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  • 1
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering from a bisphenol A carbonate/dimethylsiloxane copolymer under uniaxial external stretch (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 418-421 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00191a076
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  • 2
    Electronic Resource
    Electronic Resource
    The electron density of beryllium derived from 0·12 Å γ-ray diffraction data (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 763-769 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A large set of structure factors for beryllium has been measured with a 0.12 Å γ-ray diffractometer. The present data are in good agreement with other recent X-ray and γ-ray diffraction measurements. Extinction was significant though not very strong. Deformation density maps confirm that the bonding goes through the tetrahedral holes of the hexagonal close-packed structure. Comparisons with band-structure calculations indicate that the local-density approximation to the density functional theory is valid for beryllium. The quality of the data, combined with the earlier experimental results, is sufficient to demonstrate that the structure factors are sensitive to the valence electron hybridization even at high momentum transfer [(sin θ)/ λ 〉 0.75 Å-1]. Core electron deformation is a much smaller effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387098556
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron diffraction measurement of diffuse scattering in VC0.75 (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 597-599 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The location of diffuse intensity originally observed in electron diffraction patterns of short-range-ordered VC0.75, has been confirmed by neutron diffraction experiments on a four-circle diffractometer. A new set of short-range order parameters has been calculated on the basis of these accurate intensity data and the agreement between experimental results and theoretical predictions for short-range-ordered compounds with NaCl related structure has been improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474001392
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  • 4
    Electronic Resource
    Electronic Resource
    Order–disorder phase transition in dichlorodurene (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 384-388 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of dichlorodurene in the ordered phase was determined from neutron diffraction data at 70 K with the help of intra- and intermolecular potential calculations already published [Messager & Sanquer (1974). Mol. Cryst. Liq. Cryst. 26, 373-380]. The space group is the same as at room temperature, P21/a, but the cell parameters are integer multiples of those at room temperature, and there are three molecules in the asymmetric unit, instead of half a molecule. The phase transition is of order-disorder type and the first-order nature of this transition is established by the observation of a weak hysteresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478000789
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  • 5
    Electronic Resource
    Electronic Resource
    Secondary extinction and absolute structure factors in X-ray diffraction: determination by polarization variation (1984)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 261-263 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: If a rocking curve is measured in symmetric Laue geometry for two different X-ray polarizations, and the incident beam meets the geometrical conditions for diffraction, i.e. the incident beam is much less divergent than the sample mosaic, then the intensity ratio Robs, for the intensities measured with each polarization, will depend upon the reflectivity at each point on the rocking curve. From the variation of Robs vs the observed intensity, Iobs, the absolute reflectivities and secondary extinction can be determined. If absorption is properly treated, then all data taken in this geometry should lie on a single curve of Robs vs Iobs. Failure to fit this curve is evidence that the sample has other processes occurring such as multiple scattering or primary extinction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767384000520
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  • 6
    Electronic Resource
    Electronic Resource
    Treatment of secondary extinction and multiple scattering in polarized neutron scattering: an improved method. II. Application to nickel (1984)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 24-31 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The flipping ratios for polarized neutron scattering from the first six reflections in Ni have been measured on a series of samples of varying thickness and perfection and at a number of wavelengths. The results were corrected for secondary extinction on a point-by-point basis, using the measured absolute reflectivities, and multiple scattering was detected using conservation of neutrons. No adjustable parameters were used, and all data, except those from a rather perfect specimen which showed both primary and secondary extinction, agree to within the experimental accuracy after extinction correction. A diffuse scattering process with spin dependence was also detected, and the flipping ratios corrected for this. The corrected values differ somewhat from the values given by Mook [Phys. Rev. (1966), 14B, 495-501].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767384000052
