Enhanced magnetic and magnetodielectric properties of Co-doped brownmillerite KBiFe2O5 at room temperature

Chandrakanta, K.; Jena, Rasmita; Pal, P.; Abdullah, Md. F.; Kaushik, S.D.; Singh, Anil Kumar

doi:10.1016/j.jallcom.2021.161294

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…The (RQC)(RQC) is nothing but the series representation of two (RQC) circuits in which the first and second circuit, respectively, indicates the contribution of grains and grain boundaries. [ 24 ] Figure 8 shows the schematic representation of these contributions. At lower frequencies, the long‐range movement of charge carriers via grain boundaries determines resistance and capacitance.…”

Section: Resultsmentioning

confidence: 99%

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈

Panda,

Choudhary

2023

Physica Status Solidi (b)

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A new compound of chemical formula (BiBa)(FeMn2)O8 is prepared by a solid‐state reaction method. X‐ray structural studies confirm orthorhombic unit cell of the compound. Room‐temperature magnetic data display ferromagnetic hysteresis loop with high value of effective magnetic moments. The dependence of dielectric constant, loss tangent, impedance, and the conductivity at different frequencies (1 kHz−1 MHz) are measured using LCR meter on rise of temperature from room temperature to 500 °C. The dielectric constant increases on rise of temperature due to Maxell–Wagner polarization, and the loss tangent displays similar behavior. A low value of loss tangent is obtained at higher frequencies, which paves the way for the application of the compound in high‐frequency devices. The real impedance of the compound decreases indicating NTCR (negative temperature coefficient of resistance) behavior, and the imaginary impedance displays relaxor behavior. The Nyquist plot fits to a series combination of two RQC circuits ((RQC)(RQC)) and indicates the presence of non‐Debye relaxation. The frequency variation of conductivity obeys Jonscher's power law and reveals different conduction mechanisms in grain and grain boundary regions.

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Section: Resultsmentioning

confidence: 99%

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈

Panda,

Choudhary

2023

Physica Status Solidi (b)

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“…The magnetoelectric term that couples the two subsystems could be given by:

We assume a quadratic magnetoelectric coupling g in KBFO because of the big difference between the ferroelectric Curie temperature

and the magnetic phase transition temperature

. Moreover, the biquadratic nature of the magnetoelectric coupling is also confirmed using the Landau free theory [ 15 ].…”

Section: The Model and The Green’s Functionsmentioning

confidence: 97%

“…The doping effects with different ions (La, Y, Co, Ho, Ru, and Al) on structural, magnetic, electrical, and optical properties of KBFO have also been investigated [ 13 , 14 , 15 , 16 , 17 , 18 ]. The doping ions can change the properties of the compound.…”

Section: Introductionmentioning

confidence: 99%

“…The doping ions can change the properties of the compound. By doping with Co or Al (at the Fe site) and with La, Y or Ru (at the Bi site), the magnetization increases (attributed to the modification of spin canting), whereas the band gap decreases [ 13 , 15 , 16 , 18 ]. The decrease in band gap can be due to the tilting of the Fe-O tetrahedral structure of Co-doped KBFO.…”

Section: Introductionmentioning

confidence: 99%

“…An increase in magnetization, band gap energy, and photocatalytic efficiency was observed for Y ion-doped KBFO by Rai et al [ 14 ]. Chandrakanta et al [ 15 ] have contributed to the understanding of the dielectric properties of Co-doped KBFO, demonstrating an enhancement in these properties. The intricate interplay between the dopant ions and the various properties of KBFO highlights the versatility of doping as a strategy to tailor the material’s characteristics for specific applications.…”

Section: Introductionmentioning

confidence: 99%

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Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Apostolov,

Apostolova,

Wesselinowa

2023

Materials

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The magnetic, electric, dielectric, and optical (band gap) properties of ion doped multiferroic KBiFe2O5 (KBFO) have been systematically investigated utilizing a microscopic model and the Green’s function theory. Doping with Co at the Fe site and Ru at the Bi site induces changes in magnetization, coercive field, and band gap energy. Specifically, an increase in magnetization is observed, while the coercive field and band gap energy decrease. This behavior is attributed to the distinct ionic radii of the doped and host ions, leading to alterations in the exchange interaction constants. The temperature dependence of the polarization P reveals a distinctive kink at the Neel temperature TN, which shifts to higher temperatures with an increase in the applied magnetic field h. Furthermore, doping with Ru and La leads to an increase in polarization. The temperature dependence of the dielectric constant exhibits two peaks at the Neel temperature TN and the Curie temperature TC. Notably, these peaks diminish with increasing frequency. Additionally, the dielectric constant demonstrates a decrease with the rise in the applied magnetic field h. This study sheds light on the intricate interplay between ion doping, structural modifications, and multifunctional properties in KBFO, offering valuable insights into the underlying mechanisms governing its behavior across various physical domains.

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Photocatalytic properties of BiFeO3 (BFO) synthesized by microwave-assisted hydrothermal method

Knuth,

Ücker

et al. 2024

J Solid State Electrochem

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Enhanced magnetic and magnetodielectric properties of Co-doped brownmillerite KBiFe2O5 at room temperature

Cited by 13 publications

References 24 publications

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈

Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Photocatalytic properties of BiFeO3 (BFO) synthesized by microwave-assisted hydrothermal method

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Enhanced magnetic and magnetodielectric properties of Co-doped brownmillerite KBiFe2O5 at room temperature

Cited by 13 publications

References 24 publications

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn2)O8

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn2)O8

Multiferroic Properties of Co, Ru, and La Ion Doped KBiFe2O5

Photocatalytic properties of BiFeO3 (BFO) synthesized by microwave-assisted hydrothermal method

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Product

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Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈

Electrical, Dielectric, and Magnetic Characteristics of (BiBa)(FeMn₂)O₈