TY - JOUR ID - 125560 TI - Cr2O3 Nanoparticles: Synthesis, Characterization, and Magnetic Properties JO - Nanochemistry Research JA - NCR LA - en SN - 2538-4279 AU - Dehno Khalaji, َaliakbar AD - Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran Y1 - 2020 PY - 2020 VL - 5 IS - 2 SP - 148 EP - 153 KW - Cr2O3 Nanoparticles KW - Thermal decomposition KW - Ferromagnetic KW - Paramagnetic DO - 10.22036/ncr.2020.02.005 N2 - In this paper, semi-solid precursor of chromium was prepared from the reaction of Cr(NO3)3 and oxalic acid at the presence of NaOH. Then, Cr2O3 nanoparticles were prepared by solid-state thermal decomposition of this precursor at 500 and 600 ºC at standard atmospheric pressure for 3 h. The as-prepared Cr2O3 nanoparticles were characterized by Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis) spectroscopy, X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The sharp vibration bands in FT-IR spectra and high intensity peaks in XRD patterns confirmed the preparation of pure, single rhombohedral phase and crystalline Eskolaite structure of Cr2O3 nanoparticles. A broad absorption peak appeared at UV-Vis spectra indicates the d3 electronic transition of Cr3+. The TEM images show that the particles are similar and a little agglomerated with the average crystal size of < 100 nm. The VSM results predict that the as-prepared Cr2O3 nanoparticles are weak ferromagnetic and paramagnetic. UR - http://www.nanochemres.org/article_125560.html L1 - http://www.nanochemres.org/article_125560_c66ac8d2667886ea7e57a10cb9040fb7.pdf ER -