Thermodynamics kinetics of boron carbide under gamma irradiation dose

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dc.contributor.authorMirzayev, Matlab
dc.contributor.authorDemir, Ertugrul
dc.contributor.authorMammadov, Khagani
dc.contributor.authorMehdiyeva, Ravan
dc.contributor.authorJabarov, Sakin
dc.contributor.authorTugrul, A. Beril
dc.contributor.authorBiira, Saphina
dc.contributor.authorTiep, Nguyen
dc.contributor.authorThabethe, Thabsile
dc.date.accessioned2023-04-03T17:48:08Z
dc.date.available2023-04-03T17:48:08Z
dc.date.issued2019
dc.description.abstractIn 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 ow 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 200 h 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 rest 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.en_US
dc.identifier.citationMirzayev, M., Demir, E., Mammadov, K., Mehdiyeva, R., Jabarov, S., Tugrul, A. B., ... & Thabethe, T. (2019). Thermodynamics kinetics of boron carbide under gamma irradiation dose. International Journal of Modern Physics B, 33(09), 1950073. DOI: 10.1142/S0217979219500735en_US
dc.identifier.other10.1142/S0217979219500735
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/8401
dc.language.isoenen_US
dc.publisherInternational Journal of Modern Physics Ben_US
dc.subjectBoron carbideen_US
dc.subjectGamma irradiationen_US
dc.subjectThermodynamics kineticsen_US
dc.subjectHeat ow rateen_US
dc.subjectActivation energyen_US
dc.titleThermodynamics kinetics of boron carbide under gamma irradiation doseen_US
dc.typeArticleen_US
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