Room temperature magnetoelectric coupling in Fe-doped sodium bismuth titanate ceramics

Ruth, D. E. Jain; Rahman, Raja Altaf U; Manikandan, Dhamodaran; Lakshmanan, Venkidu; Balasubramanian, Sundarakannan; Schmid‐Beurmann, Peter; Zhou, Peng; Srinivasan, G.; Murugan, Ramaswamy

doi:10.1016/j.jallcom.2020.154679

Cited by 16 publications

(5 citation statements)

References 66 publications

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“…\frac{c^{2}}{a^{2}} \left.\right) - \frac{3}{2}}{\left(\right. \frac{c^{2}}{a^{2}} \left.\right) + 3} \left]\right.$ in hexagonal, [ 38 ] and the determined δ is listed in Table 2 . It was noted that the reduction in lattice distortion under metal substitution indicates an improvement in structural symmetry toward tetragonal.…”

Section: Resultsmentioning

confidence: 99%

“…(1) 5 in hexagonal, [38] and the determined δ is listed in Table 2. It was noted that the reduction in lattice distortion under metal substitution indicates an improvement in structural symmetry toward tetragonal.…”

Section: Angle Dispersive X-ray Diffractionmentioning

confidence: 99%

“…This analysis revealed a continuous increment in grain size, with values of 0.83 μm for NBT, 1.11 μm for NBFNT25, 1.62 μm for NBFNT50, and 2.04 μm for NBFNT75 samples respectively; this can be attributed to diffusion of Fe and Nb ions in NBT which significantly accelerated the growth rate is decrease surface free energy and is comparable with previously reported results. [38,41,43] According to Zheng et al, the presence of oxygen vacancies at the grain boundaries can considerably hinder grain growth. [44] In present case, a linear increase in grain size was seen with reduction of oxygen vacancy concentration from Table S1, Supporting Information.…”

Section: Microstructurementioning

confidence: 99%

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Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

Venkidu,

Raja,

Ruth

et al. 2023

Energy Tech

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Bulk ferroelectrics hold tremendous potential for the rapidly growing field of photovoltaic applications due to the separation of charge carriers caused by polarization, resulting in a high photovoltage. However, the wider bandgap in ferroelectrics limits their photoresponse. Attempts to tune the bandgap degrade ferroelectric polarization, while increased oxygen vacancy (V) in oxide perovskite hinders electron conduction and undermines ferroelectricity. Therefore, controlling V and maintaining polarization in reduced bandgap ferroelectric photovoltaics remains challenging. To address this, aliovalent Fe3+ and Nb5+ are co‐substituted on the B‐site of Na0.5Bi0.5TiO3 ceramics. Various techniques confirm the controlled V concentration, and UV‐absorption data reveal a reduction in bandgap energy from 3.01 to 2.38 eV through metal substitution. Density functional theory calculations identify a localized intermediate gap state within the bandgap, created by Fe–O hybridization, acting as a charge carrier scaffold and further reducing the bandgap energy to 2.47 eV. Remarkably, the Al/NBFNT75/Ag configuration achieves an augmented short‐circuit current density of 18.92 nA cm−2, while the open‐circuit voltage of the Al/NBFNT50/Ag device reaches 4.13 V. The resulting Al/NBFNT75/Ag device exhibits a maximum photovoltaic power density of 0.725 mW m−2 which is 9.5 times greater than Al/Na0.5Bi0.5TiO3/Ag. This approach successfully reduces V and achieves narrow bandgap conditions through suitable aliovalent substitution, leading to enhanced photovoltaic power, photosensing response, photoresponsivity, and specific detectivity.

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Section: Resultsmentioning

confidence: 99%

Section: Angle Dispersive X-ray Diffractionmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

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Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

Venkidu,

Raja,

Ruth

et al. 2023

Energy Tech

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“…The ferroelectric Na 0.5 Bi 0.5 TiO 3 (NBT) ceramic exhibits a high remanent polarization, and its doping into BFO-based materials can reduce the leakage and increase the electric properties. − Song et al analyzed the electric behaviors of BiFeO 3 -Na 0.5 Bi 0.5 TiO 3 (BFO-NBT) thin films with a lower leakage current (∼10 –7 A/cm 2 ) and a moderate maximum polarization ( P max = 30 μC/cm 2 ) . Chen et al prepared the BiFeO 3 /Na 0.5 Bi 4.5 Ti 4 O 15 composite films, which exhibited a lower leakage current (∼2.35 × 10 –7 A/cm 2 ) and a high saturation polarization ( P s = 124.09 μC/cm 2 ) .…”

Section: Introductionmentioning

confidence: 99%

0.78BiTi_0.1Fe_0.8Mg_0.1O₃-0.22CaTiO₃ Nanoscale-Thick Thin Films for Doping-Enhanced Electric Applications

Changxing

Liang

Junxi

et al. 2023

ACS Appl. Nano Mater.

