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1

Digitale Medien

Probing extra-framework cations in alkali- and alkaline-earth-metal Linde type A zeolites by Fourier transform far-infrared spectroscopy (1988)

Baker, Mark D. ; Godber, John ; Helwig, Kate ; [weitere]

s.l. : American Chemical Society

The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 6017-6024

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Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie , Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/j100332a036

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2

Digitale Medien

Impurity-induced layer disordering of high gap Iny(AlxGa1−x)1−yP heterostructures (1988)

Deppe, D. G. ; Nam, D. W. ; Holonyak, N. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 52 (1988), S. 1413-1415

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Data are presented showing the impurity-induced layer disordering (IILD), via low-temperature (600–675 °C) Zn diffusion, of In0.5(AlxGa1−x)0.5P quantum well heterostructures and an In0.5Al0.2Ga0.3P-GaAs heterojunction grown using metalorganic chemical vapor deposition. Secondary ion mass spectroscopy, transmission electron microscopy, and photoluminescence are used to confirm IILD, which occurs via atom intermixing on the column III site aided by column-III-atom interstitials. In addition, high-temperature anneals (800–850 °C) are performed on the same crystals to confirm the thermal stability of the heterointerfaces.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.99132

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3

Digitale Medien

Comparison of SiIII-SiV and SiIII-VIII diffusion models in III-V heterostructures lattice matched to GaAs (1988)

Deppe, D. G. ; Plano, W. E. ; Baker, J. E. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 53 (1988), S. 2211-2213

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The diffusion of SiIII-SiV neutral pairs versus the diffusion of SiIII-VIII complexes in III-V crystals is compared in the light of experimental data showing the effect of Si diffusion on self-diffusion of column III and column V lattice atoms. Secondary-ion mass spectroscopy is used to compare the enhanced diffusion of column III or column V atoms in several different Si-diffused heterostructures closely lattice matched to GaAs. Enhancement of the lattice-atom self-diffusion, via impurity diffusion, is found to occur predominantly on the column III lattice. Supporting the SiIII-VIII diffusion model, these data indicate that the main native defects accompanying the Si diffusion are column III vacancies, which diffuse directly on the column III sublattice.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.100284

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4

Digitale Medien

Sensitivity of Si diffusion in GaAs to column IV and VI donor species (1988)

Deppe, D. G. ; Holonyak, N. ; Baker, J. E.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 52 (1988), S. 129-131

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Secondary ion mass spectroscopy and carrier concentration measurements are used to characterize Si diffusion into GaAs wafers containing two fundamentally different forms of donors, the column IV donors Si or Sn and the column VI donors Se or Te. A decrease in the Si diffusion rate is found in GaAs containing the column VI donors compared to the column IV donors. This trend is consistent with the model in which the Si diffuses as donor-gallium-vacancy complexes. The decrease in the Si diffusion coefficient is attributed to the greater binding energy of column VI donor-gallium-vacancy nearest-neighbor complexes, thus reducing the concentration of free-gallium vacancies available to complex with the Si.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.99072

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5

Digitale Medien

Waveguiding in spun films of soluble polydiacetylenes (1988)

Townsend, P. D. ; Baker, G. L. ; Schlotter, N. E. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 53 (1988), S. 1782-1784

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: In prism coupling experiments, the guiding of 1.06 μm light over 3 cm pathlengths was demonstrated in thin spun films of soluble polydiacetylenes. From measurements of the intensity of scattered light, we estimate the transmission losses in the films were as low as 1 dB/cm. Although spun films appeared isotropic when examined under polarized light, the coupling angle observed for the TM waveguide mode was ∼6° higher than that of the TE mode, implying that the films were istropic in the plane of the film, but the refractive index normal to the plane of the film was lower.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.99779

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6

Digitale Medien

An electron channeling study of polycrystalline YBa2Cu3Ox (1988)

Verhoeven, J. D. ; Gibson, E. D. ; Chumbley, L. S. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 761-765

