Kumar, Shalendra Alimuddin Kumar, Ravi Thakur, P. Chae, K. H. Angadi, Basavaraj Choi, Wk 2024-01-21T00:04:54Z 2024-01-21T00:04:54Z 2021-09-02 2007-11-28 0953-8984 https://pubs.kist.re.kr/handle/201004/133970 We present structural, electrical transport, magnetic, and electronic structure studies of Mg(0.95)Mn(0.05)Fe(2-2)xTi(2x)O(4) ferrite using x-ray diffraction, dielectric spectroscopy, DC magnetization and near edge x-ray absorption fine structure (NEXAFS) measurements. The x-ray diffraction study shows a structural transition from cubic to tetragonal with Ti substitution. The dielectric constant and DC conductivity increase with Ti substitution up to x = 0.2. However, with further increase of substitution both the dielectric constant and DC conductivity decrease. This electrical behavior indicates that at low values of substitution, hopping between Fe3+ and Fe2+ increases whereas at higher concentrations the total content of Fe ions decreases. It is observed that all the samples exhibit ferrimagnetic behavior at 300 K and the saturationmagnetization decreases with increase in Ti substitution. The NEXAFS measurements have been carried out at O K-, Fe L-, Fe K-, and Ti L- edges to investigate the chemical states and the electronic structure of the Mg0.95Mn0.05Fe2-2xTi2xO4 ( 0 <= x <= 0.5) system at room temperature. The O K- edge spectra indicate that the Fe 3d orbitals are considerably modified with the substitution of Ti ions. At x >= 0.3, a new spectral feature appears ( similar to 532 eV) due to the transitions from oxygen 2p to Ti 3d orbitals which starts dominating the pre-edge spectra of the system. Both Fe L-3,L-2- and Fe K-edge spectra indicate that iron Fe3+ ions convert into Fe2+ with the substitution of Ti ions. The Ti L-3,L-2- edge NEXAFS spectra reveal that the Ti remains in the 4+ state for all the samples. The observed experimental results have been explained on the basis of dilution of the magnetic sublattice by Ti substitution, which provides a strong interplay between electrical and magnetic properties along with their electronic structure. English IOP PUBLISHING LTD DIELECTRIC BEHAVIOR ZN FERRITES MOSSBAUER CONDUCTIVITY TEMPERATURE TRANSITION GLASS Electrical transport, magnetic, and electronic structure studies of Mg(0.95)Mn(0.05)Fe(2-2x)Ti2xO4 +/-delta (0 <= x <= 0.5) ferrites Article 10.1088/0953-8984/19/47/476210 1 JOURNAL OF PHYSICS-CONDENSED MATTER, v.19, no.47 JOURNAL OF PHYSICS-CONDENSED MATTER 19 47 scie scopus 000250711200013 2-s2.0-36048961790 Physics, Condensed Matter Physics Article DIELECTRIC BEHAVIOR ZN FERRITES MOSSBAUER CONDUCTIVITY TEMPERATURE TRANSITION GLASS electronic structure NEXAFS Ferrite