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Structural,thermomagnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2-xO4(x=0,0.025,0.050,0.075,and 0.1)

Journal of Advanced Ceramics 2020年第2期9卷 243-254页

作者： lakshita phor Vinod KUMAR Hydrogen Lab Department of PhysicsDCR University of Science and TechnologyMurthal-131039HaryanaIndia

In this paper,effect of Gd^3+was investigated on structural,magnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4(x=0,0.025,0.050,0.075,and 0.1)nanoparticles prepared by facile coprecipitation method.X-ray diffraction(XRD)studies confirmed the single cubic spinel phase for all the samples and showed that lattice parameter(aexp)was found to increase from 8.414 to 8.446Åwith the substitution of Gd3+ions due to their larger ionic radii than the replaced Fe3+*** and size of developed nanoparticles were studied using transmission electron microscopy(TEM)and found that particle size decreased from 31.06 to 21.12 nm for x=0–*** properties showed that maximum magnetization decreased from 39.21 to 23.59 emu/g,and Curie temperature decreased from 192 to 176℃with increase in x from 0 to 0.1 due to weakening of superexchange *** parameters like dielectric constant(e¢ande¢),dielectric loss(tanδ),AC conductivity(σac),and impedance(Z¢and Z¢)as a function of frequency and composition were analyzed and *** was found thate¢,e¢,σac,and tanδvalues decreased with Gd substitution,which has been explained based on Maxwell–Wagner theory and hopping mechanism of electrons between Fe3+and Fe2+ions at octahedral *** plots for all the developed compositions showed single semi-circular arc which indicate the dominant effect of grain boundaries.

关键词： spinel ferrite coprecipitation method structural property magnetism dielectric property

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Zn^(2+) substituted superparamagnetic MgFe_(2)O_(4) spinel-ferrites:Investigations on structural and spin-interactions

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Journal of Advanced Ceramics 2020年第5期9卷 576-587页

作者： lakshita phor Surjeet CHAHAL Vinod KUMAR Department of Physics Deenbandhu Chhotu Ram University of Science and TechnologyMurthal 131039HaryanaIndia

Nano-magnetic ferrites with composition Mg_(1-x)Zn_(x)Fe_(2)O_(4)(x=0.3,0.4,0.5,0.6,and 0.7)have been prepared by coprecipitation method.X-ray diffraction(XRD)studies showed that the lattice parameter was found to increase from 8.402 to 8.424A with Zn^(2+) ion content from 0.3 to *** transform infrared(FTIR)spectra revealed two prominent peaks corresponding to tetrahedral and octahedral at around 560 and 430 cm^(-1) respectively that confirmed the spinel phase of the *** electron microscopy(TEM)images showed that the particle size was noted to increase from 18 to 24 nm with an increase in Zn content from x=0.3 to *** magnetic properties were studied by vibrating sample magnetometer(VSM)and electron paramagnetic resonance(EPR)which ascertained the superparamagnetic behavior of the samples and contribution of superexchange *** maximum magnetization was found to vary from 23.80 to 32.78 emu/g that increased till x=0.5 and decreased ***,X-ray photoelectron spectroscopy(XPS)was employed to investigate the chemical composition and substantiate their oxidation states.

关键词： nanoparticles(NPs) nanospinel ferrites structural properties magnetism coprecipitation method

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