Open AccessEff ects of Cr Doping on Physical Properties of CuBO2 Delafossite Oxide
Author(s) -
Sornamol Traiphop,
Jedsada Manyam,
Teerasak Kamwanna
Publication year - 2022
Publication title -
warasan khana witthayasat maha witthayalai chiang mai
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.164
H-Index - 20
ISSN - 0125-2526
DOI - 10.12982/cmjs.2022.018
Subject(s) - delafossite , materials science , analytical chemistry (journal) , dielectric , band gap , scanning electron microscope , paramagnetism , ferromagnetism , doping , magnetization , condensed matter physics , oxide , chemistry , magnetic field , metallurgy , optoelectronics , physics , chromatography , quantum mechanics , composite material
In this research work, CuB1−xCrxO2 (x = 0.00, 0.01, 0.03, 0.05, and 0.07) were synthesized by using a conventional solid-state reaction method. The effects of Cr concentration on its microstructure, optical, magnetic, and dielectric properties were investigated. X-ray diffraction (XRD) results revealed the crystal structure of all samples belongs to the R-3m delafossite structure. Besides, a second phase CuCrO2 appeared in a high Cr content sample. Scanning electron microscope (SEM) indicated that particle size of samples was about 300 nm and slightly increased with increasing the Cr content. The optical properties measured by UV-visible spectroscopy showed the absorbance peak at ~250 nm. The corresponding direct optical band gap was about 2.90 eV. The magnetic hysteresis curve measurements of all samples revealed the paramagnetic behavior at room temperature. Noticeably, the Cr-doped samples (x = 0.01−0.07) exhibited as a ferromagnetic behavior at 50 K. Furthermore, the zero-fi eld-cooling magnetization of the Cr-doped samples shows a ferromagnetic transition temperature at ~130K. Finally, the dielectric measurement of all samples shows the colossal dielectric permittivity.