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The promotive transformation for III →V phase in Na2SO4 crystals due to the sorption of water vapor was studied under various relative humidities at 25°C. In addition, the effect of a foreign sulfate (Eu2(SO4)3, Y2(SO4)3, SrSO4, T12SO4 or Cs2SO4) on the transformation was investigated under 90% relative humidity at 25°C. The relationship between the fraction of 111IT tiansition and the logarithm of the reaction time was elucidated by the three regions: ( i ) the starting step of the transition with formation of the sorption layer of water vapor on the crystals, (ii) the step of rapid progress of the transition caused by the presence of the saturated sorption layer near the crystal surface, (iii) the final step in which the transition proceeded sluggishly. The promotive action in the III, V transition due to the sorption of water vapor was remarkably inhibited by blending Eu2(SO4)3 or Y2(SO4)3, while the action was accelerated by blending Tl2SO4 or Cs2SO4. The effect of the foreign sulfate on the promotive action was discussed as follows: ( i ) the inhibitive effect on the action was resulted from the formation of a solid solution between Na2SO4 and the foreign sulfate, (ii) the accelerative effect on the action was resulted from the epitaxialcy due to the segregation of T12SO4 or Cs2SO4crystal on the grain boundary in Na2SO4 crystals.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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