Browsing by Author "Klooster, WT"

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    Crystal and molecular structure of dichloro(1,10-phenanthroline)dimethyltin(IV), Me2Sn(1,10-phenanthroline)Cl-2, determined by neutron diffraction
    (Oldenbourg Wissenschaftsverlag GmbH, 2008-12) Klooster, WT; Piltz, RO; Tiekink, ERT
    The tin atom in Me2Sn(phen)Cl-2 is located on a crystallographic site of symmetry m2m and exists within a distorted octahedral geometry defined by a C2Cl2N2 donor set with the tin-bound methyl groups occupying trans- positions. A two-dimensional array stabilised by C-H center dot center dot center dot Cl interactions is established in the crystal structure. Crystal data for Me2Sn(phen)Cl-2: C14H14Cl2N2Sn, M = 399.90, orthorhombic space group Cmcm, a = 11.359(2), b = 18.910(5), c = 7.536(2) angstrom, V = 1618.7(11) angstrom(3), Z = 8, R = 0.073. © 2008, Oldenbourg Wissenschaftsverlag GmbH
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    A multi-domain gem-grade Brazilian apatite
    (De Gruyter, 2012-10-01) Baikie, T; Schreyer, MK; Wong, CL; Pramana, SS; Klooster, WT; Ferraris, C; McIntyre, GJ; White, TJ
    A gem-grade apatite from Brazil of general composition (Ca,Na)10[(P,Si,S)O4]6(F,Cl,OH)2 has been studied using single-crystal X-ray and neutron diffraction together with synchrotron powder X-ray diffraction. Earlier electron microscopy studies had shown the nominally single-phase apatite contains an abundant fluorapatite (F-Ap) host, together with chloro-hydroxylapatites (Cl/OH-Ap) guest phases that encapsulate hydroxylellestadite (OH-El) nanocrystals. While the latter features appear as small (200–400 nm) chemically distinct regions by transmission electron microscopy, and can be identified as separate phases by synchrotron powder X-ray diffraction, these could not be detected by single-crystal X-ray and neutron analysis. The observations using neutron, X-ray and electron probes are however consistent and complementary. After refinement in the space group P63/m the tunnel anions F− are fixed at z = ¼ along <001>, while the anions Cl− and OH− are disordered, with the suggestion that O-H•••O-H••• hydrogen-bonded chains form in localized regions, such that no net poling results. The major cations are located in the 4f AFO6 metaprism (Ca+Na), 6h ATO6X tunnel site (Ca only), and 6h BO4 tetrahedron (P+Si+S). The structural intricacy of this gem stone provides further evidence that apatite microstructures display a nano-phase separation that is generally unrecognized, with the implication that such complexity may impact upon the functionality of technological analogues. © 2012, Mineralogical Society of America.
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    The new quasi-laue diffractometer at the Australian OPAL Research Reactor
    (The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Klooster, WT
    The new single-crystal diffractometer for the Replacement Research Reactor in Australia will be a quasi-Laue diffractometer, similar to VIVALDI at ILL, France. It will be competitive with the best instruments currently available. Data collection times for a normal structure determination will be less than a day, a considerable improvement on current data collection times, typically a few weeks at HIFAR. Also, the crystal size needed for an experiment can as small as about 0.1 mm3, opening up new research areas where it has proved difficult to grow crystals sufficiently big (several mm3) which are currently needed. An area of research opening up will be multiple temperature and/or pressure measurements. More detailed information on the instrument will be presented. © The Author
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    The new quasi-laue diffractometer at the Australian OPAL Research Reactor
    (International Union of Crystallography, 2005-08-23) Klooster, WT
    The new single-crystal diffractometer for the Replacement Research Reactor in Australia will be a quasi-Laue diffractometer, similar to VIVALDI at ILL, France. It will be competitive with the best instruments currently available. Data collection times for a normal structure determination will be less than a day, a considerable improvement on current data collection times, typically a few weeks at HIFAR. Also, the crystal size needed for an experiment can as small as about 0.1 mm3, opening up new research areas where it has proved difficult to grow crystals sufficiently big (several mm3) which are currently needed. An area of research opening up will be multiple temperature and/or pressure measurements. More detailed information on the instrument will be presented.
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    X-ray and neutron diffraction studies of LiMn2O4 cathode materials
    (X-Ray Applications Malaysia Society, 2008-07) Kamarulzaman, N; Subban, RYH; Yusoff, RY; Shaari, NH; Aziz, NAA; Bustam, MA; Blagojevic, N; Elcombe, MM; Blackford, MG; Avdeev, M; Klooster, WT; Fun, HK
    No abstract available.