Crystallization in Na2O–Nb2O5–Al2O3–SiO2 glass–ceramics system with partial replacement of SnO2 for Al2O3

Kongputhon, Pornpis; Niyompan, Anuson; Tipakontitikul, Rungnapa

doi:10.1016/j.jcrysgro.2012.02.043

Cited by 9 publications

(6 citation statements)

References 20 publications

(15 reference statements)

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“…Further, as the temperature increases, the polar group contained in the ceramic compositions will be freer and able to follow the electric field changes, i.e., overall polarization increases and thus ε' increases. The temperature also lowers the viscosity of the glassy phase, which in turn allows the dipole and ions to respond easily to the external electric field, i.e., polarization increases [40]. The glassy phase content and crystallinity may also play a significant role in the electrical behavior of these ceramics.…”

Section: Comparison Studymentioning

confidence: 99%

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

Mahani

Omara

2022

Appl. Phys. A

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The dielectric relaxation and conduction mechanism of 40 wt% nepheline tailing and 60 wt% clay-based ceramic, i.e., the 40/60 ceramic, have been investigated over wide ranges of frequency and temperature, using a broadband dielectric spectrometer (BDS) and then compared with the data recently reported for the 50/50 ceramic. Both 40/60 and 50/50 ceramics were fabricated by grinding the raw materials to be very fine, wet homogenously mixing, drying and finally firing at 1200 °C. Their crystalline phases identified by X-ray diffraction were quartz, hematite, cristobalite, and albite. The 40/60 ceramic of lower glassy phase (nepheline tailing) content displays lower crystallinity than the 50/50 ceramic. Its conduction activation energies (Eac) show values between 0.12 and 0.32 eV, corresponding to the activation energy of oxygen vacancies (Vo++ ~ 0.22 eV). As oxygen vacancies migrate at relatively low operating voltages, the fabricated ceramics would be promising in manufacturing the random access memory (RAM), taking into consideration that the 50/50 ceramic is more useful than the 40/60 ceramic. As a result, nepheline tailing or the glassy phase component may generate more oxygen vacancies and thus enhance the ceramic electrical properties. Finally, the conduction mechanism of both ceramics is described via the correlated barrier hopping (CBH) model.

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Section: Comparison Studymentioning

confidence: 99%

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

Mahani

Omara

2022

Appl. Phys. A

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“…[11][12][13][14] Previous studies have shown that the dielectric strength and dielectric constant of ferroelectric crystallized glasses containing niobates are strongly dependent on the glass composition, crystal size, and crystalline phase. [15][16][17][18] Thus, controlled nucleation and crystal growth are required to manipulate these properties.…”

Section: Introductionmentioning

confidence: 99%

⁹³Nb NMR Study of (K, Na)NbO₃‐Doped SiO₂–Na₂O–Al₂O₃ Glasses

Otsuka

Cicconi

Dobesh

et al. 2022

Physica Status Solidi (b)

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Aluminosilicate glasses containing octahedral NbO6 units are developed for future applications as optical materials. Soda‐aluminosilicate glasses doped with Nb‐based alkaline perovskite crystals (K0.5Na0.5NbO3 [KNN]) at different doping levels (2–30 mol%) are studied by 93Nb nuclear magnetic resonance (NMR) spectroscopy. The Al2O3 concentration in the starting soda‐aluminosilicate glass matrix is varied from 5 to 17 mol% to investigate the influence of the composition of local Nb structures with 4–5, 6, and 7–8 fold‐oxygen coordination on the optical properties of the glasses. The chemical shifts are analyzed by comparison with the 93Nb NMR data of reference crystals, including KNN, to determine the feasibility of producing more NbO6 octahedra in the aluminosilicate glasses, where these octahedra are expected to promote the development of optically active Nb‐glass‐ceramics. The data show that both glass polymerization and KNN content influence the Nb local environment. Therefore, an appropriate amount of Al2O3 combined with an adequate doping level of the KNN perovskite is required to achieve the desired optical features. Contrary to expectations, a higher KNN doping level is achieved with the starting depolymerized soda‐aluminosilicate glass containing 5 mol% Al2O3, leading to perovskite‐like structures of NbO6 octahedra in the resultant glass system.

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“…Glass ceramic is a kind of crystal glass with a combination of solid materials after high temperature melting, forming, heat treatment. Glass ceramic is higher than the transparency of ceramic, strong toughness than glass, widely used in machinery manufacturing, electronics and microelectronics, aerospace, chemical, industry, biological medicine and construction industry, etc [1][2][3] . In the presented work, the main research direction of niobate glass ceramics is the use of its expansion coefficient and the coefficient of expansion of kovar alloy, high strength, chemical stability strong, high insulation resistance, etc [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Eu3+ Doped CaO-Nb2O5-SiO2 Glass-Ceramics

Song

Zhang

Zhu

et al. 2014

AMR

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The glass-ceramics containing nanocrystalline CaNb2O6phase in the 35%SiO2-25%Nb2O5-20%CaO-15BaO-5%Eu2O3(wt%) glass system were prepared by the melt-quench technique followed by a two-stage controlled heat treatment. Samples were characterized by differential thermal analysis, X-ray diffraction, scanning electron microscope, spectrophotometer and fluorescence spectrophotometer. The results shown that glass ceramic phase is CaNb2O6, grain size is about 30 nm, The two-stage controlled heat treatment is beneficial to control of the number and size of grains, thus affecting the transparency of glass ceramic and luminescence properties. The transmittance of the glass ceramics can be up to 80% in the near-infrared light area. The luminescence spectra of Eu3+-doped glass and glass–ceramics were recorded at 394 nm excitation wavelength and the luminescence intensity is found to be increased with heat-treatment time due to increase in crystallinity. Fluorescence spectrum showed 4 emission peak, which located in the 578 nm (5D0-7F0), 592 nm (5D0-7F1), 615 nm (5D0-7F2) and 654 nm (5D0-7F3), Eu3 +emission peak intensity in the glass ceramic sample were greater than the substrate glass.

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Crystallization in Na2O–Nb2O5–Al2O3–SiO2 glass–ceramics system with partial replacement of SnO2 for Al2O3

Cited by 9 publications

References 20 publications

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

⁹³Nb NMR Study of (K, Na)NbO₃‐Doped SiO₂–Na₂O–Al₂O₃ Glasses

Synthesis and Characterization of Eu<sup>3+</sup> Doped CaO-Nb<sub>2</sub>O<sub>5</sub>-SiO<sub>2</sub> Glass-Ceramics

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Crystallization in Na2O–Nb2O5–Al2O3–SiO2 glass–ceramics system with partial replacement of SnO2 for Al2O3

Cited by 9 publications

References 20 publications

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

Effect of clay/nepheline tailing ratio on the dielectric relaxation and conduction mechanism of the conventional ceramic

93Nb NMR Study of (K, Na)NbO3‐Doped SiO2–Na2O–Al2O3 Glasses

Synthesis and Characterization of Eu<sup>3+</sup> Doped CaO-Nb<sub>2</sub>O<sub>5</sub>-SiO<sub>2</sub> Glass-Ceramics

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⁹³Nb NMR Study of (K, Na)NbO₃‐Doped SiO₂–Na₂O–Al₂O₃ Glasses