Effect of SiO2/Al2O3 ratio on the structure and electrical properties of MgO–Al2O3–SiO2 glass-ceramics doped with TiO2

Li, Hao; Yin, Zheyi; Deng, Lei; Wang, Shuo; Fu, Zhe; Ma, Yonghong

doi:10.1016/j.matchemphys.2020.123653

Cited by 20 publications

(4 citation statements)

References 43 publications

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“…LAC has values of 0.17 to 0.2 cm -1 at an energy of 1 MeV for glasses TiBi-0.0 to TiBi-2.5, respectively. Glass TiBi-12 has the greatest LAC values due to its maximum atomic number and ρ (21) . Additionally, the figure shows that at these selected https://www.indjst.org/ energies, the Bi 2 O 3 concentration has a linear effect on the LAC.…”

Section: Resultsmentioning

confidence: 99%

Impact of Bi2O3 on the Structural, Optical, Radiation Shielding, and Dielectric Analysis of Lead Borosilicate Glasses Doped with TiO2

Krishna,

Guntu,

Chand

et al. 2024

IJST

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Objective: The principal aim of this investigation was to assess the impact of bismuth oxide on the optical properties, radiation shielding characteristics, and dielectric behavior of lead borosilicate glasses doped with titanium oxide at a low concentration. Method: We intended to utilize the conventional rapid melt quenching method to produce glasses with the following chemical composition: 25 PbO+ 15 B2O3 + 0.1 TiO2 + (59.9-x) SiO2 : x Bi2O3(0≤x≤12). Findings: XRD and SEM analyses were used to confirm the samples' non-crystalline properties, while DTA investigations were used to evaluate the samples' ability to form glass. The numerous structural elements were identified through the utilization of FT–IR and Raman analyses. The optical characteristics of glasses are determined by optical absorption studies. The findings derived from optical absorption spectral analyses revealed a progressive increase in the concentration of octahedral Ti4+ ions with the mol% Bi2O3 concentration. In order to analyse the glasses' dielectric properties, an impudence analyser was employed. The results obtained from these inquiries indicate that glasses do contain Bi2O3 at concentrations lower than 12 mol% experience a progressive increase in dielectric constant values. Further investigation is conducted into the radiation shielding properties of the glasses. Novelty: The findings indicate that the values of the glasses' optical band gap, radiation shielding ability, dielectric constant, and thermal stability are all directly correlated with their Bi2O3 concentration. Keywords: FTIR, Raman, OBG, MAC, Activation Energy

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Section: Resultsmentioning

confidence: 99%

Impact of Bi2O3 on the Structural, Optical, Radiation Shielding, and Dielectric Analysis of Lead Borosilicate Glasses Doped with TiO2

Krishna,

Guntu,

Chand

et al. 2024

IJST

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“…As the percentage of silicon in the substrate increases, the possibility and amount of silicon oxide formation also increase. The formation of SiO 2 in the coating reduces the dielectric constant and results in a decrease in the coating's resistivity, thus leading to a reduction in strong micro-discharges [53]. Moreover, the surface roughness increased with the increasing thickness of the coatings, since with an increasing thickness, more power is needed for the current to transit across the oxide layer.…”

Section: The Surface Roughness and Thickness Of The Coatingsmentioning

confidence: 99%

Systematic Investigation of Silicon Content Effects on the PEO Coatings’ Properties on Al–Si Binary Alloys in Silicate-Based and Tungstate-Containing Electrolytes

2022

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The present study evaluates the effect of a substrate’s silicon content on the coatings’ morphology, structure, and properties in an electrolyte containing sodium tungstate on Al–xSi alloys. The PEO-coated samples demonstrated the structure of the pancake and crater with irregular micro-cracks and micro-pores. The incorporation of the element W in the coatings decreased the surface roughness and porosity due to increasing the electrolyte conductivity and, hence, decreasing the breakdown voltage and intensity of micro-discharges. The friction coefficient of all the coatings stayed constant during the wear test due to the contact of the ball with the inner layer with less porosity and higher micro-hardness. The track depth to the thickness ratio of the coatings was found to be 0.60–0.75 for those without additive coatings and 0.55–0.65 for those with additive coatings. As a result, the higher wear rates, volume losses, track widths, and depths in the specimens with a lower silicon content of the substrate were found due to the greater thickness of the coating and the outer sublayer for both specimens with and without Na2WO4. The coatings formed using the W-containing electrolyte showed a higher micro-hardness and a lower wear rate in comparison with the coatings produced in the silicate-based electrolyte.

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“…In addition, the nucleating agents, TiO 2 + ZrO 2, can promote the precipitation of cordierite and reinforce the stability of the glass, resulting in the best mechanical performance of the glass-ceramics [21]. Li et al studied the effect of the SiO 2 /Al 2 O 3 ratio on the properties of the MAS glass-ceramics and observed that an increase in the SiO 2 /Al 2 O 3 ratio increased the average thermal expansion coefficient but decreased the density and grain refinement, and the sample of MAS glass-ceramics exhibited the best dielectric properties with a dielectric constant of 8.78 (1 MHz) and a dielectric loss of 3.55 × 10 -3 (1 MHz) when the SiO 2 /Al 2 O 3 ratio was 1.27 [28]. Wu et al studied the effect of the MgO/Al 2 O 3 ratio on the crystallisation and thermal expansion coefficient of the MAS glass-ceramics; they found that the strongest crystallisation was achieved when the MgO/Al 2 O 3 ratio was close to 1:1 [29].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of MgO-Al2O3-SiO2 Glass–Ceramics with Controllable Crystalline Phases

Zhang

Huang²,

Guo

et al. 2023

Crystals

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MgO–Al2O3–SiO2 (MAS) glass–ceramics with controllable crystalline phases were successfully prepared using the melting method followed by heat treatment. The effects of the main components of glass on the crystallisation kinetics, nucleation, crystallisation and properties of glass–ceramics were investigated in detail. As the Al2O3 and MgO contents increase and SiO2 content decreases, the crystallisation peak temperature and activation energy of MAS glass decrease, while the crystal growth tends to follow a homogeneous nucleation crystallisation. The MAS glass nucleation temperature and time increase with higher concentrations of Al2O3 and MgO and with a lower SiO2 concentration. Mg2(Al4Si5O18) indialite and MgAl2O4 spinel precipitate simultaneously in the MAS glass after crystallisation; the relative proportion of crystalline phases is related to the composition and crystallisation temperature. A higher SiO2 content allows the formation of a dominant indialite phase, while higher MgO and Al2O3 contents promote the formation of a dominant spinel phase. The MAS glass ceramic with a greater indialite phase has good dielectric properties with a dielectric constant of 6.499 and dielectric loss of 0.0064, while that of a higher spinel phase possesses improved mechanical properties, with a Vickers hardness of 715 Hv and a bending strength of 244.9 MPa.

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Effect of SiO2/Al2O3 ratio on the structure and electrical properties of MgO–Al2O3–SiO2 glass-ceramics doped with TiO2

Cited by 20 publications

References 43 publications

Impact of Bi2O3 on the Structural, Optical, Radiation Shielding, and Dielectric Analysis of Lead Borosilicate Glasses Doped with TiO2

Impact of Bi2O3 on the Structural, Optical, Radiation Shielding, and Dielectric Analysis of Lead Borosilicate Glasses Doped with TiO2

Systematic Investigation of Silicon Content Effects on the PEO Coatings’ Properties on Al–Si Binary Alloys in Silicate-Based and Tungstate-Containing Electrolytes

Preparation and Properties of MgO-Al2O3-SiO2 Glass–Ceramics with Controllable Crystalline Phases

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