Document Details Document Type : Article In Journal  Document Title : Thermal decomposition kinetics of strontium oxalate Thermal decomposition kinetics of strontium oxalate   Subject : Chemistry  Document Language : English  Abstract : The thermal decomposition behavior in air of SrC2O4 • 1.25H2O was studied up to the formation of SrO using DTA-TG-DTG techniques. The decomposition proceeds through four well-defined steps. The first two steps are attributed to the dehydration of the salt, while the third and fourth ones are assigned to the decomposition of the anhydrous strontium oxalate into SrCO3 and the decomposition of SrCO 3 to SrO, respectively. The exothermic DTA peak found at around 300°C is ascribed to the recrystallization of the anhydrous strontium oxalate. On the other hand, the endothermic DTA peak observed at 910°C can be attributed to the transition of orthorhombic-hexagonal phase of SrCO 3. The kinetics of the thermal decomposition of anhydrous strontium oxalate and strontium carbonate, which are formed as stable intermediates, have been studied using non-isothermal TG technique. Analysis of kinetic data was carried out assuming various solid-state reaction models and applying three different computational methods. The data analysis according to the composite method showed that the anhydrous oxalate decomposition is best described by the two-dimensional diffusion-controlled mechanism (D2), while the decomposition of strontium carbonate is best fitted by means of the three-dimensional phase boundary-controlled mechanism (R3). The values of activation parameters obtained using different methods were compared and discussed.  ISSN : 0366-6352  Journal Name : Chemical Papers  Volume : 61  Issue Number : 5  Publishing Year : 1428 AH 2007 AD  Article Type : Article  Added Date : Monday, December 19, 2011  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email فوزية محمد النويصر Al-Nowaiser, Fawziya M Researcher Doctorate falnowaiser@kau.edu.sa شعيل أحمد الثبيتي AL-Thabaitia, Shaeel Ahmed Researcher Doctorate sthabiti@hotmail.com عبدالرحمن عبيد اليوبي Al-Youbia, Abdulrahman Obaid Researcher Doctorate aalyoubi@kau.edu.sa عبدالله يوسف عبيد Obaid, Abdullah Yousif Researcher Doctorate aobaid@kau.edu.sa M A Gabal Gabal, M A Researcher Doctorate mgabalabdo@yahoo.com Files File Name Type Description  31700.pdf pdf Abstract Back To Researches Page