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Please use this identifier to cite or link to this item: https://elib.bsu.by/handle/123456789/233887
Title: Влияние флюенса ускоренных электронов на парамагнитные свойства НРНТ алмазов
Other Titles: Effect of Fluence of Accelerated Electrons on Paramagnetic Properties of NRNT Diamonds / Igor Azarko, Igor Karpovich, Oleg Ignatenko, Alexandra Konovalova, Stanislav Lastovsky, Valery Komar
Authors: Азарко, И. И.
Карпович, И. А.
Игнатенко, О. В.
Коновалова, А. В.
Ластовский, С. Б.
Комар, В. А.
Issue Date: 2019
Publisher: Минск : БГУ
Citation: Взаимодействие излучений с твердым телом = Interaction of Radiation with Solids : материалы 13-й Междунар. конф., Минск, Беларусь, 30 сент. – 3 окт. 2019 г. / редкол.: В. В. Углов (отв. ред.) [и др.]. – Минск : БГУ, 2019. – С. 126-129.
Abstract: Изучено влияние величины флюенса ускоренных электронов с энергией 6 МэВ на парамагнитные свойства кристаллов алмаза, синтезированных методом НРНТ в системах Fe-Ni–С и Fe-Al-С при температуре 1600 ˚С и давлении 5 ГПа в течение 85 часов. Установлено, что для алмазов типа Ib характерно резкое увеличение интенсивности сигнала С-дефекта при флюенсе 3∙10 18 эл/см 2 , а также изменение мощности насыщения для центральной компоненты сигнала. Для облученных образцов типа Ia регистрировалась лишь центральная компонента сигнала ЭПР с g=2.0024, интенсивность которой увеличивается с ростом флюенса ускоренных электронов, что может быть связано с генерацией радиационных дефектов.
Abstract (in another language): The diamond single crystals (10 samples) synthesized by the method of high pressures and high temperatures in the region of the thermodynamic stability of diamond (temperature 1600 °C and pressure 5 GPa) by gradual recrystallization of carbon dissolved in the molten metal were investigated. Diamonds were synthesized for 85 hours in two growth systems: Fe – Ni – C and Fe – Al – C. As a result, yellow (type Ib) and colorless (type Ia) crystals were obtained. The samples were investigated by the method of electron paramagnetic resonance. The concentration of paramagnetic centers was determined from the EPR spectra. Registration was carried out in phase with modulation of the magnetic field at room temperature and microwave power values of 0.01, 0.2, 1, 5, and 15 mW, orientation of the external magnetic field H0∥ <100>. For all crystals type Ib, paramagnetic signals from C defect and exchange-coupled nitrogen atoms were recorded, which indicates a high concentration of nitrogen atoms in the samples (5∙10 17 - 5∙10 19 cm -3 ). For diamonds of type Ia, the EPR signal was not recorded. Then, the samples were irradiated with accelerated electrons with an energy of 6 MeV in three stages: with a fluence of 3∙10 17 el/cm 2 , 9∙10 17 el/cm 2 and 3∙10 18 el/cm 2 . As a result, the yellow diamonds changed color to green, and colorless diamonds turned greenish blue. It was found that for diamonds from type Ib, a sharp increase in the intensity of the signal from the C-defect was observed at a fluence of 3∙10 18 el/cm 2 , as well as a change in the saturation power for the central signal component. For irradiated samples of type Ia, only the central component of the EPR signal with g = 2.0024 was recorded, the intensity of which increases with increasing fluence of accelerated electrons, which may be due to the generation of radiation defects.
Description: Секция 2. Радиационные эффекты в твердом теле = Section 2. Radiation Effects in Solids
URI: http://elib.bsu.by/handle/123456789/233887
ISSN: 2663-9939
Appears in Collections:2019. Взаимодействие излучений с твердым телом = Interaction of Radiation with Solids

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