Saturation magnetization and band gap tuning in BiFeO3 nanoparticles via co-substitution of Gd and Mn

Hasan, M. M.; Basith, M. A.; Zubair, Md. Abdullah; Hossain, Md. Sarowar; Mahbub, Rubayyat; Hakim, M. A.; Islam, Md. Fakhrul

doi:10.1016/j.jallcom.2016.06.171

Cited by 76 publications

(42 citation statements)

References 45 publications

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“…Figure 7 The calculated band gap values are tabulated in table 3 and clearly shows a decreasing trend with Mo 6+ doping. Band gap energy is reduced from 2.35 eV to 2.26 eV for 15 wt% Mo doping in BBFMO-0 ceramic which is the lowest for BFO to the best of our knowledge [35]. Several studies report that, distortion in FeO 6 octahedron causes different hybridization between O 2− and Fe 3+ which leads to the formation of a unique energy level in between Fe 3d and O 2p states [36].…”

Section: Optical Propertymentioning

confidence: 84%

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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In this work, -Bi Ba Fe Mo O x x 0.8 0.2 13 (x = 0, 0.5, 0.10 and 0.15) ceramics were synthesized by conventional solid-state reaction to evaluate the influence of Ba 2+ and Mo 6+ co-doping on the structure, morphology, electrical, magnetic and optical properties of BiFeO 3 ceramic. Rietveld refinement of x-ray diffraction data was done to obtain the subtle structural information. A tetragonal structure of P4mm type was revealed for Bi Ba FeO 0.8 0.2 3 (x = 0) ceramic. Evolution of rhombohedral (R3c) phase was observed with Mo 6+ doping and a complete transformation to R3c phase from P4mm was found for 15 wt% Mo 6+ doping. This type of transformation causes distortion in the structure and results in changing bond angle. Magnetization was found to be improved with increasing the percentage of Mo 6+ up to 10 wt%. Canting of spin due to the change in Fe-O-Fe bond angle is believed to be the main reason behind this improvement. One secondary phase BaMoO 4 was found and becomes prominent with Mo 6+ doping. Possible formation of this impurity and its correlation with properties are explained. Microstructural analysis was done to observe the Ba 2+ and Mo 6+ co-doping effect on grain size and distribution. A correlation of grain size with electric and magnetic properties is drawn and elucidated. Dielectric constant shows an increasing trend with Mo 6+ doping. Reduction in oxygen vacancy, due to charge compensation upon high charged Mo 6+ addition, believed to be the staple reason behind the dielectric constant increment. Lastly, optical band gap energy found to be decreased with the addition of Mo 6+ and possible reasons behind this are evaluated. Overall, codoping of Ba 2+ and Mo 6+ found to have a positive influence over materials electrical, optical as well as magnetic property.

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Section: Optical Propertymentioning

confidence: 84%

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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“…The band gap of the synthesised BiFeO 3 nanoparticles has been observed to be 2.37 eV, which is blue shifted compared to its bulk counterpart (1.82 eV) [28]. The decrease in the band gap with doping of Ca 2þ ions may be attributed to new energy levels introduced between conduction and valance band [29].…”

Section: Optical Analysismentioning

confidence: 92%

Tactics of particle size for enhanced multiferroic properties in nanoscale Ca‐doped BiFeO₃

Dhir¹,

Uniyal

Verma

2017

Phys. Status Solidi C

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The undoped and Ca‐doped BiFeO3 nanoparticles of different particle size were synthesised using sol‐gel. Ca‐doping induced structural transformation from rhombohedral to orthorhombic phase along with reduced crystallite size due to its smaller ionic radii. Morphological analysis showed increase in particle size from 11 to 50 nm on increasing calcination temperature from 450 to 650 °C. Magnetic and electrical studies revealed enhancement in magnetism as well as dielectric constant and polarisation values with Ca‐doping. When the particle size of Ca‐doped BiFeO3 nanoparticles was further reduced, these values registered remarkable enhancement. Thermal analysis revealed charge compensation mechanism to occur via formation of oxygen vacancies on doping of Ca2+ ions in BiFeO3 lattice. The decreasing dielectric constant values indicating increasing oxygen vacancies content with particle size also point towards the similar charge compensation mechanism in the particle size varied Ca‐doped BiFeO3 nanoparticles.

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“…Other applications for BTO-based materials include piezoelectric devices, electroluminescent panels, pyroelectric elements, polymer matrix composites for embedded capacitance in printed circuit boards, heaters and sensors with positive temperature coefficient of resistivity (PTCR) etc. [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Since the discovery of the interesting dielectric properties of BTO, several works have been reported. Since addition of dopants has always been beneficial in terms of high dielectric properties, BTO has been doped with different types of acceptor or donor dopants [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Donar Dopant on BaTiO <sub>3 </sub> (BTO) Perovskite Structure

Zaman¹,

Mostari²,

Islam³

2017

AJN

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The research was done to understand the influence of nano-sized donar dopant incorporation in barium titanate (BTO) structure. Core-shell structures are stated to form while dopants are added directly to BTO. Low diffusivity of ions in solid state results such core-shell structures. Pure BTO was doped with different concentration of niobium oxide (Nb 2 O 5 ) (0.2, 0.3 and 0.4 mol %). Single stage sintering at 1250°C, 1275°C and 1300°C was initially chosen. Soaking time was varied from 0 to 2 hours. Sintered samples were taken for further characterization. Percent theoretical density (%TD) of the sintered samples was measured. Microstructure of the sintered samples was revealed by Scanning Electron Microscope (SEM). Both temperature and frequency dependent dielectric property was measured using impedance analyzer. X-ray diffraction (XRD) and Differential Thermal Analysis (DTA) was also performed. XRD confirmed the diffusion of Nb 5+ ions into the BTO lattice. While impedance analyzer and DTA proved the shifting of Curie temperature (T C ) from ~120°C to ~71°C. Enhanced dielectric property was observed by the addition of Nb 2 O 5 .

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Saturation magnetization and band gap tuning in BiFeO3 nanoparticles via co-substitution of Gd and Mn

Cited by 76 publications

References 45 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Tactics of particle size for enhanced multiferroic properties in nanoscale Ca‐doped BiFeO₃

Incorporation of Donar Dopant on BaTiO <sub>3 </sub> (BTO) Perovskite Structure

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Saturation magnetization and band gap tuning in BiFeO3 nanoparticles via co-substitution of Gd and Mn

Cited by 76 publications

References 45 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Tactics of particle size for enhanced multiferroic properties in nanoscale Ca‐doped BiFeO3

Incorporation of Donar Dopant on BaTiO &lt;sub&gt;3 &lt;/sub&gt; (BTO) Perovskite Structure

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Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Tactics of particle size for enhanced multiferroic properties in nanoscale Ca‐doped BiFeO₃

Incorporation of Donar Dopant on BaTiO <sub>3 </sub> (BTO) Perovskite Structure