03 خرداد 1403
نادر قبادي

نادر قبادی

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

مشخصات پژوهش

عنوان
Effect of Ni Substitution on Optical Transitions and Magnetic Behavior of Mesoporous NixCo3xO4 (0 £ x £ 1) Thin Films Prepared by Electrophoretic Deposition
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Nickel cobaltite, hydrothermal method, electrophoretic deposition (EPD), optical transition
سال
2020
مجله Journal of Electronic Materials
پژوهشگران نادر قبادی

چکیده

High-quality nickel cobaltite (NixCo3xO4, 0 £ x £ 1) nanopowders with various nickel contents have been prepared by a facile hydrothermal method, calcined in air at 300C for 2 h, then coated on the surface of indium tin oxide sheets by electrophoretic deposition. The optical, microstructural, and magnetic properties were characterized by x-ray diffraction (XRD) analysis, ultraviolet–visible (UV–Vis) spectrophotometry, field emission-scanning electron microscopy (FE-SEM), and vibrating-sample magnetometry. The XRD patterns of the pure and Ni-doped Co3O4 powders revealed the formation of single-phase spinel structure, without any impurity phases for all samples. The position and intensity of various absorption bands in the UV–Vis spectra were influenced by the distribution of Co2+ and Ni2+ ions at tetrahedral sites of the spinel structure, revealing that O2 fi Co2+ and O2 fi Ni2+ transition sites were affected by increasing the Ni2+ content, thereby changing the optical properties of NixCo3xO4. Vibrating-sample magnetometry analysis revealed that the magnetic nature of the prepared nanopowders changed from anti-ferromagnetic to very weak ferrimagnetic.