Electric and dielectric properties of ytterbium substituted spinel ferrites

Spinel ferrites are attractive for high frequency applications due to their larger direct current (dc) resistivity and low dielectric loss. In the present work, Co0.6Zn0.4HoxFe2-xO4 (x = 0.00 and 0.1) spinel ferrites were prepared by sol-gel method. The X-ray diffraction pattern showed that both samples had cubic spinel structure, while in sample (x = 0.1), the secondary phase (HoFeO3) was also observed. The dc resistivity was increased with the addition of holmium ions. As the temperature increased, the dc resistivity was decreased by proving their semiconducting nature. The dielectric properties were also measured as a function of temperature and frequency. The sample which was composed by the substitution of holmium ions contained low value of dielectric loss. The magnetic properties were also experimentally measured by applying the field up to 2000 oersted. The small area covered by hysteresis loop proved that both samples possessed soft nature of magnetic materials.

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Section: Resultssupporting

confidence: 94%

“…The greater value of lattice constant for x = 0.1 sample is due to bigger size of Ho 3+ as compared to Fe 3+ . These results are well matched with previous presented paper results [19,20]. The inner atomic vibrations were estimated from Fourier-transform infrared spectroscopy (FTIR) spectra.…”

Section: Resultssupporting

confidence: 91%

Synthesis And Characterization of Cobalt-Zinc Spinel Ferrites For High Frequency Applications

Aman

Al-Muhimeed

Zaki

et al. 2021

Preprint

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“…These properties play a significant role and are essential due to their uses in high frequency products. These characteristics are extremely dependent on the ways used for the preparation of the material's configuration and cations position (Bibi et al, 2018). Various dielectric parameters are mentioned in table 4.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Experimental Study of Neodymium (Nd3+) Doped Mn-Ni based Spinel Ferrite (Mn0.5Ni0.5NdxFe2-xO4) Nanoparticle using Sol-Gel Method

et al. 2021

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Neodymium (Nd3+) doped Mn-Ni based spinel ferrite with composition of Mn0.5Ni0.5NdxFe2-XO4 (x= 0.00, 0.5, 0.10, 0.15 and 0.20), the nanoparticle was essentially formulated by sol-gel self-ignition method. The impact of Nd3+ doping on structural and electrical properties has been extensively studied. XRD verified the FCC spinel arrangement of the synthesized samples. The Debye Scherer formula is used to determine the crystalline size, which was observed in the nano scale ranging between 6 and 10 nm. XRD was used to validate the composition, crystalline size and determining different structural parameters of sample. It is noted that the lattice parameter changes when the Nd3+ doping concentration was enhanced because smaller radius of Fe3+ ions is replaced by large ionic radius of Nd ions. When Nd concentration raises X-Ray density and dislocation density also rises. FTIR verify the compositions of spinel phase and also examine the absorption bands. There were two major frequency bands one was high frequency band ?1 with range of about 500cm-1. Second was low frequency band ?2 with range of about almost 400cm-1. Dielectric performed in the frequency range of 1 MHz to 3 GHz. It was used to determine the effect of Nd3+ doping on various parameters. Dielectric investigations showed decline in dielectric constant. Impedance analysis revealed reducing values with frequency, due to the increase in material conductivity. Real and imaginary modulus study showed the influence of grain boundaries at low frequencies. These properties played significant role in high frequency applications and semiconductor devices.

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“…Various methods such as ball milling method, citrate precursor method, co-precipitation method [11,30], hydrothermal method [31], Pechini method [32], micro emulsion method [33], solid-state method [34,35], solution-combustion method [11], and sol gel auto combustion method [32,[36][37][38] have already been put to use for SrM synthesis (in pure and doped form). Literature survey shows that sol gel auto combustion has several benefits over other techniques [11,[39][40][41][42]. These benefits include low cost, simplicity, lower phase formation temperature and better control over grain size.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the magnetic properties of M-type strontium ferrite with synergistic effect of co-substitution and calcinations temperature

Godara

Kaur

Narang

et al. 2021

Journal of Asian Ceramic Societies

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SrFe 12 O 19 samples were initially prepared using sol-gel auto-combustion method and calcined from 500 to 1100°C (for 6 h). XRD data established the phase formation temperature of SrM phase to be ≈1000°C. Thereafter, the effect of Zn 2+ -Zr 4+ co-dopant on magnetic and structural properties of SrZn x Zr x Fe 12-2x O 19 (x = 0.00-1.00) samples calcined between 900-1100°C was investigated. XRD data shows that the cell volume increases (from 690.45Å 3 (x = 0.00) to 705.72Å 3 (x = 1.00)) while crystallite size decreases (from 123.9 nm (x = 0.00) to 62.3nm (x = 1.00)) calcined at 1000°C. The Rietveld refinement of XRD data confirms a) x = 0.00 sample to be phase pure and b) the presence of ZnFe 2 O 4 (≈2.25) & SrZrO 3 (≈2.93%) impurity phases in x = 1.00 sample, calcined at 1000°C. FESEM micrographs revealed that a) grain size decreases for x > 0.20 with `x' at 900°C and b) increases from 122 nm at 900°C to 443 nm at 1100°C, for x = 0.00. Broadening of Raman bands reveals generation of strain in the lattice with enhancement of Zn 2+ -Zr 4+ concentration. The magnetic studies reveal that the coercivity monotonically decreases (from 5358(x = 0.00) Oe to 690(x = 1.00) Oe at 1000°C) with enhancement of Zn 2+ -Zr 4+ concentration. A maximum M s value ≈ 70.89 emu/g was observed in x = 0.20 sample at 1100°C. M s value also decreases for x > 0.20 at each calcination temperature.

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Electric and dielectric properties of ytterbium substituted spinel ferrites

Cited by 14 publications

References 24 publications

Synthesis And Characterization of Cobalt-Zinc Spinel Ferrites For High Frequency Applications

Synthesis And Characterization of Cobalt-Zinc Spinel Ferrites For High Frequency Applications

Experimental Study of Neodymium (Nd3+) Doped Mn-Ni based Spinel Ferrite (Mn0.5Ni0.5NdxFe2-xO4) Nanoparticle using Sol-Gel Method

Tailoring the magnetic properties of M-type strontium ferrite with synergistic effect of co-substitution and calcinations temperature

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