Modified ferroelectric/magnetic and leakage current density properties of Co and Sm co-doped bismuth ferrites

Vashisth, Balesh Kumar; Bangruwa, Jarnail S.; Beniwal, Anu; Gairola, S.P.; Kumar, Ashok; Singh, Nidhi; Verma, Vivek

doi:10.1016/j.jallcom.2016.12.278

Cited by 73 publications

(13 citation statements)

References 34 publications

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“…Mg 0.8 Li 0.2 Fe 2 O 4 sample shows highly dense microstructure with average grain size 1–2 μm. Reduction in grain size due to doping may arise due to different diffusion rates of constituting elements of the compounds [20]. This modified microstructure may enhance the magnetic and electrical properties of ferrite samples.…”

Section: Resultsmentioning

confidence: 99%

Ferrites: magnetic materials as an alternate source of green electrical energy

Kharbanda

Madaan

Sharma

et al. 2019

Heliyon

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Ferrites samples Mg1-xLixFe2O4 for x = 0.0, 0.1, 0.2, 0.3, were synthesized by solid-state sintering method. Detailed investigations were made on the structural, morphological, magnetic and electrical proprieties of these samples. A detailed investigation was performed on power generation of these samples and role of Li-doping has been discussed. The X-ray Diffraction (XRD) pattern confirms the spinel phase formation in samples without any impurity. It is observed from Scanning Electron Microscopy that average grain size of samples decreases with lithium doping in MgFe2O4. The saturation magnetization of MgFe2O4 (15.4 emu/g) is found to increase with Lithium percentage and maximum 39.3 emu/g for Mg0.7Li0.3Fe2O4 sample. Ferrites play a crucial role in magnetic recording, microwave magnetic devices and many applications in medical sciences. Recently, it was observed that ferrites can be an alternate source of green energy by inventing hydroelectric cell (HEC). The processes of water adsorption and dissociation on the metal-oxide surface, plays an important role in production of electricity in ferrites. When, water is sprayed on hydroelectric cell the thermodynamic driving force is responsible for the formation of stable metal-oxygen or metal-hydroxyl bonds. The reactivity of ferrite surface towards water is based on the interaction of these ions and the d orbital of the Fe atom. Due to this interaction, water dissociated in H3O+ and OH− ions and migrates toward silver and zinc electrodes respectively. A typical hydroelectric cell of 2 inch diameter produces 17.1 mA of peak current and 949 mV voltage with a maximum output power of 15.85 mW for Li = 0.2 doped MgFe2O4 sample.

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Section: Resultsmentioning

confidence: 99%

Ferrites: magnetic materials as an alternate source of green electrical energy

Kharbanda

Madaan

Sharma

et al. 2019

Heliyon

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“…Compared with the undoped sample, all the other ceramics exhibit a dielectric relaxation character. [39,42] In addition to the broaden peak of the ε r -T peak, the dielectric constant values are slightly decreased and the peak position of ε r also changed toward the high temperature with the frequency increasing. [43] It is evident from Fig.…”

Section: Ferroelectric Propertiesmentioning

confidence: 99%

“…Another reason for the decrement in dielectric constant is that the high frequency provides su cient energy for the electron hopping between Fe 2+ and Fe 3+ ions. [39] In Fig. 7(a), the maximum dielectric constant is obtained for x = 0.4 ceramic at the temperature 329°C (T m ) which corresponds to the Néel temperature (T N ) caused by the magnetic ordering transition from antiferromagnetism to paramagnetism.…”

Section: Ferroelectric Propertiesmentioning

confidence: 99%

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Structure, Dielectric and Multiferroic Properties of Bi0.85Nd0.15Fe0.98Zr0.02O3 in Ba and Ti Co-Doping

