Journal of thermal analysis

, Volume 46, Issue 5, pp 1487–1500 | Cite as

Thermal dehydration and decomposition of FeCl3·xH2O

  • S. B. Kanungo
  • S. K. Mishra


Thermal dehydration and decomposition characteristics of Fe(III) chloride hydrate have been studied by both isothermal and non-isothermal methods. After the initial melting at 35–40°C both dehydration and decomposition of the salt proceed simultaneously at temperature above 100°C. At 250–300°C a stable hydrated Fe(OH)2Cl is formed representing the first plateau region in the TG curve. Around 400°C, a second plateau is observed corresponding to the formation of mostly Fe2O3 which however retains some OH groups and Cl ions. However, these temperature ranges vary with the TA equipments used. Chemical analysis of the products of decomposition at temperatures above 140°C also gives evidence for the formation of FeOCl which on hydrolysis in water gives FeCl3 in solution. The FT-IR spectra suggest the presence of structural OH groups even for samples calcined at 300–400°C. The XRD patterns of the products of decomposition in the temperature range 160–400°C indicate the presence of β-FeOOH, some unidentified basic chlorides and α-Fe2O3.


decomposition dehydration Fe(III) chloride hydrate 


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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • S. B. Kanungo
    • 1
  • S. K. Mishra
    • 1
  1. 1.Regional Research LaboratoryBhubaneswar 751013 OrissaIndia

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