Browsing by Author "Ohno, Hideo"

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    Structural Analysis of Some Molten Materials by X-ray Diffraction Part 5.—LiCl, PbCL and their Mixtures
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (07), 1978) Ohno, Hideo; Yoroki, Mitsugu; Furukawa, Kazuo; Takagi, Yoshiki; Nakamura, Tetsuro
    The molten structure of PbCl2, LiCl and their mixtures were examined by X-ray diffraction analysis. In molten Pbcl2, each Pb atom is surrounded by about eight Cl atoms at a distance of 2.92 Å, which is near to the sum of the ionic radii of Pb2+ and Cl–. It is expected that only very few rigid complex anions will be present in molten PbCl2. The results of X-ray diffraction analysis in molten PbCl2 are consistent with those of Raman spectroscopy. The average Pb–Pb interaction in the molten state should be intermediate between a b.c.c. and an s.c. arrangement and the s.c. arrangement takes precedence with increasing LiCl concentration.
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    Structural Analysis of Some Molten Materials by X-ray Diffraction: Part 2.—Li2SO4, Na2SO4 and the Mixed System
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (04), 1978) Ohno, Hideo; Furukawa, Kazuo
    The structures of molten Li2SO4, Na2SO4 and their mixtures have been examined by co nsideration of the radial distribution function and the molar volume. The existence of tetrahedral su phate ions in these molten salts has been demonstrated. S—O and O—O distances for the sulphate ion in the molten state arc 1.50o and 2.450 A, respectively. A close packed arrangement of sulphate ions appears to be the configuration realized in molten Li2SO4 ; the calculated correlation function based on this structural model is qualitatively in good agreement with the observed one. In molten Na2SO4, sodium ions probably occupy a position intermediate between the edge and face sites of the sulphate ion; the nearest-neighbour distances of Na—S and Na—O pairs are 2.8 and 2.33 A, respectively.
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    Structural Analysis of Some Molten Materials by X-ray Diffraction: Part 3.—MnCl2
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (04), 1978) Ohno, Hideo; Furukawa, Kazuo; Tanemoto, Kei; Tagaki, Yoshiki; Nakamura, Tetsuro
    The structure of molten MnCl2 has been examined by consideration of the radial distribution function. The nearest Mn-Cl distance is 2.51 A and the coordination number of manganese is 4.0. An f.c.c. structural model with loosely distributed Cl atoms was proposed on the basis of tetrahedral coordination of Cl atoms around each Mn atom.
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    Structural Analysis of Some Molten Materials by X-ray Diffraction: Part 4.—Alkali Nitrates RNO3(R = Li, Na, K, Rb, Cs and Ag)
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (02), 1978) Ohno, Hideo; Furukawa, Kazuo
    The structures of molten LiNO3, NaNO3, KNOj, RbNO3, CsNO3 and AgNO3 have been investigated by deriving the radial distribution function from X-ray diffraction data. The existence of NO J ions in these molten salts was confirmed by analysis of the first peaks of the radial distribution functions. Nitrate ions and cations could have a diamond (or zinc blende)-like arrangement with 25 % random vacancies in molten NaNO3, KNO3, RbNO3 and CsNO3. On the other hand, nitrate ions and cations could have a simple cubic (or NaCl)-likc arrangement in molten AgNO3 and LiNO3.