Synthesis and characterization of (Bi2O3)1−−−(Gd2O3) (Sm2O3) (Eu2O3) quaternary solid solutions for solid oxide fuel cell

Matmon, Ari; Balcı, Murat; Polat, Yasin

doi:10.1016/j.cjph.2018.10.001

Cited by 11 publications

(3 citation statements)

References 43 publications

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“…According to results obtained from this study, they achieved to stabilize cubic δ-phase at all temperatures and they found that the ion conductivity was 0.57 S.cm -1 at 700 °C, which was the highest ion conductivity among all binary systems studied in the literature. Similarly, Yılmaz et al's also studied double-doped system in which they used Dy and Yb as dopants and they found that the conductivity was quite close to Wachsman's results with 0.51 S/cm for 14Yb10DSB mixture at 800 °C, although they exceeded 12% total doping rate suggested by Wachsman et al for double-doped systems [20][21].…”

Section: Introductionmentioning

confidence: 54%

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

Balcı

Matmon

Polat

2021

Preprint

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In this study, the effects of multi-doping strategy on phase stabilization and electrical conductivity for the doped Bi 2 O 3 system were investigated. All solid mixtures were created by solid state reactions according to a certain stoichiometric ratio in atmospheric conditions. The structural, electrical, thermal and surface characterizations of the created samples were performed by x-ray diffraction method (XRD), four point-probe technique (4-PPT), differential thermal analysis/thermo gravimetric analysis (DTA/TGA) and scanning electron microscope (SEM), respectively. From XRD results, it was seen that the fcc δ-phase could be stabilized by using only 1:1:1:2 or 2:2:2:1 dopant content ratio (in here, “1:” is corresponds to” 5%” mole). The other compounds prepared out of this ratios were mixed phase because of the containing both α-phase peaks and δ-phase peaks on their XRD pattern. When the all samples were compared in terms of electrical conductivity at 750 °C, it was observed that the fcc δ-phase stabilized samples exhibited higher conductivity than that of other compounds as expected. The highest electrical conductivity was for the sample, dopant content ratios of which are 1: 1: 1: 2, with 0.014 S.cm -1 at 750 °C and also it had the lowest activation energy (0.51 eV) among all samples. On the other hand, according to the thermal analysis results, it was concluded that phase transition occurred only on the DTA curve of the sample given with dopant content ratios 1:1:1:1 due to presence of endothermic peak on its DTA curve at 729°C during the heating process. Also, for this sample, it was clearly predicted from the electrical conductivity graphs depending on temperature that the phase transition occurred at just that temperature (729 °C) due to the sudden increase in conductivity by indicating phase transition from the α-phase to the cubic δ-phase. The SEM analysis pointed out that grain size decreased as total dopant ratio increased and also the grain boundary changed sharply with the increase in the total dopant ratio.

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Section: Introductionmentioning

confidence: 54%

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

Balcı

Matmon

Polat

2021

Preprint

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“…Ytterbium-stable Zirconia (YSZ) type solid electrolytes are commonly used in today's SOFC units due to their structural and thermal resilience at high temperatures. [7,8]. However, the electrical conductivity of YSZ decreases significantly at low operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Tb–Er Co–Doped Bi2O3 Solid Electrolyte Systems

BALCI

2023

Cumhuriyet Science Journal

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In this study, solid state reactions were used to create Er–Tb co–doped Bi2O3 solid electrolyte systems. Four Point Tip Technique (FPPT), Thermo–gravimetric and Differential Thermal Analysis (TG & DTA), and X–Ray Diffraction (XRD) were used to characterize the generated samples' structural and thermal properties, and electrical conductivity. The samples 05Er05TbSB, 05Er10TbSB, and 15Er05TbSB stabilized with cubic δ–phase at room temperature, according to XRD data. Due to the smaller dopants ions compared to the host Bi3+ cation, the lattice constants estimated for these samples were lower than those of the pure cubic phase. The samples were thought to be thermally stable in the studied temperature range since the thermal curves did not show endothermic or exothermic peak development indicating a potential phase change. According to the Arrhenius equation, the temperature–dependent conductivity graphs displayed a linear change. The conductivity measurements clearly indicated that an increase in doping rate results in a sudden drop in electrical conductivity. The calculated activation energies increased with the doping ratio and varied from 0.64 eV to 1.12 eV. At 700 °C, it was determined to be 0.128 S.cm–1 for the sample 05Er05TbSB, which had the greatest conductivity and lowest activation energy among all samples. The conductivity was discovered to decrease and activation energy to increase when the doping ratio was gradually raised.

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“…[25] However few compositions with quaternary systems have been studied. [26][27][28] Despite the number of research articles on quaternary compositions, up to this date, the Sc 3þ contribution on Bi 2 O 3 is still unknown because this cation in the ZrO 2 cubic structure increases the ionic conductivity. [29] As Bi 2 O 3 has the same fluorite symmetry, it is expected an increase in the transport properties at intermediate temperatures.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

Ramirez-Dela Cruz,

Bocanegra-Bernal,

Márquez-Torres

et al. 2024

Physica Status Solidi (a)

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Quaternary compositions of polycrystalline Bi1.74Dy0.14W0.12−xScxO3 (x = 0.02, 0.03, 0.04, 0.05, 0.06) solid solutions are synthesized by the solid‐state reaction method. The 4a site symmetry of the space group occupied by Sc3+ ion retains the cubic fluorite‐type over a wide temperature range (450–700 °C) for low Sc3+ content without losing the δ‐phase. Dielectric and ionic conductivity by complex impedance in the frequency range from 0.1 to 100 kHz suggests a temperature‐ and Sc3+‐dependent relaxation process. The ionic conductivity increases with the Sc3+ content over the whole tested temperature range. An oxygen ion conductivity of 0.102 Scm−1 at 700 °C and an activation energy of 0.32 eV are achieved for x = 0.06. Optical properties and Rietveld refinement indicate a bandgap reduction due to a bond length reduction (Bi—O). These materials have potential in photocatalysis and water‐splitting technology due to their UV and visible region absorption capabilities.

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Synthesis and characterization of (Bi2O3)1−−−(Gd2O3) (Sm2O3) (Eu2O3) quaternary solid solutions for solid oxide fuel cell

Cited by 11 publications

References 43 publications

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

Synthesis and Characterization of Tb–Er Co–Doped Bi2O3 Solid Electrolyte Systems

Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions

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Synthesis and characterization of (Bi2O3)1−−−(Gd2O3) (Sm2O3) (Eu2O3) quaternary solid solutions for solid oxide fuel cell

Cited by 11 publications

References 43 publications

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

The Effect of the Multi-doping Strategy on Stabilization of the Cubic δ-phase in the Bi2O3-based Solid Electrolyte Systems in Terms of the SOFC Applications

Synthesis and Characterization of Tb–Er Co–Doped Bi2O3 Solid Electrolyte Systems

Dielectric and Optical Properties of δ‐Bi2O3 Quaternary Semiconducting Solid Solutions

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Dielectric and Optical Properties of δ‐Bi₂O₃ Quaternary Semiconducting Solid Solutions