27 مهر 1398
ولي دلوجي

ولی دلوجی

مرتبه علمی: دانشیار
نشانی:
تحصیلات: دکترای تخصصی / فیزیک حالت جامد
تلفن: 0813339841
دانشکده: علوم پایه

مشخصات پژوهش

عنوان
Study of electric susceptibility, electrical resistivity and energy loss functions of carbon–nickel composite films at different annealing temperatures
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
amorphous carbon matrix, optical properties, electrical properties
سال
2015
مجله Physica Scripta
پژوهشگران ولی دلوجی

چکیده

In this work, the optical and electrical properties of carbon–nickel films annealed at different temperatures (300–1000 °C) were investigated. The obtained data of the refractive index n using the Swanepoel’s method can be analyzed to obtain the high-frequency dielectric constant which describes the free carriers and the lattice vibration modes of dispersion. The lattice dielectric constant εL and the plasma frequency ωp at 500 °C have maximum values 4.95 and 40.02×106 Hz, respectively. The free carrier electric susceptibility measurements in wavelength range (300–1000 nm) are discussed according to the Spitzer–Fan model. It is shown that the electric susceptibility at 500 °C has maximum value and with increasing wavelength it increases. It is also shown that the waste of electrical energy as heat at 500 °C has maximum value and with increasing wavelength it increases. It is found that energy loss by the free charge carriers when traversing the bulk and surface of films at 800 °C has a minimum value and it is approximately constant with wavelength. It is shown that optical properties were consistent with electrical properties of films annealed at different temperatures in temperature range (15–500 K).