Dehydration of un-irradiated and gamma and electron-beam irradiated europium acetate hydrate under non-isothermal conditions: kinetics of the dehydration process of un-irradiated material

被引：0
作者：
Saleh, Noura Mossaed [1 ]
Aly, Hisham Fouad [2 ]
Mahmoud Ahmed, Eman Abdelrahman [3 ]
Mahfouz, Refaat Mohamed [1 ]
机构：
[1] Assiut Univ, Fac Sci, Chem Dept, Assiut 71516, Egypt
[2] Egyptian Atom Energy Author, Cairo, Egypt
[3] Egyptian Petr Res Inst, Cairo, Egypt
来源：
RADIOCHIMICA ACTA | 2025年 / 113卷 / 03期
关键词：
gamma irradiation; electron beam irradiation; non-isothermal dehydration; isoconversional approach; europium acetate hydrate; THERMAL-DECOMPOSITION; MODEL-FREE; APPROXIMATE FORMULA; ACTIVATION-ENERGY; COMPUTATIONS; PARAMETERS; PYROLYSIS; SPECTRA;
D O I：
10.1515/ract-2024-0317
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The authors present here the decomposition of un-irradiated (pristine) as well as of gamma (gamma) and electron beam (EB) irradiated samples of europium (III) acetate hydrate (EuAc.xH2O) in the temperature range of 25-900 degrees C in the air atmosphere. Two absorbed doses of 103 (gamma-ray) and 102 kGy (EB) were examined. The profiles of the TG curves of the dehydration process display noticeable changes in induction periods and mass loss percentages by exposure to irradiation. The kinetics of the dehydration process were analyzed using both model-fitting and model-free approaches. The dehydration process was controlled by the phase boundary model (R2). The E a -alpha plots indicate that the dehydration is not a complex process and follows one reaction mechanism. Powder X-ray diffraction displayed that europium acetate hydrate crystallizes in a monoclinic system (SG P2/m), and no phase transformation was detected by two sources of irradiation up to 103 (gamma-ray) and 102 kGy (EB). Thermodynamic parameters of the dehydration process were calculated and assessed. A predicted thermogram (TG) of the isothermal dehydration of EuAc.xH2O was constructed from non-isothermal data and used to determine the reaction model and the kinetic parameters of the dehydration process.
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页码：229 / 243
页数：15
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