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  • 11
    Electronic Resource
    Electronic Resource
    High-resolution electron microscopy and diffraction studies of fibrous amphiboles (1975)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 794-801 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Fibrous specimens of tremolite, amosite, crocidolite and anthophyllite have been studied by electron diffraction and high-resolution microscopy. Amosite (and to a lesser extent crocidolite) are shown to be subject to frequent twinning on (100) leading to stacking disorder, and an explanation is provided of previously supposed anomalies in their diffraction patterns [Chisholm (1973), J. Mater. Sci. 8, 475-483]. Tremolite is sensibly free from these defects and this is explained in terms of crystal chemistry. The presence of Wadsley defects of the type suggested by Chisholm has been confirmed in tremolite, amosite and anthophyllite, and these defects have been shown to correspond to intercalation of lamellae of triple-chain structure parallel to (010). In anthophyllite these lamellae are observed to segregate into domains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739475001714
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  • 12
    Electronic Resource
    Electronic Resource
    Ordering of the point defects in nonstoichiometric crystals of Nb12O29 (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 670-670 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Iijima's [Acta Cryst. (1975). A31, 784-790] electron microscopic study of oxidized orthorhombic Nb12O29 agrees in all respects with results previously published [Browne & Anderson (1974). Proc. Roy. Soc. A339, 463-482; Diffraction Studies of Real Atoms and Real Crystals, p. 157, Australian Academy of Science], which showed the observed superlattice to be that of a metastable modification of Nb2O5. Subsequent partial transformation of this to the stable H-Nb2O5 structure accounts for the degradation of the superlattice on continued heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947600140X
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  • 13
    Electronic Resource
    Electronic Resource
    High-resolution imaging of the ferroelectric perovskite Ba2Bi4Ti5O18 (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 119-125 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The ferroelectric material Ba2Bi4Ti5O18 has been examined by high-resolution electron microscopy at 200 and 500 kV. With the directly interpretable resolution limit in each case extending to better than 2.5 Å, it was demonstrated that both the A-cation and B-cation positions could be resolved and, furthermore, that analysis of structural disorder at this level of resolution allowed an explanation of some observed lattice defects. In particular, unit shifts of a perovskite cell along a bismuthate sheet were identified as occurring in the manner previously postulated, and a Burgers vector circuit analysis around a low-angle domain boundary permitted the formulation of a model for the atomic configuration at the boundary. The implications of these observations for the study of perovskites generally are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000193
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  • 14
    Electronic Resource
    Electronic Resource
    CONTACT SULFURIC ACID FROM SULFUR (1948)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 40 (1948), S. 1340-1349 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50464a002
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  • 15
    Electronic Resource
    Electronic Resource
    Changes in Hypothalamic Responsiveness to Testosterone in Male Barbary Doves ( Streptopelia risoria ) (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 176-177 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This problem does not seem to have been studied in mammals. I have found, however, that the effectiveness of intramuscular testosterone treatments in re-establishing male courtship behaviour in Barbary doves declines with time after castration: thus the re-establishment of courtship in castrates ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/222176a0
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  • 16
    Electronic Resource
    Electronic Resource
    Rates of solvolysis of m-fluorobenzoyl chloride and m-trifluoromthylbenozyl chloride in isopropyl alcohol-benzene solutions. The cosolvent effect (1967)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 71 (1967), S. 1374-1381 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100864a029
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  • 17
    Electronic Resource
    Electronic Resource
    An ordered Ga2Te3 phase in the ZnTe/GaSb interface (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6566-6570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Ga2Te3 interfacial phase has been observed in a ZnTe/(001)GaSb heterostructure by high resolution electron microscopy under special imaging conditions. This phase exists in domains 5–10 nm in size on the ZnTe side of, and usually 2–4 nm away from, the interface. A structural model has been proposed for this phase that is derived from the sphalerite cell with cation sites occupied either fully (occupancy 1) or partially (occupancy 5/9) by Ga atoms. The fully occupied Ga sites form a regular array of uninterrupted chains along the [110] direction of the sphalerite unit cell. The partially occupied Ga sites can also be considered as forming chains containing both Ga atoms and vacancies along the [110] direction. Within these chains vacancies are highly mobile, resulting in an average Ga occupancy of 5/9. The unit cell of Ga2Te3 is orthorhombic with the space group Amm2. The lattice parameters of the unit cell have been derived from electron diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355118
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  • 18
    Electronic Resource
    Electronic Resource
    Precipitation of oxygen at 485 °C: Direct evidence for accelerated diffusion of oxygen in silicon? (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3419-3424 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Prolonged annealing of Czochralski silicon at 485°C leads to the formation of a number of defects which is accompanied by a reduction in the concentration of oxygen interstitials in the matrix. High-resolution electron microscopy has been used to investigate the structure of these defects which are basically of three types: (1) ribbonlike, (2) looplike defects which result in local lattice strains and hence are also visible in conventional transmission electron microscopy, and (3) dark regions visible in high-resolution micrographs with no lattice strains. Based on image characteristics and a comparison of the reduction in interstitial oxygen, from infrared spectroscopy, with the sizes of the ribbons, estimated from high-resolution micrographs, it is proposed that the ribbonlike defects are, in fact, the coesite phase which forms at prolonged anneals of the same material at the higher temperatures of 630–650°C. Using a simple model for the diffusion of oxygen to ribbons, the diffusivity of oxygen in silicon is estimated to be enhanced by nearly four orders of magnitude at 485°C! It is proposed that the looplike defects are extrinsic Frank loops which act as sinks for the interstitial silicon ejected during the oxygen precipitation. The fading away of the dark regions under electron irradiation in the microscope suggests that they are agglomerates of point defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335760
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  • 19
    Electronic Resource
    Electronic Resource
    Uniform GaAs quantum dots in a polymer matrix (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 189-191 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel technique suitable for the preparation of uniformly sized nano- and microparticles of a wide range of compound semiconductors embedded in different polymers is described. Optical absorption spectra and high resolution electron micrographs of a new composite material—GaAs quantum dots in a polymer matrix—are presented and are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112667
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  • 20
    Electronic Resource
    Electronic Resource
    Surface band splittings: Theory with application to He/graphite
    Amsterdam : Elsevier
    Surface Science Letters 93 (1980), S. A94 
    Details
    ISSN: 0167-2584
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-2584(80)90319-9
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