Effect of Mn doping on structural, dielectric and magnetic properties of BiFeO3 thin films

Riaz, Saira; Shah, Syed Mazhar; Akbar, Aseya; Atiq, Shahid; Naseem, Shahzad

doi:10.1007/s10971-014-3461-y

Cited by 44 publications

(6 citation statements)

References 41 publications

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“…This results in steady dielectric constant at high frequencies. 40,41 In addition, this variation of the dielectric constant and tangent loss is in accordance with the Maxwell-Wagner model. According to this model, a polycrystalline specimen is composed of grains and grain boundaries, which give rise to inhomogeneity in the structure.…”

Section: Resultssupporting

confidence: 79%

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Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Riaz

Sajid-ur-Rehman

Abutalib

et al. 2016

Journal of Elec Materi

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is the most versatile and important ceramic material, having applications in various fields including electronic devices. It is stable at high temperatures and is chemically inert. The sol-gel method, a relatively lowertemperature technique, has been used to synthesize aluminum oxide nanofibers. The molarity of the sol concentration was varied as 0.7 M, 0.8 M, 0.9 M, 1.0 M, and 1.1 M. The structural, optical, and dielectric properties of the assynthesized nanofibers were characterized. x-ray diffraction (XRD) analysis results confirmed formation of a-Al 2 O 3 phase of aluminum oxide, notably without any heat treatment or use of water as solvent. The crystallite size and unit cell volume of the nanofibers increased as the sol concentration was increased to 0.9 M, but further increase in sol concentration resulted in reduction of crystallite size and increase in dislocations. Scanning electron microscopy (SEM) results revealed uniform distribution of nanofibers ($25 nm to 30 nm) under all conditions. Nanofibers prepared using sol concentration of 0.9 M showed high transmission ($89%) in the visible and infrared regions. The energy bandgap varied from 3.69 eV to 4.1 eV with the variation in molar concentration. Lower bandgap correlated with defect-induced states in the bandgap. The high refractive index is indicative of high density of aluminum oxide nanofibers. High grain-boundary resistance (1.455 MX) and high dielectric constant ($15.76) along with low tangent loss were observed at molar concentration of 0.9 M.

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Section: Resultssupporting

confidence: 79%

“…According to this model, a polycrystalline specimen is composed of grains and grain boundaries, which give rise to inhomogeneity in the structure. 40,41 Grains have low resistance and are separated by grain boundaries with high resistance compared with grains. Electrons reach the grain boundary and accumulate there.…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Riaz

Sajid-ur-Rehman

Abutalib

et al. 2016

Journal of Elec Materi

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“…In this study, the decrease in crystallite size from 32.1230 to 28.974 nm may be responsible for the increase in ε’ from ~ 550 in undoped sample, x = 0.00 to ~ 845 in doped sample. As crystallite size decreased the grain boundaries increase which preventing the hopping process between the different states and grains 23 . As a result, the Ca 2+ ions accumulate at the grain boundaries, raising the resistance and the dielectric constant values.…”

Section: Resultsmentioning

confidence: 99%

Role of Ca2+ doping on the enhancement of dielectric properties of Sr2–xCaxNiWO6 for energy storage device application

Saadon

Taib

Loy

et al. 2023

Sci Rep

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In this paper, Sr2–xCaxNiWO6 (x = 0.00, 0.02, 0.04, 0.06) were synthesized using a solid-state reaction method. The crystal structure, optical and dielectric properties of the compounds were examined using X-ray diffraction (XRD), scanning electron microscope (SEM) with energy dispersive (EDX) analysis, Ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy and electrochemical impedance spectroscopy respectively. The Rietveld refinement of XRD confirmed that the compounds crystallized in a tetragonal structure with a space group I4/m. According to the SEM images, the grain sizes of the compounds decreased as the dopant increased. The UV–vis analysis revealed that the band gap energy of the compounds decreased from 3.17 eV to 3.13 eV as the amount of doping increased from x = 0.00 to x = 0.06. A dielectric characterization showed that the dielectric constant (ε′) and dielectric loss (tan δ) for all compounds possessed a similar trend where it was higher in low-frequency area (~ 1 Hz) and dropped instantaneously with the enhancement of frequency up to 1 MHz until it reached constant values.

