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Structural,morphological and magnetic properties of(Ni_(0.5)Co_(0.5))[Ga_(x)Gd_(x)Fe_(2-2x)]O_(4)nanoparticles prepared via sonochemical approach

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Journal of rare earths 2023年第4期41卷 561-571页

作者： Y.Slimani M.A.Almessiere A.Demir Korkmaz A.Baykal M.A.Gondal H.Güngünes Sagar E.Shirsath A.Manikandan Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Chemistry Istanbul Medeniyet UniversityUskudarIstanbul34700Turkey Department of Nanomedicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Laser Research Group Physics DepartmentIRC-Hydrogen&Energy StorageKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia K.A.CARE Energy Research and Innovation Center King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Department of Physics Hitit University19030Cevre Yolu BulvarCorumTurkey School of Materials Science and Engineering University of New South WalesKensingtonSydneyNSW2052Australia Department of Chemistry Bharath Institute of Higher Education and Research(BIHER)Bharath UniversityChennaiTamil Nadu600073India Center for Catalysis and Renewable Energy Bharath Institute of Higher Education and Research(BIHER)ChennaiTamil Nadu600073India

The impact of Ga^(3+)and Gd^(3+)co-substitution on different types of behavior of Ni-Co nanospinel ferrites(NSFs),(Ni_(0.5)Co_(0.5))[Ga_(x)Gd_(x)Fe_(2-2x)]O_(4)(0.000≤x≤0.025),was *** were fabricated through ultrasound *** structure,composition,and spherical morphology of all products were verified by numerous characterization techniques such as X-ray diffraction(XRD),scanning and transmission electron microscopes(SEM and TEM),and selected area electron diffraction(SAED).Mossbauer spectra are composed of two ferromagnetic sextets and one paramagnetic *** spectra were fitted to extract hyperfine parameters of the doped *** sublattices'hyperfine magnetic field decreases with *** isomer shift values show that the Mossbauer spectra are composed of magnetic Fe^(3+)*** magnetization measurements at variable magnetic field(M-H)were investigated via a vibrating sample magnetometer(VSM)at temperatures(T)from 300 to 10 *** NSFs disclose ferrimagnetic behavior at both 300 and 10 K at which they are soft and hard,*** determined that the remanence magnetization(M_(r)),saturation magnetization(M_(s)),and magneton number(n_(B))decrease with increasing Ga^(3+)and Gd^(3+)ions *** reduction in these values is predominantly recognized to be the impact of cation redistribution and surface spins on tetrahedral(T_(d))and octahedral(O_(h))*** the Ga^(3+)and Gd^(3+)contents increase,the coercivity(H_(c))is also found to decrease.

关键词： Spinel ferrites rare earth substitution Sonochemical synthesis Mossbauer analysis Magnetic properties

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Effect of erbium substitution on thermoelectric properties of complex oxide Ca_3Co_2O_6 at high temperatures

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Journal of rare earths 2008年第2期26卷 168-172页

作者：陆冬青陈刚裴健杨曦线恒泽 Department of Applied Chemistry Harbin Institute of TechnologyHarbin 150001China

Polycrystalline particles of Ca3-xErxCo2O6 （x=0.0, 0.15, 0.3, 0.45 and 0.6） were synthesized using sol-gel method combined with Low Temperature Sintering procedure （LTS） to evaluate the effect of Er substitution on the thermoelectric properties of Ca3Co2O6. The crystal structure and microstructure were investigated using X-ray diffraction, infrared spectroscopy and scanning electron microscope. The electrical conductivity and Seebeck coefficient of the complex oxides were measured from 300 to 1073 K. The results showed that all the sampies were p-type semiconductors. The electrical conductivity increased with the increase in temperature. Er substitutions at Ca site affected carrier concentrations and carder mobility, resulting an increase in Seebeck coefficient and decrease in electrical conductivity. The power factor of Ca2.85Er0.15Co2O6 reached 10.66 μw/mK^2 at 1073 K.

关键词： Ca3Co2O6 thermoelectric properties rare earth substitution cobalt oxide rare earths

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