Kumar, Hemaunt Singh, Jitendra Pal Srivastava, R. C. Negi, P. Agrawal, H. M. Asokan, Kandasami Won, Sung Ok Chae, Keun Hwa 2024-01-20T05:32:43Z 2024-01-20T05:32:43Z 2021-09-03 2015-12 1567-1739 https://pubs.kist.re.kr/handle/201004/124715 Present work reports the irradiation induced effects in Dy3+ doped cobalt ferrite nanoparticles in the regime of dominant electronic excitation processes induced by 100 MeV O7+ ion irradiation. Irradiation leads to the deterioration of crystalline phase as envisaged by X-ray diffraction. Crystallite size decreases with the increase of irradiation fluence. Disappearance of certain bands in Raman spectra at higher fluence of irradiation confirms the crystalline disorder induced by electronic excitations. Fourier transform infrared spectra show onset of cation migration from tetrahedral site to octahedral site and vice versa. X-ray absorption fine structure measurements depict the preservation of valence state of metal ions after irradiation. These measurements further infer bond breaking process in irradiated materials. Magnetic measurements carried out on these materials indicate slight increase of saturation magnetization at room temperature followed by the decrease of coercive field. Obtained results are discussed on the basis of appropriate mechanism. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV COBALT FERRITE NANOPARTICLES ZINC FERRITE MAGNETIC-PROPERTIES DIELECTRIC-PROPERTIES RAMAN-SPECTROSCOPY ION IRRADIATION SIZE TRACKS Consequences of electronic excitations in CoFe1.90Dy0.10O4 Article 10.1016/j.cap.2015.06.005 1 CURRENT APPLIED PHYSICS, v.15, no.12, pp.1650 - 1656 CURRENT APPLIED PHYSICS 15 12 1650 1656 scie scopus kci ART002067461 000363765300014 2-s2.0-84945310910 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article COBALT FERRITE NANOPARTICLES ZINC FERRITE MAGNETIC-PROPERTIES DIELECTRIC-PROPERTIES RAMAN-SPECTROSCOPY ION IRRADIATION SIZE TRACKS Electronic excitations Crystalline disorder Bond-breaking process Valence state