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“…As a typical various valence element, Mn forms multivalent ions during sintering process to produce multiply influences on ceramics, including pinning ferroelectric domain, enhancing grain growth, etc. Hence, Mn has been regarded as one of the most efficient elements to improve piezoelectric properties, and the validity has been confirmed by many experiments . For BNT‐based ceramics, Mn doping usually reduces domain wall mobility to act as acceptor additive, since the radius of the lower valence Mn ions are closed to that of Ti 4+ in B site.…”

Section: Introductionmentioning

confidence: 93%

“…Hence, Mn has been regarded as one of the most efficient elements to improve piezoelectric properties, and the validity has been confirmed by many experiments. 9,10 For BNT-based ceramics, Mn doping usually reduces domain wall mobility to act as acceptor additive, 11 since the radius of the lower valence Mn ions are closed to that of Ti 4+ in B site. However, some research results show Mn doping behaves the characteristics of both the "soft" and the "hard" effects simultaneously when Mn content is low.…”

Section: Introductionmentioning

confidence: 99%

Mn doping effects on electric properties of 0.93(Bi_0.5Na_0.5)TiO₃‐0.07Ba(Ti_0.945Zr_0.055)O₃ ceramics

et al. 2018

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The validity of Mn element on 0.93(Bi0.5Na0.5)TiO3‐0.07Ba(Ti0.945Zr0.055)O3 ceramics (BNT‐BZT‐xMn) is certified by doping. On account of multiple effects introduced by Mn, the appropriate Mn content facilitates property improvement effectively. Compared with pure BNT‐BZT, d33 of the component x = 0.25 increases about 8% up to 187 pC/N and Qm of the component x = 1 increases about 84% up to 197. Thermally stimulated depolarization currents (TSDC) measurement reveals Mn additive is helpful to pyroelectric properties as well. The Mn‐doped component x = 0.125 exhibits better pyroelectric performance at room temperature. Corresponding pyroelectric coefficient and the figures of merit reach up to 0.061 μC/(cm2 °C), Fi=217 pm/V, Fν = 0.023 m2/C, and Fd = 12.6 μPa−1/2, respectively, even superior to lead‐based ceramics. Similar pyroelectric advantage is also observed in the component x = 0.5 near depolarization temperature Td. Mn doping has slight harmful influence on the ferroelectric‐to‐relaxor transition temperature TF−R, as well as Td, but hardly shows restriction on application. These results confirm Mn doping is an available strategy to improve BNT‐based ceramics. Therefore, Mn‐doped BNT‐BZT ceramics will be excellent candidates in area of high‐power piezoelectric application and pyroelectric detectors.

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Effect of Mn doping on structural, dielectric and magnetic properties of BiFeO3 thin films

Cited by 44 publications

References 41 publications

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Role of Ca2+ doping on the enhancement of dielectric properties of Sr2–xCaxNiWO6 for energy storage device application

Mn doping effects on electric properties of 0.93(Bi_0.5Na_0.5)TiO₃‐0.07Ba(Ti_0.945Zr_0.055)O₃ ceramics

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Effect of Mn doping on structural, dielectric and magnetic properties of BiFeO3 thin films

Cited by 44 publications

References 41 publications

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Structural, Optical, and Dielectric Properties of Aluminum Oxide Nanofibers Synthesized by a Lower-Temperature Sol–Gel Approach

Role of Ca2+ doping on the enhancement of dielectric properties of Sr2–xCaxNiWO6 for energy storage device application

Mn doping effects on electric properties of 0.93(Bi0.5Na0.5)TiO3‐0.07Ba(Ti0.945Zr0.055)O3 ceramics

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Mn doping effects on electric properties of 0.93(Bi_0.5Na_0.5)TiO₃‐0.07Ba(Ti_0.945Zr_0.055)O₃ ceramics