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  • 1
    Electronic Resource
    Electronic Resource
    An apparatus for the study of the kinetics and mechanism of hydrothermal reactions by in situ energy dispersive x-ray diffraction (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2442-2445 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design and implementation of a pressure cell for the study of hydrothermal reactions by in situ energy dispersive x-ray diffraction is described. The cell permits the study of both the kinetics and mechanism of formation of a wide range of important solid-state compounds such as zeolites and other microporous solids. Reactions can be studied over a wide range of temperature (5–230 °C) and autogenous pressure [0–400 psi (gauge)] conditions. The use of this apparatus is illustrated by a study on the synthesis of a microporous tin chalcogenide phase performed on Station 9.7 of the UK Synchrotron Radiation Source. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146451
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High resolution reflectivity diffractometer on Station 2.3 (Daresbury Laboratory) (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1224-1229 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high resolution reflectivity diffractometer (HRRD) has been recently commissioned on Station 2.3 at the SRS, Daresbury Laboratory. Using the instrument which is x-ray wavelength tunable, the characterization of the interface structure in an ion-assisted deposited Co/Cu multilayer has been carried out. In order to improve the electron density contrast of the sample, we have used an x-ray energy near the Cu K edge of 8.989 keV. By scanning the normal (specular), near normal (off specular), and parallel axes (transverse) of the surface, we have obtained useful reflectivity intensity data. By applying simulations to the data, we have determined a total roughness (rms) of 6.0±0.5 Å with a significant contribution from correlated interfacial roughness (4.2±0.2 Å). Other detailed structural information obtained has successfully demonstrated that the commissioned instrument is a viable tool for reflectivity studies. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148754
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of silicon substitution on the magnetic properties of Tb2Fe17 single crystals (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3305-3310 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth of single crystals Tb2Fe17−xSix (x=0, 1, 2, 3, and 3.3) by the Czochralski method is performed. The crystal structure and magnetic properties are investigated. The substitution of silicon for iron leads to the reduction of the lattice parameters, and the significant increase of the Curie temperature from 413 to 526 K. The mean field analysis shows that the Fe–Fe exchange interaction is much strengthened while the Tb–Fe one is slightly weakened by the introduction of silicon. The anisotropy constants up to the sixth order are calculated by fitting the magnetization process of the samples at 1.5 K under the field up to 65 kOe. In addition, a narrow domain wall pinning-dominated process caused by the substitution of Si for Fe is confirmed and analyzed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368484
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  • 4
    Electronic Resource
    Electronic Resource
    Simple and high-yield method for synthesizing single-crystal GaN nanowires (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1961-1963 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple and high-yield method involving vapor-liquid-solid wire-like growth mechanism was developed for the synthesis of GaN nanowires. In this process, the mixture of Ga and SiO2 reacted with ammonia in the presence of the Fe2O3 catalyst supported by Al2O3. The x-ray powder diffraction measurement and transmission electron microscopy observations confirmed that the synthesized GaN nanowires are single-crystal hexagonal wurtzite structure with diameters ranged from 10 to 50 nm and lengths up to several micrometers. Based on the fact that a small Fe dominant particle attached to one end of some nanowires, a growth model of the GaN nanowires was proposed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312853
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  • 5
    Electronic Resource
    Electronic Resource
    A Novel X-ray Diffractometer to Study the Texture of Materials (1996)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 3 (1996), S. 6-13 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An X-ray energy-dispersive diffraction technique to study the texture of materials using synchrotron radiation has been developed. The design and commissioning of the diffraction instrument are described. The technique was first applied to study a drawn-wire aluminum sample which has a well known deformation texture. To demonstrate its capability further, results obtained from an erbium evaporated thin film are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959501404X
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  • 6
    Electronic Resource
    Electronic Resource
    New high- and low-temperature apparatus for synchrotron polycrystalline X-ray diffraction (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 929-931 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A high-temperature furnace with an induction heater coil and a cryogenic system based on closed-cycle refrigeration have been assembled to enhance the non-ambient powder diffraction facilities at the Synchrotron Radiation Source, Daresbury Laboratory. The commissioning of the high- and low-temperature devices on the high-resolution powder diffractometer of Station 2.3 is described. The combined temperature range provided by the furnace/cryostat is 10–1500 K. Results from Fe and NH4Br powder samples are presented to demonstrate the operation of the apparatus. The developments presented in this paper are applicable to a wide range of other experiments and diffraction geometries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597015513
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  • 7
    Electronic Resource
    Electronic Resource
    High-Pressure Cell for the Study of In-Situ Hydrates Using Energy-Dispersive X-ray Diffraction (1996)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 3 (1996), S. 220-224 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A high-pressure low-temperature cell has been developed for in-situ diffraction studies of carbon dioxide and propane gas hydrate crystallization. The design and implementation of the cell, which can operate up to 3.5 MPa and down to 253 K, are described. Using synchrotron energy-dispersive X-ray diffraction, the first growth of the hydrate crystals from solution has been successfully observed. The lattice parameters of the hydrate crystals were found to be 11.927 (2) and 17.196 (2) Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049596007480
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  • 8
    Electronic Resource
    Electronic Resource
    Station 16.3: a High-Resolution Single-Crystal Diffraction Facility at the SRS, Daresbury (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 1263-1269 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: SRS station 16.3 is now a fully scheduled user facility for high-resolution and high-energy single-crystal X-ray diffraction. It is based on a large three-axis diffractometer, designed and constructed at Daresbury for a wide range of physics and materials science applications. Served by wiggler 16 (a 6 T superconducting wavelength-shifter), the station has access to a broad spectrum of photon energies, extending to over 50 keV, and is designed for simple polarization-state tuning by motorized height adjustment of all optical components. This paper outlines the key design features and some of the science projects carried out during the first year of operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598006803
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  • 9
    Electronic Resource
    Electronic Resource
    Angular Resolution of Parallel Foils on a Synchrotron Powder Diffractometer (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 1270-1274 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: In an attempt to improve the resolution in flat-plate diffraction geometry, a new set of parallel foils, 100 µm spacing, 365 mm long with an aperture of 20 × 20 mm2, has been commissioned. The study was carried out using the two-circle diffractometer of station 2.3 at the SRS. In order to properly quantify the improvements, a detailed and comparative study of the instrumental resolution using the new and existing foils, of 200 µm spacing, is reported. A number of cubic materials, BaF2, Si and CeO2, that are known to show well defined Bragg peaks over the full 2θ angular range available, were investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598007870
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