Non-isothermal studies of the dehydration of double salt hydrates and their deuterium oxide analogues. I.

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Non-isothermal studies of the dehydration of double salt hydrates of the type (NH4)2AB4·M(II)SO4·6H2O and their D2O analogues in solid state were carried out with a derivatograph, where AB4=BeF42− or SeO42−, M(II)=Mg(II), Mn(II), Co(II), Ni(II), Cu(II), or Zn(II). These salt hydrate molecules lost water/heavy water in single or multiple steps upon heating. Intermediate hydrates were isolated and characterised by elemental analysis and IR spectral measurements. The activation energy for each step of dehydration of the salt hydrate was evaluated from the analysis of TG, DTG, and DTA curves of the respective derivatograms. Enthalpy change was evaluated from the DTA peak area and the order of reaction was found to be unity for each step of dehydration. The nature of dehydration was little affected by deuteration. Thermal parameters for the (NH4)2AB4·M(II)SO4·6H2O and their D2O analogues were compared with the salt hydrates, K2AB4·M(II)SO4·6H2O, (NH4)2SO4·M(II)SO4·6H2O and their D2O analogues.
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