Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 16, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Development of a Small Scale Adiabatic Calorimeter (Room Temperature to 600°C) and Heat Capacity Measurement of Synthetic Cu3BiS3
    Tadato Mizota, Mideki E. Ishida, Hiroto Shin, Yuji Kusayanagi
    1989 Volume 16 Issue 4 Pages 165-172
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.165
    JOURNAL FREE ACCESS
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    A small scale adiabatic calorimeter usable for less than 2g of sample has been developed in order to measure heat capacity or heat of transition of materials which are difficult to obtain sufficiently in amount for the measurement. The central part and the adiabatic shield part are constracted as small as possible to decrease the total heat capacity of the calorimeter. Sheath thermocouples of 0.5mm outer diameter and sheath heaters were thus used for temperature measurement and for adiabatic control. A micro-computer system was used for the data acquisition and for setting working conditions. This system enables to measure heat capacities almost less than 1% in precision by using 1.8g of sample. Measurement examples are given for heat capacities of NBS-standard alumina and synthetic Cu3BiS3.
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  • Surface Reactivity and Characterization of Powders
    Tadao Ishii
    1989 Volume 16 Issue 4 Pages 173-184
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.173
    JOURNAL FREE ACCESS
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    The phase-boundary reaction that takes place in the near-surface of the powders plays an important role in the reactivity of fine powders. Surface reactivity of oxide powders in four solid-solid react8n systems, Fe2O3-ZnO, Al2O3-ZnO, BaCO3-TiO2 and Fe2O3-Al2O3, was investigated on the basis of the thermal characterization of the surface layer (< 50nm thick) of the constituent powders with different preparation histories by emanation thermal analysis (ETA) using 226Ra as parent isotope. ETA provided useful information on the phase-boundary processes taking place in the initial reaction step.
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  • Thermal Analyses of Thin Films
    Yutaka Sawada, Nobuyasu Mizutani
    1989 Volume 16 Issue 4 Pages 185-194
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.185
    JOURNAL FREE ACCESS
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    Thermal analyses of various films are reviewed. Drastic increase is observed for the number of reports on thermal analyses of films in recent years. Examples of DTA, DSC and TG of thin and thick films deposited on the substrates are reported. Thermomagnetometry, high-temperature resistivity measurement, dynamic reflectance spectroscopy, thermal desorption spectrum, thermal expansion measurement for the films on substrates are briefly introduced. Examples of DTA, DSC and TG of the substrate-free films and the raw materials for film deposition are reported. Importance of technological developments is stressed for thermal analyses of thin films.
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  • Design of Mesomorphic Benzene Derivatives
    Yoshio Matsunaga
    1989 Volume 16 Issue 4 Pages 195-205
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.195
    JOURNAL FREE ACCESS
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    It is generally believed that monomeric p-disubstituted benzenes are not mesogenic. However, studies on binary systems with nematogenic N-(4-propoxybenzylidene)-4-hexylaniline revealed that various p-disubstituted benzenes are potentially smectogenic. Employing NHCOCnH2n+1 or CONHCnH2n+1 group, which favors particularly the high transition temperatures to latent smectic phases, the author succeeded in designing discogenic or nematogenic benzene derivatives; e. g. N, N′-dialkanoyl-2-methyl- and 2, 4, 6-trimethyl-1, 3-benzenediamines, N, N′, N″-trialkyl-1, 3, 5-benzenetricarboxamides, N, N′-dialkanoyl-2, 5, 6-trimethyl-4-alkanoyloxy-1, 3-benzenediamines, N, N′-dialkanoyl-2, 4-bis (alkanoyloxy)-1, 3-benzenediamines, and N, N′-dialkanoyl-2, 3, 5, 6-tetrakis(alkanoyloxy)-1, 4-benzenediamines. Thus, the anisotropy of the intermolecular forces, which is the primary factor in the formation of liquid crystals, was shown to be achievable irrespective of molecular shape. Liquid crystals may be discotic if the rotation around the short axis perpendicular to the molecular plane is easier than that around the long axis in the plane.
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  • twenty fifth years of Japanese Conference on Calorimetry and Thermal Analysis
    1989 Volume 16 Issue 4 Pages 206-240
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.206
    JOURNAL FREE ACCESS
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  • Round-robin Test on Thermal Conductivity and Specific Heat Capacity Measurements of Ceramics by Frash Method
    T. Mitsuhashi
    1989 Volume 16 Issue 4 Pages 241-243
    Published: October 30, 1989
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.16.241
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