Synthesis, characterisation and kinetic study of a glassy material in the BaO–TiO2–Ta2O5–B2O3–Al2O3 system obtained by a traditional glass fusion–casting method

Sanchez-Vazquez, Astrid Iriana; Ruiz-Valdés, J.J.; Ramírez-Blanco, E.; Méndez, Anabel Álvarez; Arciniega, S.M. De la Parra

doi:10.1016/j.jnoncrysol.2013.09.005

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…These limitations should be circumvented using the melt‐quenching method from oxide precursors but both silica and transition‐metal oxides of interest are highly refractory, hindering the preparation of these binary systems under convenient melting temperatures. Only a few works report the obtaining of tantalum containing glasses in other glass formers such as phosphate, borate, or tellurite hosts and its influence on thermal and physical properties . In most cases, tantalum oxide is not a major constituent of the glass composition and is added in small contents to improve thermal and optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few works report the obtaining of tantalum containing glasses in other glass formers such as phosphate, borate, or tellurite hosts and its influence on thermal and physical properties. [15][16][17][18][19][20] In most cases, tantalum oxide is not a major constituent of the glass composition and is added in small contents to improve thermal and optical properties. To our knowledge, there are no reports of germanate glasses containing significative amounts of Ta 2 O 5 (>10 mol%).…”

Section: Introductionmentioning

confidence: 99%

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Thermal, Structural, and Crystallization Properties of New Tantalum Alkali‐Germanate Glasses

et al. 2015

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In this work, new glass compositions were prepared in the ternary system GeO 2 -K 2 O-Ta 2 O 5 . Potassium oxide was added to reach the complete melt of the starting mixture and two composition series were investigated: the first one with a constant K 2 O molar content of 10% in the ternary system (90-x) GeO 2 -10K 2 O-xTa 2 O 5 and the second one with the same molar content of K 2 O and Ta 2 O 5 in the ternary system (100-2x)GeO 2 -xK 2 O-xTa 2 O 5 . Homogeneous and transparent glasses could be obtained between x = 0 and 20. X-ray diffraction analyzes of samples with x = 25 identified orthorhombic Ta 2 O 5 in the first series and an isostructure of K 3.8 Ge 3 Nb 5 O 20.4 in the second series where it is assumed that Ta 5+ ions are inserted in the Nb 5+ sites. As one of our goal with these materials is related with the preparation of glass-ceramics containing Ta 2 O 5 nanocrystals, the first series has been selected for further characterizations. An increase in glass-transition temperatures with increasing Ta 2 O 5 content as well as an increase of the thermal stability from x = 0 to 10 has been identified by differential scanning calorimetry. For higher contents, crystallization events were identified. Fourier transform infrared and Raman spectroscopic characterizations allowed to point out the intermediary behavior of Ta 2 O 5 in the vitreous network where TaO 6 octahedra are inserted inside the germanate network with TaO 6 clusters identified at higher Ta 2 O 5 contents. Heat-treated samples with high tantalum contents (x = 15 and 20) exhibit preferential precipitation of orthorhombic Ta 2 O 5 with nanometric size, suggesting the possibility of obtaining transparent glassceramics for optical applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal, Structural, and Crystallization Properties of New Tantalum Alkali‐Germanate Glasses

et al. 2015

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“…Hexacelsian has a high thermal expansion coefficient required for SOFC applications, while monocelsian has a very low thermal expansion coefficient. For some compositions, silica (quartz or cristobalite) can also be formed [15,27]. Cristobalite is particularly problematic because of the displacement transformations on cooling with a related reduction of volume, which can lead to cracking.…”

Section: Rigid Bonded Sealantmentioning

confidence: 99%

Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Gunawan

Sulistyo

Setyawan³

2021

ARFMTS

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Solid oxide fuel cells (SOFCs) have emerged as promising energy conversion devices nowadays. SOFC consists of several components such as cathode, anode, electrolyte, interconnects, and sealing materials. In planar SOFC stack construction, the sealant and interconnection functions play an important role. Glass and ceramics are quite popularly used as SOFC sealing materials to achieve several functions including preventing leakage of fuel and oxidants in the stack and electrically isolating cells in the stack. In this review, material preparation, material composition, ceramic properties especially thermal properties are compared from various systems that have been developed previously. The main challenges and complexities in the functional part of SOFC sealants include: (i) chemical incompatibility and instability in the oxidizing and reducing environment by adjusting the value of the thermal expansion coefficient (CTE) with the interconnecting material during SOFC operation, and (ii) insulation of oxidizing fuels and gases by matching CTE anode and cathode. Also, the sealant glass transition determines the maximum permissible working temperature of the SOFC. The choice of method and analysis will provide data on various ceramic attributes. The search for thermal attributes consisting of Glass transition (Tg), Deformation temp (Td), Crystallization temp (Tx), Melting pt (Tm) became a focus on SOFC sealant development.

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“…The elemental compositions of the fly ash vary according to the type of coal, the degree of pulverization, and the type of collectors used, even when the fly ash is obtained from the same source [3]. Previous studies have shown that the fly ash generated by Boyacá industry is classified as F class, in accordance with X-ray fluorescence analysis and ASTM C 618 Standard specifications [4,5,6]. On the other hand, slag forms from the fusion of mineral impurities added during steel production, and its extraction occurs at 1400 °C, generating glassy products rich in CaO, SiO 2 , MgO, MnO, and Fe 2 O 3 [7,8].…”

Section: Introductionmentioning

confidence: 98%

Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents

et al. 2019

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Developments in the field of materials science are contributing to providing solutions for the recycling of industrial residues to develop new materials. Such approaches generate new products and provide optimal alternatives to the final disposal of different types of industrial wastes. This research focused on identifying and characterizing slag, fly ash, and glass cullet from the Boyacá region in Colombia as raw materials for producing glass-ceramics, with the innovative aspect of the use of these three residues without the addition of nucleating agents to produce the glass-ceramics. To characterize the starting materials, X-ray diffraction (XRD), X-ray fluorescence (XRF), and Scanning Electron Microscopy (SEM) techniques were used. The results were used to evaluate the best conditions to produce mixtures of the three waste components and to determine the specific compositions of glass-ceramics to achieve products with attractive technical properties for potential industrial applications. The proposed mixtures were based on three compositions: Mixture 1, 2, and 3. The materials were obtained through thermal treatment at 1200 °C in a tubular furnace in accordance with the results of a comprehensive characterization using thermal analysis. The microstructure, thermal stability, and structural characteristics of the samples were examined through SEM, differential thermal analysis (DTA), and XRD analyses, which showed that the main crystalline phases were diopside and anorthite, with a small amount of enstatite and gehlenite. The obtained glass-ceramics showed properties of technical significance for structural applications.

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Synthesis, characterisation and kinetic study of a glassy material in the BaO–TiO2–Ta2O5–B2O3–Al2O3 system obtained by a traditional glass fusion–casting method

Cited by 6 publications

References 16 publications

Thermal, Structural, and Crystallization Properties of New Tantalum Alkali‐Germanate Glasses

Thermal, Structural, and Crystallization Properties of New Tantalum Alkali‐Germanate Glasses

Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Development and Characterization of Glass-Ceramics from Combinations of Slag, Fly Ash, and Glass Cullet without Adding Nucleating Agents

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