Application of Valence-to-core X-ray Emission Spectroscopy for Identification and Estimation of Amount of Carbon Covalently Bonded to Chromium in Amorphous  Cr-C Coatings Prepared by Magnetron Sputtering

Safonov, V.A.; Habazaki, H.; Glatzel, P.; Fishgoit, L.A.; Drozhzhin, O.A.; Lafuerza, S.; Safonova, O.V.

Авторы: Safonov V.A., Habazaki H., Glatzel P., Fishgoit L.A., Drozhzhin O.A., Lafuerza S., Safonova O.V.
Журнал: Applied Surface Science
Том: 427
Год издания: 2018
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 566
Последняя страница: 572
DOI: 10.1016/j.apsusc.2017.08.219
Аннотация: Cr-C coatings containing different amount of carbon ranging from ~5 to 50 at. % were prepared by the direct current (DC) magnetron sputtering on a polished substrate of polycrystalline silicon. The thickness of the samples was about 400 nm. We characterized the composition and the structure of the as-received coatings and those annealed at 500oC by X-ray diffraction (XRD), Energy dispersion X-ray spectroscopy (EDX) and valence-to-core X-ray emission spectroscopy (vtc-XES) methods. As follows from XRD measurements, the samples with the carbon content above 35 at. % do not demonstrate any sign of the long-range order and annealing at 500оС does not change their crystallinity. The vtc-XES curves of the as-prepared and annealed samples can be fitted as a superposition of corresponding spectra of chromium metal and chromium carbide (Cr3C2) phases. After the annealing, the content of carbides in the samples (and, correspondingly, the content of covalently bound carbon) somewhat increases. This suggests that the as-received coatings contain a certain amount of carbon that is not covalently bonded to chromium (most likely, elemental carbon) and their annealing at 500оС transforms this carbon into the additional (of the order of 2–5 at. %) amount of chromium carbide compounds. It deserves mentioning that for Cr-C coatings prepared by the electrochemical deposition from Cr(III) electrolytes containing organic compounds we have not observed changes in the vtc-X-ray emission spectra after similar annealing. This suggests that electrochemical deposition method in contrast to magnetron sputtering technique even at low temperatures favors the formation of only covalently bounded carbon.
Добавил в систему: Сафонов Виктор Алексеевич

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ЦЭМИ РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ЦЭМИ РАН

Application of Valence-to-core X-ray Emission Spectroscopy for Identification and Estimation of Amount of Carbon Covalently Bonded to Chromium in Amorphous Cr-C Coatings Prepared by Magnetron Sputteringстатья Исследовательская статья

Прикрепленные файлы