Effect of substitution of Co2+ ions on the structural and electrical properties of nanosized magnesium aluminate

Ahmad, Javed; Awan, Muhammad Qadeer; Mazhar, Muhammad; Ashiq, Muhammad Naeem

doi:10.1016/j.physb.2010.10.060

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…The lattice parameters along with grain size for BBFO samples against different temperatures were calculated and shown in table 1. Furthermore, details calculations methodology can be seen elsewhere [22][23][24][25][26].…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Awan¹,

Ahmad²,

Waheed³

et al. 2021

Phys. Scr.

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Barium doped BiFeO 3 and Cobalt doped Bi 0.8 Ba 0.2 FeO 3 (BBFO) nanocrystalline multiferroic ceramics were prepared by the sol-gel technique. Rhombohedral symmetry was observed throughout the compositions, and the effect of sintering temperature was observed on volume and grain size of BBFO at (400 °C-700 °C) using x-ray profiles. The final sintering temperature for Cobalt doped (BBFCO) was estimated by using thermal analysis. DC I-V (current-voltage) analysis was used to analyze the leakage current density and conduction mechanism of ceramics. The temperature-dependent electrical resistivity measurements confirmed the metallic behaviour of Co 2+ doped BBFO multiferroics at low temperatures, and transition temperature T MI was also found to be Cobalt concentration-dependent. The dielectric response, electrical impedance, and Modulus of the material were measured in the frequency range 100Hz to 2MHz at room temperature. Trends or occurrences may be attributed to oxygen vacancies arise due to doping content.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Awan¹,

Ahmad²,

Waheed³

et al. 2021

Phys. Scr.

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“…This characteristic is attributed to the resonance between the applied electric field and the polaron hopping frequency. 6 A hump (shoulder) observed in pristine Mg 0:5 Zn 0:5 Al 2 O 4 and Ni-doped Mg 0:5 Zn 0:5 Al 2 O 4 in low frequency region is assigned to the resonance effect. At resonance frequency, the dielectric loss decreases abruptly approaching to the relaxation process whereas at frequency greater than resonance frequency, the electric dipoles change their direction very fast which in turn hinders the alignment of charge carriers and reduces the accumulation of charges at grain boundaries in the material under observation.…”

Section: Dielectric Studiesmentioning

confidence: 96%

“…The effect of doping of Zn 2þ at Mg 2þ site has been found to be resistive in nature with low dielectric constant and highly reduced dielectric loss usable in electrical insulation, substrates for integrated circuits, and microwave technology. 6 The conventional method of preparation of MgAl 2 O 4 spinel is to calcine the mixture of MgO and Al 2 O 3 or other raw materials at high temperature. As it is an important high refractory electro-insulating and constructional material with application in electro-technical, metallurgical, chemical and radio-technical industry, it is accordingly prepared by solidstate route depending on the dispersity of the initial materials, the type and the quantity of the components of the material in the temperature range 1000-1600 ○ C. It is often challenging to prepare support materials that meet all these design criteria.…”

Section: Introductionmentioning

confidence: 99%

Low dielectric constant and signature of ferroelectric nature in transition metal (Co, Ni, Cu)-doped Mg0.5Zn0.5Al₂O₄ aluminates

2019

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This paper throws light on the preparation of transition metal-doped Mg[Formula: see text]Zn[Formula: see text]Al2O4 ([Formula: see text], 0.05 and [Formula: see text], Ni, Cu) aluminates via solid-state reaction route. The X-ray diffraction characterization analysis confirmed that all the samples have crystallized into the psuedocubic phase having space group Fd3[Formula: see text] and were single phased. The incorporation of transition metals viz. Co[Formula: see text], Ni[Formula: see text], Cu[Formula: see text] in the Mg[Formula: see text]Zn[Formula: see text]Al2O4 matrix does not result in the appearance of new peaks or any considerable shift in diffraction peaks within the limits of XRD experimentation. This infers homogeneous dispersion of dopants at the Mg-site which is attributed to nearly same ionic radii of the dopants to that of Mg-site in Mg[Formula: see text]Zn[Formula: see text]Al2O4. Lattice structure, bonding nature and hence the spinel formation were verified through Raman scattering technique. The compositional verification was carried out via energy dispersive analysis of X-rays (EDAX). The surface morphology and hence the microstructural studies were carried out using field emission scanning electron microscopy (FESEM). The synthesized Mg[Formula: see text]Zn[Formula: see text]Al2O4 ([Formula: see text], 0.05 and [Formula: see text], Ni, Cu) aluminate samples were tested for polarization studies keeping their insulating nature into consideration and they displayed a sign of well-behaved P-E loop.

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“…decrease in the orthorhombic strain. The X-ray density, bulk density and porosity for all samples were determined using the following relations [35]…”

Section: Structural and Morphological Propertiesmentioning

confidence: 99%

Effect of Re and Tm-site on morphology structure and optical band gap of ReTmO3 (Re: La, Ce, Nd, Gd, Dy, Y and Tm: Fe, Cr) prepared by sol-gel method

et al. 2018

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Rare earth nano sized pollycrystalline orthoferrites and orthocromites ReT mO3 (Re = La, Nd, Gd, Dy, Y and T m = Fe, Cr) have been synthesized by sol-gel auto combustion citrate method. The samples have been characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy. The samples are single phase as confirmed by XRD analysis and correspond to the orthorhombic crystal symmetry with space group pbnm. Debye Scherer formula and Williamson Hall analysis have been used to calculate the average grain size which is consistent with that of determined from SEM analysis and varied between 25-75 nm. The elemental compositions of all samples have been checked by EDX analysis. Different crystallographic parameters are calculated with strong structural correlation among Re and Tm sites. The optical energy band gap has been calculated by using Tauc relation estimated to be in the range of 1.77 - 1.87 eV and 2.77 - 3.14 eV, for ReFeO3 and ReCrO3, respectively.

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Effect of substitution of Co2+ ions on the structural and electrical properties of nanosized magnesium aluminate

Cited by 17 publications

References 21 publications

Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Low dielectric constant and signature of ferroelectric nature in transition metal (Co, Ni, Cu)-doped Mg0.5Zn0.5Al₂O₄ aluminates

Effect of Re and Tm-site on morphology structure and optical band gap of ReTmO3 (Re: La, Ce, Nd, Gd, Dy, Y and Tm: Fe, Cr) prepared by sol-gel method

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Effect of substitution of Co2+ ions on the structural and electrical properties of nanosized magnesium aluminate

Cited by 17 publications

References 21 publications

Facile synthesis and characterizations of Co2+ doped Bi0.8Ba0.2FeO3 nano-crystalline multiferroic ceramics

Facile synthesis and characterizations of Co2+ doped Bi0.8Ba0.2FeO3 nano-crystalline multiferroic ceramics

Low dielectric constant and signature of ferroelectric nature in transition metal (Co, Ni, Cu)-doped Mg0.5Zn0.5Al2O4 aluminates

Effect of Re and Tm-site on morphology structure and optical band gap of ReTmO3 (Re: La, Ce, Nd, Gd, Dy, Y and Tm: Fe, Cr) prepared by sol-gel method

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Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Facile synthesis and characterizations of Co²⁺ doped Bi_0.8Ba_0.2FeO₃ nano-crystalline multiferroic ceramics

Low dielectric constant and signature of ferroelectric nature in transition metal (Co, Ni, Cu)-doped Mg0.5Zn0.5Al₂O₄ aluminates