Derivatographic studies on dehydration of salt hydrates and their deuterium oxide analogues. V

• Published in: Thermochimica acta 1975-09, Vol.13 (1), p.71-83
• Main Authors: Ray Chaudhuri, N., Pathak, G.K.
• Format: Article
• Language: English
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/0040-6031(75)80066-9

Non-isothermal thermal studies of the dehydration of the double salt hydrates of the type M(I) 2SO 4·M(II)SO 4·6H 2O and their D 2O analogues were carried out where M(I) = TI(I) and M(II) = Mg(II), Co(II), Ni(II), Cu(II) or Zn(II). Thermal parameters like activation energy, order of reaction, enthalpy change, etc. were evaluated from the analysis of TG, DTA and DTG curves. These thermal parameters were compared with those of other series, like NH 4(I), K(I), Rb(I) and Cs(I) studied earlier. On deuteration the nature of dehydration altered in the case of Tl 2Zn(SO 4) 2·6H 2O only. The thermal stability of the salt hyd discussed in relation to the salt hydrates of other series. The role of divalent cation on the thermal properties of dehydration of salt hydrates is also discussed. The order of reaction was always found unity. The values of Δ H were within ≈12–≈16 kcal mol −1.