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  • 7
    Electronic Resource
    Electronic Resource
    Treatment of secondary extinction and multiple scattering in polarized neutron scattering: an improved method. I. Method (1984)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 16-23 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new method for the treatment of secondary extinction in polarized neutron diffraction data has been developed. As in previous models, the Zachariasen solutions to the Darwin intensity transfer equations are used, but in this case the extinction corrections are made on a point-by-point basis across the rocking curve and the corrections are determined by the absolute reflectivity at each point. There are no adjustable parameters (other than background). Measurement of the reflectivity also provides a simple test for multiple scattering, since the sum of diffracted and transmitted intensities should equal the direct-beam intensity, corrected for absorption, if no multiple scattering is present. The present method should give more reliable results than parametrized models where the correlation between the extinction and other parameters, such as the scale factor and temperature factors, are important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767384000040
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  • 8
    Electronic Resource
    Electronic Resource
    Resolution analyses for Mössbauer diffraction: resolved TDS profiles in silicon (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 638-645 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The resolution function for Mössbauer γ-ray scattering and the thermal diffuse scattering (TDS) near the 444 reflection in silicon have been measured with high-intensity Mössbauer radiation from the 46.48 keV transition in 183W. A general analysis of the resolution function has been carried out for the first time which shows that its energy and momentum components can be factored independently with the energy resolution being determined by the Mössbauer resonance. The half-widths of the momentum resolution ellipsoid were measured to be 0.011, 0.11 and 1.13 Å-1 in the transverse, longitudinal and vertical directions, respectively. The ratios of these half-widths are significantly different from those commonly encountered in neutron scattering. These analyses indicate that the observed broad distribution of inelastic scattering in the TDS profiles is consistent with published elastic constants for silicon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387098799
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  • 9
    Electronic Resource
    Electronic Resource
    Neutron diffraction and magnetic studies of RFe12−xTxCy (R=Y,Er; T=V,Ti,Mo) alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5522-5524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: RFe12−xTxCy (R=Y,Er; T=V,Ti,Mo) alloys were prepared by rf induction melting and analyzed using neutron powder diffraction and superconducting quantum interference device (SQUID) measurements. Rietveld analysis of the neutron diffraction data indicates that V, Ti, and Mo atoms all prefer the 8i sites. The refined amount of carbon atoms found in the interstitial sites from neutron diffraction data is significantly less than the nominal carbon content. All samples have the easy direction along the c axis. The Er sublattice couples to the Fe sublattice antiferromagnetically. The average Fe site moments range from 1.3 to 2.8 μB. The anisotropies of the crystal structures are found to relate to both the rare earth atoms and the stabilizing transition metal atoms. The SQUID measurements show that all samples have a Curie temperature near 600 K. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362297
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  • 10
    Electronic Resource
    Electronic Resource
    Site affinity of substituents in Nd2Fe17−xTx (T=Cu,Zr,Nb,Ti,V) alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5939-5941 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to understand the magnetic properties of the substituted rare-earth-iron alloys, it is especially important to know the location of the substitutional atoms within the iron lattice. The site distributions of some nontransition-metal substituents in the substituted Nd2Fe17−xTx alloys have previously been reported. Here we report the site distributions of some transition-metal substituents (Cu,Zr,Nb,Ti,V) in the Nd2Fe17−xTx alloys and compare them with those of the nontransition-metal substituted compounds. Rietveld analysis of neutron powder diffraction data indicates that the nontransition-metal substituents show very similar site affinity at low substituent content. For example Al, Ga, and Si all prefer the 18h sites. The transition-metal substituents show a more complex site affinity. Ti and V atoms strongly prefer the 6c sites, Cu atoms prefer the 9d and 18f sites, Nb atoms prefer the 6c and 18h sites, and Zr atoms prefer 6c and 18f sites. It was also noted that the site affinity can change if carbon is included in the melting procedure of the sample preparation. The superconducting quantum interference device measurements show that all the substituted compounds have a Curie temperature higher than the unsubstituted parent compound. The relationship between the site distribution of substituents and the magnetic properties of the substituted Nd2Fe17−xTx alloys is discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362113
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