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  • International Union of Crystallography (IUCr)  (8)
  • American Geophysical Union  (1)
  • 2005-2009  (1)
  • 1985-1989  (2)
  • 1970-1974  (6)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Coherent-scattering amplitude of 243Am and 244Cm (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 667-671 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Neutron diffraction experiments have been completed on 243AmO2 and 244Cm2O3. The coherent-scattering amplitude of 243Am, relative to a value of 0.58 × 10-12 for oxygen, is 0.76 (1) × 10-12 cm. The value for curium is ̃0.7 × 10-12 cm, which cannot be determined accurately in this experiment because both C-type (cubic, a = 11.0 Å) and A-type (hexagonal, isostructural with La2O3) Cm2O3 are present in the sample. Some of the difficulties in performing neutron diffraction experiments on these radioactive isotopes, which exhibit self-heating and spontaneous fission, are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474001598
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  • 2
    Electronic Resource
    Electronic Resource
    Neutron diffraction study of α-uranium at low temperatures (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 129-136 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740870002066
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent scattering amplitude of 240Pu and 242Pu (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 2284-2284 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740871005685
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  • 4
    Electronic Resource
    Electronic Resource
    Structural transitions at low temperatures in vanadium deuterides (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 6 (1973), S. 206-216 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray and neutron-diffraction techniques have been used to ascertain the structures of vanadium deuterides with compositions between V2D and V4D3 over a temperature range 5–425 °K. The β phase, V2D, has a monoclinic crystal structure at room temperature with a∼c = 4.46; b = 3.00 Å, β = 95.5°. The deuterium atoms prefer octahedral interstitial sites. Near 425 °K this phase transforms to a b.c.c. phase, and the deuterium atoms prefer tetrahedral sites. The b.c.c. phase of V4D3 has been designated α′ and transforms to α′′ at about 220 °K. This transition is an ordering of deuterium as shown by additional neutron-diffraction peaks. This α′′ structure can be indexed with a∼c∼4.46; b∼3.00 Å; β = 90°. Below 160 °K an additional neutron peak appears at 2&thgr; = 12° which indicates a doubling of the b lattice parameter. This transformation to α′′′ phase involves further ordering. The metal sublattice in α′ and α′′′ is very near b.c.c. Therefore, the neutron patterns do not allow a determination of octahedral or tetrahedral site occupancy. The exact crystal structure cannot be determined. The V–D system is not completely analogous to the V–H system and some of the differences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889873008496
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  • 5
    Electronic Resource
    Electronic Resource
    A neutron diffraction study of ferroelectric KFCT, K4Fe(CN)6.3D2O, above the Curie temperature (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 559-567 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A neutron diffraction study of deuterated potassium ferrocyanide trihydrate (KFCT) has been made above the ferroelectric Curie temperature. The monoclinic form, space group A2/a (No. 15), has a = 9.42, b = 17.01, c = 9.38 Å, and β= 90.03° at 20°C. Since all of the large crystals of KFCT were twinned by a 90° rotation about the b axis, data from both overlapped and nonoverlapped reflections were used in the determination of the structure. Refinement by a modified least-squares method that accounted for the overlapped data led to a weighted R value on F2 (3678 reflections) of 4.8%. The corresponding R on F is 4.9%. The disordered water molecules are of two types: one is disordered into two positions related by a twofold axis parallel to b: the other is disordered into two positions that are related by an approximate 90° rotation in the plane of the molecule. Both types of water molecules show O–D ...O or O–D...N bonding. The Fe(CN)4−6 octahedra are regular and the potassium ions are loosely surrounded by O and N atoms. This analysis has elucidated the role of the water molecules in the ferroelectric switching mechanism. The [{\bar 1}01] ferroelectric axis in this crystal can be explained on the basis of the dipole moment and orientation of the water molecule dipoles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739470001407
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  • 6
    Electronic Resource
    Electronic Resource
    Neutron diffraction cryo-orienter (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 289-294 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The cryo-orienter is used for neutron diffraction studies of single crystals between liquid helium and room temperatures. It combines a double Dewar cryostat with a three-circle goniostat. The temperature of the crystal is controlled by a combination of exchange gas and a bridge circuit to a stability of ±0.01 Kelvin degree. A ring assembly allows the cryostat to be angularly displaced ±50° from vertical (χ), and to be rotated 360° (φ), which provides crystal motion about two axes with ±0.01° precision. The ring assembly can be rotated about the diffraction vector. Crystals can be mounted along a non-major zone and sufficient data can then be collected with one crystal mounting. The ARCADE computer system controls the entire data collection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870006313
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  • 7
    Electronic Resource
    Electronic Resource
    Structure of Cs6Zn5(MoO4)8 (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 184-186 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187096501
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  • 8
    Electronic Resource
    Electronic Resource
    Structure of β-uranium (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 89-96 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768187009406
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  • 9
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    The free oscillations of the world ocean in the period range 8 to 165 hours including the full loading effect (2007)
    American Geophysical Union
    Details
    Publication Date: 2007-03-01
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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