence of the optical matrix element. Thus we have obtained the generalized expressions for the same coefficients which are consistent with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351645
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    Paper (German National Licenses)
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