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: An electron channeling study has been done on large grained YBa2Cu3Ox samples. Selected area channeling patterns (SACP) were used to examine several dozen grains on electropolished surfaces and it was demonstrated that (a) the twin planes observed in polarized optical light microscopy lie parallel to {110} crystal planes, and (b) the long flat sides of high aspect ratio grains are formed by basal planes, and the shorter sides are formed by either (010), (100), or {110} planes. A majority of the large grains examined were found to contain subgrains, misaligned by 0.5°–1° and ranging in size from less than 3 to 20 μm. The origin of the subgrains is not understood.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.341921

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7

Digitale Medien

High-power soliton generation at microwave frequencies (1988)

Ikezi, H. ; Wojtowicz, S. S. ; Waltz, R. E. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 3277-3281

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We point out that the creation of a soliton pulse train in a nonlinear-dispersive system can be used for the generation of high-power microwave bursts. A modulated transmission line with an appropriate nonlinear dielectric is proposed. The nonlinear wave evolution is analyzed and requirements for the dielectric material are found. Problems associated with the material are discussed. Low-power experimental demonstrations of these concepts are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.341517

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8

Digitale Medien

Impurity diffusion and layer interdiffusion in AlxGa1−xAs-GaAs heterostructures (1988)

Deppe, D. G. ; Holonyak, N. ; Plano, W. E. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 1838-1844

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Data are presented and a model describing the diffusion of the donor Si in GaAs from grown-in dopant sources. In addition, the effects of background impurities on Si diffusion and layer interdiffusion in AlxGa1−xAs-GaAs superlattices are described. These results are obtained on epitaxial GaAs samples with alternating doped and undoped layers and on AlxGa1−xAs-GaAs superlattices with doped (Si or Mg) layers. The layer-doped GaAs and the AlxGa1−xAs-GaAs superlattices have been grown using metalorganic chemical vapor deposition and are characterized using secondary ion mass spectroscopy and transmission electron microscopy. Different annealing conditions are used to study the interaction between the grown-in impurities and the native defects of the crystal controlling the diffusion processes. The model describing the impurity diffusion and layer (Al-Ga) interdiffusion is based on the behavior of column III vacancies, VIII, and column III interstitials, IIII, and the control of their concentration by the position of the crystal Fermi level and the crystal stoichiometry. Experimental data show that n-type AlxGa1−xAs-GaAs superlattices undergo enhanced layer interdiffusion because of increased solubility of the VIII defect, while enhanced layer interdiffusion in p-type superlattices is caused by an enhanced solubility of IIII. The model employed is consistent with the experimental data and with the data of previous work.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.341759

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9

Digitale Medien

Temporal contraction of solitons in a nonuniform transmission line (1988)

Ikezi, H. ; Wojtowicz, S. S. ; Waltz, R. E. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 6836-6838

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We present experimental and numerical evidence of temporal contraction of electromagnetic pulses propagating in nonuniform, nonlinear dispersive transmission lines. The pulses are both contracted and amplified by orders of magnitude.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.341998

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10

Digitale Medien

Oscillating field current drive experiments in a reversed field pinch (1988)

Schoenberg, K. F. ; Ingraham, J. C. ; Munson, C. P. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 31 (1988), S. 2285-2291

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Steady-state current sustainment by oscillating field current drive (OFCD) utilizes a technique in which the toroidal and poloidal magnetic fields at the plasma surface are modulated at audio frequencies in quadrature. Experiments on the ZT-40M reversed field pinch [Fusion Technol. 8, 1571 (1985)] have examined OFCD over a range of modulation amplitude, frequency, and phase. For all cases examined, the magnitude of the plasma current is dependent on the phase of the modulations as predicted by theory. However, evidence of current drive has only been observed at relatively low levels of injected power. For larger modulation amplitudes, the data suggest that substantial current drive is offset by increased plasma resistance as a result of modulation enhanced plasma–wall interactions. The initial experimental results and supporting theoretical interpretations of OFCD are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.866629

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