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The high-quality (0.78-x)BiTi0.1Fe0.8Mg0.1O3-0.22CaTiO3-(x)Na0.5Bi0.5TiO3 nanoscale-thick thin films were prepared successfully on the Pt/Ti/SiO2/Si substrate via the sol–gel method. The influence of Na0.5Bi0.5TiO3 doping on the structure, topography, piezoelectricity, ferroelectricity, and dielectricity of BTFM-CTO-NBT thin films was investigated systematically. The X-ray diffraction and Raman results manifested that NBT doping induced the formation of the tetragonal phase, which existed between the rhombohedral and orthorhombic phases, and the elemental mappings revealed that the distribution of each element was uniform simultaneously. X-ray photoelectron spectroscopy analysis showed that NBT doping could effectively restrain the reduction of Fe3+, thereby reducing the oxygen vacancy concentration. The film had a minimum leakage current of about 3.19 × 10–10 A/cm2, a higher piezoelectric response, a maximum remnant polarization (2P r = 174.64 μC/cm2), and a relatively smaller coercive field (E c = 359.90 kV/cm) as x = 0.05. At the same time, the corresponding film had a maximum dielectric constant (469.6) and a minimum dielectric loss (0.063) at 1 kHz. These insights offer an alternative pathway to enhance the properties of BTFM-CTO thin films.

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“…A few papers have reported the properties of Fe/Mn-doped NBT [19,[19][20][21][22][23][24][25][26][27][28][29], however, most of them are limited to room temperature. There are no studies on the properties of these materials in a poled state.…”

Section: Introductionmentioning

confidence: 99%

Properties of Na0.5Bi0.5TiO3 Ceramics Modified with Fe and Mn

et al. 2022

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Na0.5Bi0.5TiO3 (NBT) and Fe- and Mn-modified NBT (0.5 and 1 mol%) ceramics were synthesized by the solid-state reaction method. The crystal structure, dielectric and thermal properties of these ceramics were measured in both unpoled and poled states. Neither the addition of iron/manganese to NBT nor poling changed the average crystal structure of the material; however, changes were observed in the short-range scale. The changes in shapes of the Bragg peaks and in their 2Θ-position and changes in the Raman spectra indicated a temperature-driven structural evolution similar to that in pure NBT. It was found that both substitutions led to a decrease in the depolarization temperature Td and an increase in the piezoelectric coefficient d33. In addition, applying an electric field reactivated and extended the ferroelectric state to higher temperatures (Td increased). These effects could be the result of: crystal structure disturbance; changes in the density of defects; the appearance of (FeTiˈ-), (Mn′Ti-V••O) and (Mn″Tii-V••O )—microdipoles; improved domain reorientation conditions and instability of the local polarization state due to the introduction of Fe and Mn into the NBT; reinforced polarization/domain ordering; and partial transformation of the rhombohedral regions into tetragonal ones by the electric field, which supports a long-range ferroelectric state. The possible occupancy of A- and/or B-sites by Fe and Mn ions is discussed based on ionic radius/valence/electronegativity principles. The doping of Fe/Mn and E-poling offers an effective way to modify the properties of NBT.

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Room temperature magnetoelectric coupling in Fe-doped sodium bismuth titanate ceramics

Cited by 16 publications

References 66 publications

Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

0.78BiTi_0.1Fe_0.8Mg_0.1O₃-0.22CaTiO₃ Nanoscale-Thick Thin Films for Doping-Enhanced Electric Applications

Properties of Na0.5Bi0.5TiO3 Ceramics Modified with Fe and Mn

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Room temperature magnetoelectric coupling in Fe-doped sodium bismuth titanate ceramics

Cited by 16 publications

References 66 publications

Fe3+‐ and Nb5+‐Substituted Na0.5Bi0.5TiO3: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

Fe3+‐ and Nb5+‐Substituted Na0.5Bi0.5TiO3: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

0.78BiTi0.1Fe0.8Mg0.1O3-0.22CaTiO3 Nanoscale-Thick Thin Films for Doping-Enhanced Electric Applications

Properties of Na0.5Bi0.5TiO3 Ceramics Modified with Fe and Mn

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Product

Resources

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Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

Fe³⁺‐ and Nb⁵⁺‐Substituted Na_0.5Bi_0.5TiO₃: A Route toward Enhanced Ferroelectric Photovoltaic Response in Al/NBFNT/Ag Solar Cell through Reduced Bandgap and Controlled Oxygen Vacancy

0.78BiTi_0.1Fe_0.8Mg_0.1O₃-0.22CaTiO₃ Nanoscale-Thick Thin Films for Doping-Enhanced Electric Applications