塩基性炭酸マグネシウムのDTA曲線における発熱過程について Studies on the Exothermic Processes in the Thermal Decomposition of Basic Magnesium Carbonate

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The exothermic reaction observed in the thermal decomposition of basic magnesium carbonate was studied by DTA and X-ray.<br>The DTA taken in air and CO<sub>2</sub> shows occasionally a very sharp exothermic peak at about 500°C in addition to the rather broad endothermic ones.<br>The relative heights of the exothermic peaks depend on the experimental conditions such as the amounts of the samples, the atmosphere (air or CO<sub>2</sub>) and the amounts or kinds of the additives (alkali or alkaline earth halides), among the examined additives magnesium chloride showed a remarkable effect.<br>From these results of the analyses the decomposition process could be explained as follows. The crystalization of MgO proceeds slowly through amorphous state corresponding to the first endothermic peak up to above the exothermic peak. At 500°C, MgCO<sub>3</sub> is formed suddenly and the amounts of MgCO<sub>3</sub> are nearly proportional to the heights of the exothermic peaks emerged at this temperature. From above this temperature, however, MgCO<sub>3</sub> decomposes immediately into MgO.<br>The mechanism of these processes under various conditions are shortly discussed.

収録刊行物

  • 窯業協會誌

    窯業協會誌 84(970), 259-264, 1976-06-01

    公益社団法人日本セラミックス協会

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110002315702
  • NII書誌ID(NCID)
    AN00245650
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    18842127
  • NDL 記事登録ID
    1717675
  • NDL 刊行物分類
    PA45(無機化学・無機化学工業--セラミックス)
  • NDL 雑誌分類
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL 請求記号
    Z17-249
  • データ提供元
    CJP引用  NDL  NII-ELS  J-STAGE 
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