Correlation between local structure and electronic properties of BaZrO3:TbYb Optical Ceramics

Fassbender, Rafael Uarth; Teixeira, Verônica C.; Galante, Douglas; Ferrer, Mateus M.; Jardim, Pedro Lovato Gomes; Ratmann, Cristiane Raubach; Cava, Sergio; Moreira, Mário L.

doi:10.1016/j.elspec.2021.147106

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…With the assistance of computer simulation, the generated outcome in Figure demonstrates the increasing magnitude of the proton trapping effect as a function of number of dopants in the proton neighborhood. The increase in dopant numbers compels local structural perturbations and altered charge chemistry that favors enhanced activation energy. , Aforementioned results justify and present a linear relationship between doping concentration and proton trapping phenomenon. In regard to the former results and prior established research, the optimal doping concentrations of acceptor substituents are detected to lie at a lower doping range which in the case of Y 3+ and Gd 3+ was evaluated to hover between x = 0.2–0.25, respectively, to achieve considerable proton conductivity.…”

Section: Impact Of Acceptor Dopant On Perovskite Type Bazro3 Proton C...mentioning

confidence: 88%

Technological Challenges and Advancement in Proton Conductors: A Review

Vignesh

Rout

2023

Energy Fuels

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Proton conductors (PCs) are multifunctional perovskite materials with structural, electrical, and chemical compatibilities that serve as principal components in proton conducting solid oxide fuel cells (PC-SOFC). The synergetic advantages of PC-SOFC dominate lucrative applications of conventional SOFC. However, adequate advantages accompany certain key limitations in PCs. The inverse interplay between proton conductivity and chemical stability are two broader challenges which demonstrate a clear trade-off. As a consequence, different reactive constituents within the host BaCeO 3 and BaZrO 3 PCs enforce the gradient in chemical stability under diverse atmospheres, while altered charge chemistry and structural perturbations escalate the activation barrier and impose reduced proton conductivity. Such occurrences are more pronounced in acceptor-doped PCs. Although material engineering via acceptor defect substitutions assists protonation and charge dynamics, on the other hand, it provokes novel challenges (proton trapping effect) at a higher dopant volume fraction beyond the threshold. The principal entropy among chemical and electrophysical parameters is proportionally associated with dopant-incorporated subcategorical material limitations. In this study, a compilation of factors responsible for structural and electrophysical diversities as a consequence of compositional-induced symmetry variations is highlighted with a plausible conclusion and future research perspectives for smart and advanced energy applications.

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Section: Impact Of Acceptor Dopant On Perovskite Type Bazro3 Proton C...mentioning

confidence: 88%

Technological Challenges and Advancement in Proton Conductors: A Review

Vignesh

Rout

2023

Energy Fuels

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“…It is assumed that in the case of an ideal cubic perovskite (ABO3), no first-order active modes would be observable in the Raman spectra since the phonons of its zone centre are in a centrosymmetric position [39,40]. However, according to the literature reports active first-order Raman modes can be detected for real cubic perovskites when their centrosymmetry is violated or distorted by defects caused by acceptor doping, deformations, or impurities [38,41].…”

Section: Materials Chemical Stability In Different Atmospheresmentioning

confidence: 99%

Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Tarutina,

Starostina,

Vdovin

et al. 2023

Chim.Tech.Acta

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Mixed ion-electron conductors (MIECs) are promising materials for air electrodes for protonic ceramic fuel cells (PCFCs) or oxygen permeation membranes. In this work, various aspects of the chemical stability of Co-free MIEC materials, BaCe0.7–xFexZr0.2Y0.1O3–δ, were studied, including their interaction with another functional material (BaCe0.5Zr0.3Y0.1Yb0.1O3–δ-based proton-conducting electrolyte) and gas components (H2O, CO2, and H2). Chemical compatibility studies indicate no visible chemical interaction between the electrode and electrolyte materials even at 1200 °C, which is significantly higher than the operating temperatures (600–800 °C) of PCFCs. The treatments of BaCe0.7–xFexZr0.2Y0.1O3–δ in different atmospheres at 1100 °C, according to the XRD, SEM, IR and Raman spectroscopy data, resulted in the formation of impurity phases. However, their extremely small amounts suggest that they may not form at the operating temperatures. Thus, it can be assumed that the studied materials can be good candidates for various electrochemical applications.

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“…BaZrO 3 is a typical perovskite structure material [3], characterised by high thermal conductivity, high mechanical strength, low thermal expansion system, high bandgap width, medium electrical conductivity and corrosion resistance, which is widely used in fuel cells [4][5][6][7], luminescent materials [8][9][10] and refractory materials [11]. However, the extremely high sintering temperature (1600°C) [12] makes it difficult to prepare BaZrO 3 ceramics under conventional experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sr²⁺doping on the microwave dielectric properties of BaZrO₃ceramics

Cui,

Shao

2023

Advances in Applied Ceramics: Structural, Functional and Biocer

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In this study, undoped and Sr 2+ doped BaZrO 3 ceramics were prepared by solid-state reaction using 3 wt-% B 2 O 3 as sintering aid. The phase composition and microstructure of BaZrO 3 were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that introducing an appropriate amount of Sr 2+ makes BaZrO 3 ceramics Q × f value and density increase. In addition, the dielectric constant of BaZrO 3 ceramics increases with the increase of Sr 2+ addition. With excellent microwave dielectric properties, ε r = 34.17 and Q × f value of 39,070 GHz(@ 7.8 GHz) τ f = + 140 ppm/°C were obtained in 6 at.-% Sr 2+ doped BaZrO 3 with 3 wt-% B 2 O 3 sintering aid at 1275°C for 5 h. Using this material as the medium, the simulation of GPS antenna by HFSS software shows that this material has the potential to be used as the antenna medium material.

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Correlation between local structure and electronic properties of BaZrO3:TbYb Optical Ceramics

Cited by 5 publications

References 55 publications

Technological Challenges and Advancement in Proton Conductors: A Review

Technological Challenges and Advancement in Proton Conductors: A Review

Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Effect of Sr²⁺doping on the microwave dielectric properties of BaZrO₃ceramics

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Correlation between local structure and electronic properties of BaZrO3:TbYb Optical Ceramics

Cited by 5 publications

References 55 publications

Technological Challenges and Advancement in Proton Conductors: A Review

Technological Challenges and Advancement in Proton Conductors: A Review

Chemical stability aspects of BaCe0.7–xFexZr0.2Y0.1O3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Effect of Sr2+doping on the microwave dielectric properties of BaZrO3ceramics

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Chemical stability aspects of BaCe_0.7–xFe_xZr_0.2Y_0.1O_3–δ mixed ionic-electronic conductors as promising electrodes for protonic ceramic fuel cells

Effect of Sr²⁺doping on the microwave dielectric properties of BaZrO₃ceramics