Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 24, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Heat Capacity and Thermodynamic Functions of Anhydrous 4, 4′-Bipyridine
    Yasuhisa Yamamura, Kazuya Saito, Isao Ikemoto
    1997 Volume 24 Issue 2 Pages 57-60
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.57
    JOURNAL FREE ACCESS
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    Heat capacity of anhydrous 4, 4′-bipyridine was measured by adiabatic calorimetry between 10 and 300K. Thermodynamic functions are tabulated.
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  • Experimental Phase Equilibria in the Sr-Ca-Cu-O System Under Reduced Oxygen Atmosphere
    Ryosuke O. Suzuki, Takamichi Ogawa, Daniel Risold, Ludwig J. Gauckler, ...
    1997 Volume 24 Issue 2 Pages 61-68
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.61
    JOURNAL FREE ACCESS
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    Phase equilibria were studied in the Sr-Ca-Cu-O system by annealing samples at 1153K in Ar-O2 gas mixtures. The stability ranges of the oxide solid solutions were observed by X-ray diffraction measurements especially at 4 compositions in 12 gas mixtures. 4 sets of invariant 4-phase equilibrium and their oxygen partial pressure, PO2, were deduced from the surrounding 3-phase equilibria. The compositions of the related phases were evaluated by combining EDX analysis and the sample compositions. These results are compared with equilibrium calculations based on thermodynamic modelling.
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  • Resonance and Strain Energies in Non-planar Cyclic Conjugate Molecules by Combustion Calorimetry
    Tetsu Kiyobayashi, Minoru Sakiyama, Kagetoshi Yamamoto
    1997 Volume 24 Issue 2 Pages 69-78
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.69
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    Resonance and strain energies in non-planar cyclic conjugate molecules, such as C60 and corannulene, are discussed quantitatively based on combustion calorimetric measurement. Energetics of planar aromatic molecules are reasoned in order to provide reference energies. The energetics is extended to the non-planar sp2 carbon networks. The formation enthalpies of graphite fragment, fullerenes and fullerene onions are predicted as functions of the number of carbon atoms.
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  • Hydration Heat of Zeolites, and Application for Heat Storage and Heat Pump
    Tadato Mizota
    1997 Volume 24 Issue 2 Pages 79-89
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.79
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    Researches on hydration/dehydration calorimetry of zeolites and on zeolite heat pump systems have been reviewed. Hydration heat of zeolites can be used for heat exchange in a heat pump system without any fuels or electricity. Reversible heat exchange or heat storage of the zeolite/water system have been tested extensively so as to use zeolites as heat exchange absorbents and water as an absorbate. The simple but physicochemically unique combination of zeolite and water of the system is attractive for environmental safety, and for effective use of low temperature heat sources such as solar energy and waste heat from factories. However, hydration mechanisms of zeolitic water are so complicated that some confusions are found even in basic researches which are thus necessary to explore optimum zeolites suitable for the heat pump system.
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  • Phase Transition Mechanisms of BEDT-TTF Radical Ion Salts
    Akira Miyazaki, Toshiaki Enoki
    1997 Volume 24 Issue 2 Pages 90-100
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.90
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    The metal-insulator phase-transition mechanisms of the radical ion salts based on the organic donor BEDT-TTF are discussed, on the basis of the crystal structure and physical property measurements. In the case of (BEDT-TTF)3(ClO4)2, the thermal rotation of the anions in the crystal plays an important role in the emergence of the second-order structural phase transition at 171K, whereas the isomorphous (BEDT-TTF)3(HSO4)2 shows the first-order Mott-type transition at 126K and the structural transition is surpressed, as the consequence of the prohibition of the anion rotation by the hydrogen bonds between the anions. For the case of solvent containing salts, (BEDT-TTF)2X·TCE0.5 (X=ClO4, BF4; TCE=1, 1, 2-trichloroethane), the emergence of the structural phase transition at 25K (ClO4 salt) and 60K (BF4 salt) is strongly related to the cooling rate around 150-200K, at which the growth of the superstructure is observed. The low-temperature X-ray structure analysis reveals that the origin of this superstructure for the BF4 salt is the partial freezing of the thermally puckered dihydrodithiin rings attached to the TTF skeletons of the donor molecules.
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  • phlogiston
    1997 Volume 24 Issue 2 Pages 101-102
    Published: April 30, 1997
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.24.101
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