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  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Atomic layer epitaxy and structural characterization of InP and InAs/InP heterostructures (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2398-2405 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the growth and structural properties of InP, InAs/InP strained single quantum wells and short-period InAs/InP strained layer superlattices by atomic layer epitaxy. A self-limiting growth close to 1 monolayer/cycle has been obtained for InP and for InAs with low substrate temperatures between 350 and 360 °C. The samples were grown on InP (001) substrates and characterized by high resolution x-ray diffraction, grazing-incidence x-ray reflectometry, and Raman spectroscopy. The interference of x-ray wave fields in the grown structures observed by both types of x-ray measurements can be used to measure nondestructively the thickness of the deposited films with relatively high precision. High resolution x-ray diffraction and grazing-incidence x-ray reflectometry of the InAs/InP superlattices confirm the periodicity of the structures in agreement with theoretical predictions. Raman spectroscopy shows doublets of folded acoustic modes as well as InAs-like and InP-like confined longitudinal optical phonons in the InAs/InP superlattices. Results indicate that, despite the 3.2% lattice mismatch, atomic layer epitaxy is a powerful method for fabricating highly strained structures with atomically controlled heterointerfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356261
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of strain on confined optic phonons of highly strained InAs/InP superlattices (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4983-4989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured Raman scattering and high-resolution x-ray diffraction from highly strained [(InAs)4(InP)4]N short-period superlattices grown on InP substrates by atomic layer epitaxy at 355 °C. The InAs and InP confined phonons are observed in these highly strained short-period superlattices. The energy of the InAs confined longitudinal-optical phonon (LO) modes of a fully strained superlattice (with N=8) is blue shifted by about 10 cm−1 compared to the LO phonon of bulk InAs. This effect is explained by the large biaxial strain existing in the InAs layers. The observed frequency shift agrees with the lattice-mismatch strain given by elasticity theory and independently measured by high-resolution x-ray diffraction. No evidence of a frequency shift of the InP confined LO modes in the N=8 fully strained superlattice is observed, indicating that the strain is confined to the InAs layers. We show that in a partially relaxed superlattice (with N=20), the InAs layers are in compression, while the InP layers are in tension. In this case the InP confined LO1 phonons are red shifted by about 3 cm−1 compared to the InP LO1 phonons of the N=8 fully strained superlattice, and the shift of the InAs confined LO phonons with respect to the LO phonons of bulk InAs is also reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354303
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopic evidence of co-insertion of carbon atoms into Li intercalated layered compounds (1990)
    Springer
    Applied physics 51 (1990), S. 347-349 
    Details
    ISSN: 1432-0630
    Keywords: 68–65 ; 78–30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Co-insertion of solvent into layered compounds intercalated with lithium has been evidenced by Raman scattering measurements. The penetration of solvated species into the host is observed in samples prepared by an electrochemical technique as well as by direct chemical reaction in n-butyl lithium. The co-insertion is evidenced by the appearance of peaks in the spectral range 1200–1800 cm−1 which are attributed to vibrations due to carbon atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324318
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  • 4
    Electronic Resource
    Electronic Resource
    Raman spectroscopy of graphite in cast iron (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 23 (1992), S. 315-317 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman scattering spectra of carbon inclusions found in two cast iron samples were studied. From the observed spectra it was deduced that this carbon is made of good-quality microcrystals, 5 nm in size, in the planes of the threefold coordinated carbon.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250230512
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    Paper (German National Licenses)
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