Dielectric, impedance, and modulus spectroscopic studies of lanthanum-doped nickel spinel ferrites NiLaxFe2-xO4 nanoparticles

Mustafa, Ghulam; Khalid, Muhammad; Chandio, Ali Dad; Shahzadi, Kiran; Uddin, Zaheer; Khan, Junaid Kareem; Channa, Naimat Ullah; Gilani, Zaheer Abbas; Asghar, H. M. Noor ul Huda Khan

doi:10.1007/s10971-020-05359-z

Cited by 18 publications

(13 citation statements)

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“…Where ν1 and ν2 are high frequency and low frequency bands respectively, M shows the molecular weight of the composition. The values of tetrahedral and octahedral radii were also determined using the following formulas: Rtetra = a √3 (u -0.25) -Ro (11) Rocta = a (5/8-u) -Ro (12) Where Rtetra and Rocta represents the tetrahedral and octahedral radii respectively, 'a' is the lattice parameter and 'u' is the oxygen position parameter. For FCC structure the value of oxygen parameters is 0.375.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…Figure 4(b) depicts, the minimal AC-conductivity in the low frequency range can be due to the higher resistance of the grain-boundaries, because of charge carrier exchange (hopping) between Fe 2+ and Fe 3+ ions at octahedral sites, the grains are conductive in the high frequency field. As a result, the hopping frequency rises as the applied electric field frequency rises, and the AC conductivity rises [11]. The applied frequency has a large impact on real and imaginary components of impedance.…”

Section: Tangent Loss and Ac Conductivitymentioning

confidence: 99%

“…showing the real and imaginary impedance decrease with increasing the applied frequency and impedance curves merge with each other at high frequency region, because of the conductive behaviour of grains in the higher-frequency field, the impedance is quite low [11,13].…”

Section: Real and Imaginary Impedancementioning

confidence: 99%

“…Firstly, the real and imaginary components of the electric modulus have quite lower values in the low-frequency field. Electric modulus analysis is showing the real and imaginary parts of electric modulus increase with increasing the frequency of applied field, while the electric modulus become maximum at high frequency region [11,13]. The different calculated values of impedance and electric modulus are depicted in Table 4.…”

Section: Real and Imaginary Electric Modulusmentioning

confidence: 99%

“…The ionic radii of the ions La 3+ and Fe 3+ were being used to explain the average lattice parameter 'a'. The average lattice parameter was found to be decreased with the La 3+ doping contents [11]. X-ray density x can be measured by using the following formula:…”

Section: Xrd Analysismentioning

confidence: 99%

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Synthesis and Characterization of Lanthanum doped Co-Zn Spinel Ferrites Nanoparticles by Sol-Gel Auto Combustion Method

Gilani¹,

Farooq²,

Asghar³

et al. 2021

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Spinel ferrites nanoparticles play a significant role in our everyday lives. In the current work, La3+ doped Co-Zn ferrites with chemical formula Co0.5Zn0.5LaxFe2−xO4 (x = 0.00 to x = 0.2 with step size 0.04) was effectively prepared by sol gel technique. The formation of FCC spinel structure was confirmed by X-Ray diffraction (XRD) analysis. The average crystallite size were calculated to be in the 8 nm to 13 nm range. The lattice parameters were found to be decreased with the doping of lanthanum (La3+) contents. X- Ray density is analyzed to increase as the concentration of (La3+) doping increases, this is due to the fact that La3+ ion has a higher molar weight than Fe3+ ion. The spinel phase structure was affirmed by using FTIR.The two main absorption bands ν1 and ν2 are referred to tetrahedral stretching band and octahedral stretching band respectively, is found to be in the range of at around 400–530 cm− 1. Spinel ferrites, such as Co-Zn spinel ferrites, have dielectric features that make them ideal for use in high-frequency applications. With new potential applications being investigated all the time. Physical properties, synthesis method, as well as sintering temperature and time, are all important factors in regulating the properties of dielectric materials. The dielectric features were measured in the frequency of 1 MHz to 3 GHz range. Lowered dielectric parameters studied across a higher frequency range recommend that such nano crystalline ferrites could be used to fabricate the equipment needed to perform at GHz frequencies.

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Section: Ftir Spectroscopymentioning

confidence: 99%

Section: Tangent Loss and Ac Conductivitymentioning

confidence: 99%

Section: Real and Imaginary Impedancementioning

confidence: 99%

Section: Real and Imaginary Electric Modulusmentioning

confidence: 99%

Section: Xrd Analysismentioning

confidence: 99%

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