Study of diffuse PhaseTransition behavior in Bi and Li Co-substituted barium titanate ceramics

Alkathy, Mahmoud S.; JamesRaju, K.C.

doi:10.1007/s10832-016-0060-z

Cited by 16 publications

(4 citation statements)

References 45 publications

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“…Alkathy et al reported that in Bi- and Li-co-doped BaTiO 3 , grain size distribution is a significant factor affecting the diffuse character of the dielectric permittivity peak. As the concentrations of Bi and Li increased, the average grain size decreased, and diffusivity increased [ 30 ]. Armstrong et al showed that the permittivity of BaTiO 3 modified with 2 wt% ZrO 2 resulted in a suppressed ferroelectric transition region.…”

Section: Resultsmentioning

confidence: 99%

Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

Gui

Yuan

et al. 2023

Materials

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In this work, a Mn-and Yb-doped BaTiO3-(Na0.5Bi0.5)TiO3 ferroelectric relaxor was designed and prepared. The effects of Mn on the microstructures, dielectric and electrical properties of the ceramics were investigated. The X-ray structural analysis shows a perovskite structure. The SEM images show the homogeneous microstructure of ceramics with an average grain size of about 1 μm. The temperature-dependent permittivity shows relaxor characteristics as Mn-doped. Mn at a low level (x ≤ 0.005) is beneficial for low dielectric loss and high resistivity. The maximum resistivity of ≥3 × 1012 Ω cm and minimum dielectric loss of ≤0.06 can be achieved at x ≤ 0.005. The resistivity of the ceramics follows the Arrhenius law with activation energy decreasing from ~1.31 to 1.01 eV as x increases. With lower Mn dopant, oxygen vacancies and charge carrier concentration partially decrease with Mn doping, which is helpful to improve the insulation resistance and decrease the dielectric loss.

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Section: Resultsmentioning

confidence: 99%

Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

Gui

Yuan

et al. 2023

Materials

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“…The broadening of the A 1 (TO 3 ) mode after irradiation was due to the overlap of the different modes [42]. Interestingly, most Raman modes shift to lower wavenumbers after gamma irradiation, which could be attributed to the shift of Ti cations or octahedral distortion [43][44][45][46] (see Figure 3 and Table 2). Furthermore, the decrease in the intensity of A 1 (LO 3 ) mode after gamma irradiation confirmed the disorder caused by gamma irradiation [47].…”

Section: Resultsmentioning

confidence: 99%

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

2022

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Materials with ferroelectric properties, low bandgap energies, high polarization, low loss, and thermal stability are essential for future solar-cell applications. Researchers have attempted to obtain such materials by using several approaches. In this vein, a novel approach is reported in this work using gamma ray irradiation. The effect of gamma radiation on the structural, optical, and ferroelectric characterizations of bismuth (Bi)-doped barium titanate (BaTiO3 (BT)), namely Ba0.95Bi0.05TiO3 ceramics (abbreviated as (Bi:BT)), was investigated. X-ray diffraction, structure refinement, and Raman study revealed the presence of a perovskite structure with a tetragonal phase in all investigated samples. Morphological study revealed a nonuniform grain size and some porosity. Gamma irradiation-induced combined effects were proved by a detailed analysis of bond lengths, bond angles, octahedral distortions, oxygen vacancies, and charge compensations. Electron paramagnetic resonance (EPR) study gave direct evidence of oxygen vacancies in the irradiated samples. After gamma irradiation, UV–vis study indicated a decrease in the bandgap from 3.14 to 2.80 eV and a significant increase in visible light absorption. Cole–Cole plots confirm as an increase in gamma-ray dose results in higher levels of electron hopping. Study of the P–E hysteresis loop demonstrated that ferroelectric properties could be maintained after gamma irradiation, with a slight decrease in remnant polarization. The behaviour of the P–E was correlated with increasing gamma dose in the investigated ceramics, demonstrating a strong gamma dependence in the loops’ profile. We guess that the present approach may be a promising technique for enhancing the multifunctionality of electronic devices.

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“…For A-site acceptor−donor codoping, (Li + , Bi 3+ ) cosubstituted BaTiO 3 was fabricated by Alkathy et al 386 A diffusion phase transition was observed in the doped ceramic. The diffusion phase transition behavior can be induced by a variety of reasons such as compositional fluctuation, micropolar regions, or conjugation of order parameter with local disorder mode over the local strain.…”

Section: Chemical Reviewsmentioning

confidence: 99%

“…Barium titanate (BaTiO 3 ) is probably the most widely studied and used multifunctional ferroelectric ceramic. A great deal of experimental and theoretical researches on both aliovalent and isovalent doping in BaTiO 3 has produced great insights, which are constantly growing. ,,,,,− …”

Section: Ferroelectricsmentioning

confidence: 99%

Defects and Aliovalent Doping Engineering in Electroceramics

et al. 2020

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Since the positive influences of defects on the performance of electroceramics were discovered, investigations concerning on defects and aliovalent doping routes have grown rapidly in the fields of inorganic chemistry and condensed matter physics. In this article, we summarized the types of defects in electroceramics as well as characterization tools of defects and highlighted the effects of intrinsic and extrinsic defects on the material performances with the emphasis on dielectric, ferroelectric, and piezoelectric properties. We mainly introduced defect related theoretical simulation and experimental results in several typical incipient ferroelectrics, ferroelectrics, and antiferroelectrics. Hence, the influences of defects on the crystal lattice were summed up, and then the main physical mechanisms were highlighted. Particularly, the performance enhancements of aliovalently doped electroceramics were also evaluated and reviewed. Finally, the outlook and challenges were discussed on the basis of their current developments. This article covers not only an overview of the state-of-the-art advances of defects and aliovalent doping routes in electroceramics but also the future prospects that may open another window to tune the electrical performance of electroceramics via intentionally introducing certain defects.

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Study of diffuse PhaseTransition behavior in Bi and Li Co-substituted barium titanate ceramics

Cited by 16 publications

References 45 publications

Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

Defects and Aliovalent Doping Engineering in Electroceramics

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