Zeng

Zhang

et al. 2021

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Multiferroic (1- x)Bi0.85Nd0.15Fe0.98Zr0.02O3- xBaTiO3 (x = 0, 0.275, 0.3, 0.325, 0.35, 0.375, 0.4) ceramics were synthesized by the conventional solid state reaction method. X-ray diffraction studies confirm the phase transition from rhombohedral perovskite structure to pseudocubic structure with the introduction of BaTiO3. The results of the refinement indicate the BaTiO3 is successfully doped into the crystal lattice. The microstructure analysis shows that the average grain size increases with the introduction of BaTiO3. An increase in remanant polarization has been achieved at room temperature as the BaTiO3 concentration increasing. A greatly reduced leakage current density of about two orders of magnitude is observed in x = 0.375 (J = 2.4×10− 7 A/cm2) ceramic. The dielectric properties have been enhanced by the addition of BaTiO3, which is attributed to the reduction in Fe2+ ions and oxygen vacancies. Due to the grain effect and structure transition caused by the doping of BaTiO3, the magnetization reveals a slight decrease while the coercive field for x = 0.325 (Hc = 1785.8 Oe) increases to 6.4 times of the undoped ceramic.

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“…Although BiFeO 3 has versatile physical properties, its high leakage current limits its technological applications, such as in spintronics, actuators, ferroelectric memories, and optical devices, owing to the existence of various oxidation states of the transition-metal Fe cations and O vacancies. ,− Hence, numerous attempts have been made to reduce the leakage current of BiFeO 3 , and substitution with transition-metal , or rare-earth elements − has been widely recognized as an effective method from the perspective of defect chemistry. Specifically, the crystalline phase of BiFeO 3 has a distorted rhombohedral ABO 3 perovskite structure.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Ferroelectric Properties of Superlattice-Based Epitaxial BiFeO₃ Thin Films via Substitutional Doping Effect

et al. 2019

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Although there is considerable interest in BiFeO3 owing to its versatile physical properties, which make it suitable for a wide range of applications, its high leakage current is a significant limitation. Among various methods for reducing the leakage current, substitution with transition-metal or rare-earth elements is widely recognized as the most effective approach. Herein, to enable in-depth studies of the physical properties of BiFeO3, high-quality epitaxial BiFeO3 thin films with a low leakage current must be formed. However, owing to the difficulty of controlling the element doping when pulsed laser deposition is used for epitaxial thin-film growth, studies on substitutional doping based on epitaxial BiFeO3 thin films have not been systematically carried out. In this regard, we establish an innovative approach for overcoming the high leakage current of BiFeO3 by fabricating artificially engineered superlattice-based epitaxial BiFeO3 thin films in which there is a significant reduction of the leakage current. The control of the element doping in epitaxial BiFeO3 thin films is easily regulated precisely at the atomic-scale level. The results of this study strongly suggest that superlattice-based epitaxial BiFeO3 thin films can be a cornerstone for exploring the reliable fundamental physical properties of substitutional doping in epitaxial BiFeO3 thin films.

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Modified ferroelectric/magnetic and leakage current density properties of Co and Sm co-doped bismuth ferrites

Cited by 73 publications

References 34 publications

Ferrites: magnetic materials as an alternate source of green electrical energy

Ferrites: magnetic materials as an alternate source of green electrical energy

Structure, Dielectric and Multiferroic Properties of Bi0.85Nd0.15Fe0.98Zr0.02O3 in Ba and Ti Co-Doping

Enhancement of Ferroelectric Properties of Superlattice-Based Epitaxial BiFeO₃ Thin Films via Substitutional Doping Effect

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Modified ferroelectric/magnetic and leakage current density properties of Co and Sm co-doped bismuth ferrites

Cited by 73 publications

References 34 publications

Ferrites: magnetic materials as an alternate source of green electrical energy

Ferrites: magnetic materials as an alternate source of green electrical energy

Structure, Dielectric and Multiferroic Properties&nbsp;of Bi0.85Nd0.15Fe0.98Zr0.02O3 in Ba and Ti Co-Doping

Enhancement of Ferroelectric Properties of Superlattice-Based Epitaxial BiFeO3 Thin Films via Substitutional Doping Effect

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Structure, Dielectric and Multiferroic Properties of Bi0.85Nd0.15Fe0.98Zr0.02O3 in Ba and Ti Co-Doping

Enhancement of Ferroelectric Properties of Superlattice-Based Epitaxial BiFeO₃ Thin Films via Substitutional Doping Effect