Correlation of microstructure and electrical conduction behaviour with defect structure of niobium doped barium stannate

Singh, Prabhakar; Sebastian, C. Peter; Kumar, Devendra

doi:10.1016/j.jallcom.2006.07.122

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…It was found that the grain size for pristine BFO sample (4e5 mm) is significantly higher than that of Sm 3þ ion doped BFO samples (1e2 mm). This suggests that the Sm 3þ substitution in BFO inhibits the grain growth and leads to smaller grain size, also supported by earlier reported work [26]. The presence of two types of grains in BSFO-830 indicates presence of two phases in the sintered ceramic.…”

Section: Resultssupporting

confidence: 82%

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Sharma

Satapathy

Varshney

et al. 2015

Materials Chemistry and Physics

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Section: Resultssupporting

confidence: 82%

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Sharma

Satapathy

Varshney

et al. 2015

Materials Chemistry and Physics

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“…Singh et al. in BaSn 1– x Nb x O 3 proposed that similarly to barium titanate, for x > 0.010 B-site vacancies form . Alternatively, barium vacancies formation and reduction of titanium from Ti 4+ to Ti 3+ were considered by Jwala et al.…”

mentioning

confidence: 99%

Novel Class of Proton Conducting Materials—High Entropy Oxides

Gazda

Miruszewski

Jaworski

et al. 2020

ACS Materials Lett.

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Here, for the first time, we present data on proton conductivity of high-entropy, single-phase perovskites. The BaZr0.2Sn0.2Ti0.2Hf0.2Ce0.2O3−δ, BaZr0.2Sn0.2Ti0.2Hf0.2Y0.2O3−δ, BaZr1/7Sn1/7Ti1/7Hf1/7Ce1/7Nb1/7Y1/7O3−δ, and BaZr0.15Sn0.15Ti0.15Hf0.15Ce0.15Nb0.15Y0.10O3−δ single-phase perovskites were synthesized. Before electrical measurements, materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The following experimental results demonstrated that studied high-entropy perovskites are proton conductors: (1) The observed mass increase upon the switch from dry to wet atmosphere confirmed the water incorporation into materials structure. (2) The electrochemical impedance spectroscopy (EIS) revealed that the total conductivity increased while its activation energy decreased in the presence of water vapor in the atmosphere. (3) The conductivity in atmosphere humidified with H2O and D2O differed one from another, showing typical of proton conductors isotope effect in high-entropy oxides.

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“…It has been observed from table 1 that the value of crystallite size has decreased with Nb substitution. The decrease in crystallite size can be correlated with the smaller ionic radii of Nb as well as their grain growthinhibiting properties [34].…”

Section: Crystallite Size and Micro-strain Determinationmentioning

confidence: 99%

Role of charge-compensation process on the structural, microstructure and electrical properties of pure and Nb-doped Sr₂SnO₄

Jatiya,

Yadav,

Singh

et al. 2024

Nano Ex.

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This article explores the charge compensation method by synthesising Sr2SnO4, Sr2Sn0.99Nb0.01O4, and Sr1.995Sn0.99Nb0.01O4. The synthesis of a monophasic, tetragonal sample was achieved using a typical ceramic approach and high-temperature heat treatment. The XRD followed by Rietveld refinement, confirmed the crystallization of material under the space group I4/mmm. The crystallite sizes for all samples determined to be less than 50 nm, while the micro-strain falls within the range of (1.78-2.93)x10-3. The microstructure exhibits a cuboidal shape for all samples, and the grain size is observed to decrease with the addition of Nb. The dielectric characteristics of the samples indicate the existence of Maxwell-Wagner and Orientational polarization in the sample. The sample Sr2Sn0.99Nb0.01O4 demonstrates a greater conductivity value compared to Sr1.995Sn0.99Nb0.01O4. This is attributed to the presence of excess electrons that compensate for the overall charge, as opposed to Sr1.995Sn0.99Nb0.01O4 where the extra charge is compensated by a cationic vacancy V_Sr^''. The time-temperature-superposition principle (TTSP) is applicable to all compositions and indicates that similar sources are responsible for both conduction and relaxation processes. The dielectric permittivity and dissipation factor are found to be in the range of 150 to 175 and 0.2 to 0.5, respectively. This suggests that they have potential for future use in millimeter-wave communication with dielectric resonator antennas (DRAs). Due to the presence of oxygen ions and the ability to conduct both ions and electrons, at temperatures above 400℃, it is a suitable choice for electrode materials in the application of intermediate temperature solid oxide fuel cell (IT-SOFCs). Exploring the manipulation of defects using electrical and ionic charge compensation methods shows potential for enhancing materials in semiconductor technology.

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Correlation of microstructure and electrical conduction behaviour with defect structure of niobium doped barium stannate

Cited by 12 publications

References 25 publications

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Novel Class of Proton Conducting Materials—High Entropy Oxides

Role of charge-compensation process on the structural, microstructure and electrical properties of pure and Nb-doped Sr₂SnO₄

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Correlation of microstructure and electrical conduction behaviour with defect structure of niobium doped barium stannate

Cited by 12 publications

References 25 publications

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Effect of sintering temperature on structure and multiferroic properties of Bi0.825Sm0.175FeO3 ceramics

Novel Class of Proton Conducting Materials—High Entropy Oxides

Role of charge-compensation process on the structural, microstructure and electrical properties of pure and Nb-doped Sr2SnO4

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Role of charge-compensation process on the structural, microstructure and electrical properties of pure and Nb-doped Sr₂SnO₄