Thermodynamics kinetics of boron carbide under gamma irradiation dose.

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dc.contributor.author Mirzayev, Matlab
dc.contributor.author Demir, Ertugrul
dc.contributor.author Mammadov, Khagani
dc.contributor.author Mehdiyeva, Ravan
dc.contributor.author Jabarov, Sakin
dc.contributor.author Tugru, A. Beril
dc.contributor.author Biira, Saphina
dc.contributor.author Tiep, Nguyen
dc.contributor.author Thabethe, Thabsile
dc.date.accessioned 2021-09-29T06:50:38Z
dc.date.available 2021-09-29T06:50:38Z
dc.date.issued 2019-04-11
dc.identifier.citation Mirzayev, M. . . . [et al.]. (2019). Thermodynamics kinetics of boron carbide under gamma irradiation dose. International Journal of Modern Physics B, Vol. 33, No. 9 (2019) 1950073 (10 pages). DOI: 10.1142/S0217979219500735 en_US
dc.identifier.uri https://doi.org/10.60682/qs2m-nv86
dc.description Article en_US
dc.description.abstract In this paper, high purity boron carbide samples were irradiated by 60Co gamma radioisotope source (0.27 Gy/s dose rate) with 50, 100, 150 and 200 irradiation hours at room-temperature. The unirradiated and irradiated boron carbide samples were heated from 30◦C to 1000◦C at a heating rate of 5◦C/min under the argon gas atmosphere of flow rate 20 ml/min. Thermogravimetric (TG) and Differential Scanning Calorimetry (DSC) were carried out in order to understand the thermodynamic kinetics of boron carbide samples. The weight kinetics, activation energy and specific heat capacity of the unirradiated and irradiated boron carbide samples were examined in two parts, T ≤ 650◦C and T ≥ 650◦C, according to the temperature. The dynamic of quantitative changes in both ranges is different depending on the irradiation time. While the phase transition of unirradiated boron carbide samples occurs at 902◦C, this value shifts upto 940◦C in irradiated samples depending on the irradiation time. The activation energy of the unirradiated boron carbide samples decreased from 214 to 46 J/mol in the result of 200h gamma irradiation. The reduction of the activation energy after the irradiation compared to the initial state shows that the dielectric properties of the irradiated boron carbide samples have been improved. After the gamma irradiation, two energy barrier states depending on the absorption dose of samples were formed in the irradiated samples. The first and second energy barriers occurred in 0.56–0.80 and 0.23–0.36 eV energy intervals, respectively. The existence of two energy levels in the irradiated boron carbide indicates that the point defects are at deep levels, close to the valence band. Keywords: Boron carbide; gamma irradiation; thermodynamics kinetics; heat flow rate; activation energy. en_US
dc.description.sponsorship Busitema University, University of Pretoria. en_US
dc.language.iso en en_US
dc.publisher Busitema University ; World Scientific publishing en_US
dc.subject Boron carbide en_US
dc.subject Gamma irradiation en_US
dc.subject Thermodynamics kinetics en_US
dc.subject Heat flow rate en_US
dc.subject Activation energy en_US
dc.title Thermodynamics kinetics of boron carbide under gamma irradiation dose. en_US
dc.type Article en_US


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