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in creator/contributor: "Faber, J. Jr."  
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Sample environments at IPNS: present and future capabilities

Description: Argonne's Intense Pulsed Neutron Source, IPNS, was dedicated as a major user-oriented neutron scattering facility two years ago. Most instruments are now equipped to provide for sample environments in the temperature range 1.5 < T < 1300K. A special facility provides T < 1mK, and another provides pressures to 30kbar. Several environmental equipment designs are described that emphasize time-of-flight technique. Methods for achieving time-resolved experiments which take advantage of the IPNS puls… more
Date: February 1, 1984
Creator: Faber, J. Jr.
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Partner: UNT Libraries Government Documents Department
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Design study of a time of flight small-angle diffractometer for a pulsed neutron source

Description: The design study for a neutron SAS instrument at Argonne's proposed Intense Pulsed Neutron Source (peak thermal neutron flux 10/sup 16/ n/cm/sup 2/-sec) indicates that an effective high-resolution TOF SAS diffractometer can be constructed. The design features include a converging slit collimator, provision for 5 x 5 cm/sup 2/ sample cross sectional area, and a 1 x 1 m/sup 2/, two-dimensional detector. The fractional wavelength resolution of the instrument is negligibly small for all wavelengths… more
Date: January 1, 1977
Creator: Carpenter, J.M. & Faber, J. Jr.
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Partner: UNT Libraries Government Documents Department
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Neutron powder diffraction at a pulsed neutron source: a study of resolution effects

Description: The General Purpose Powder Diffractometer (GPPD), a high resolution ( d/d = 0.002) time-of-flight instrument, exhibits a resolution function that is almost independent of d-spacing. Some of the special properties of time-of-flight scattering data obtained at a pulsed neutron source will be discussed. A method is described that transforms wavelength dependent data, obtained at a pulsed neutron source, so that standard structural least-squares analyses can be applied. Several criteria are given t… more
Date: November 1, 1985
Creator: Faber, J. Jr. & Hitterman, R.L.
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Partner: UNT Libraries Government Documents Department
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Lattice shear distortions in fluorite structure oxides

Description: Crystallographic shear distortions have been observed in fluorite structure, single crystals of UO/sub 2/ and Zr(Ca)O/sub 2//sub-x/ by neutron-diffraction techniques. These distortions localize on the oxygen sublattice and do not require the presence of an external strain. The internal rearrangement mode in UO/sub 2/ is a transverse, zone boundary q vector = 2..pi../a (0.5, 0.0) deformation with amplitude 0.014 A. In Zr(Ca)O/sub 2-x/, the mode is a longitudinal, q vector = 2-/a (0,0,0.5) deform… more
Date: January 1, 1979
Creator: Faber, J. Jr.; Mueller, M.H. & Hitterman, R.L.
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Partner: UNT Libraries Government Documents Department
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Lattice thermal expansion effects in pure and doped cordierite by time-of-flight neutron diffraction

Description: The thermal expansion behavior of pure, Ge-doped and Li-doped hexagonal cordierites with respective compositions: 2Mg0 2Al2O3 5SiO2, 2Mg0 2Al2O3 4SiO2 GeO2, and 2Mg0 (2+x)Al2O3 (5-2x)SiO2 xLi2O with x = .174, was investigated using time-of-flight neutron powder diffraction at temperatures from 22 to 750C in vacuum. The data were refined in space group P6/mcc using the Rietveld method. The lattice thermal expansion curves of all 3 samples were quite similar. The negative c axis expansion is asoc… more
Date: October 1, 1985
Creator: Predecki, P.K.; Haas, J.; Faber, J. Jr. & Hitterman, R.L.
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Partner: UNT Libraries Government Documents Department
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A neutron diffraction study of non-stoichiometric Mn/sub 1-x/O

Description: Rietveld analysis of Bragg intensities from in-situ neutron powder diffraction of nearly stoichiometric Mn/sub 0.9990/O reveals the presence of several percent Mn interstitials. Similar to isostructural Fe/sub 1-x/O, the cation interstitials are tetrahedrally coordinated in the rocksalt structure (Fm3M). 27 refs., 2 figs., 1 tab.
Date: February 1, 1988
Creator: Radler, M.; Cohen, J.B. & Faber, J. Jr.
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Partner: UNT Libraries Government Documents Department
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