Electrical conduction and dielectric properties of lithium aluminum silicate glasses doped with Cr3+ ions

Abdel-Wahab, F.A.; Abdel-Baki, Manal

doi:10.1016/j.jnoncrysol.2009.07.028

Cited by 36 publications

(3 citation statements)

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“…added elements, would dominate the dielectric constant properties due to their small size and light weight, resulting in high mobility [28][29][30]. Therefore, the LAS sample with the largest Li content among the glass samples exhibited the largest dielectric constant of 7.5.…”

Section: Resultsmentioning

confidence: 99%

“…When a high-frequency alternating electric field was applied to the LAS glass, ion polarization was the main mechanism, causing the ions in the network to react and migrate. Thus, it was expected that Li + ions, which have the smallest ionic radius and atomic weight among the added elements, would dominate the dielectric constant properties due to their small size and light weight, resulting in high mobility [ 28 , 29 , 30 ]. Therefore, the LAS sample with the largest Li content among the glass samples exhibited the largest dielectric constant of 7.5.…”

Section: Resultsmentioning

confidence: 99%

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Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

Kim¹,

Lee²,

Jun³

et al. 2023

Materials

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To develop plasma-resistant glass materials suitable for semiconductor etching processes, we introduced alkaline earth oxides (ROs) into a Li2O–Al2O3–SiO2 (LAS) glass. Analysis of glass properties with respect to the additives revealed that among the analyzed materials, the LAS material in which Li2O was partially replaced by MgO (MLAS) exhibited the most favorable characteristics, including a low dielectric constant (6.3) and thermal expansion coefficient (2.302 × 10−6/°C). The high performance of MLAS is attributed to the high ionic field strength of Mg2+ ions, which restricts the movement of Li+ ions under the influence of electric fields and thermal vibrations at elevated temperatures. When exposed to CF4/O2/Ar plasma, the etching speed of RO-doped glasses decreased compared with that of quartz and LAS glass, primarily owing to the generation of a high-sublimation-point fluoride layer on the surface. Herein, MLAS demonstrated the slowest etching speed, indicating exceptional plasma resistance. X-ray photoelectron spectroscopy analysis conducted immediately after plasma etching revealed that the oxidation-to-fluorination ratio of Li was the lowest for MLAS. This observation suggests that the presence of Mg2+ ions in the plasma discharge inhibits the migration of Li+ ions toward the surface, thereby contributing to the excellent plasma resistance of MLAS.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

Kim¹,

Lee²,

Jun³

et al. 2023

Materials

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“…It is well reported the carrier transport properties of most materials could be investigated by measuring their ac and dc electrical conductivities (σac and σdc). The two types of conductivity are well related to each other through the Jonscher empirical relation (σ(ω,T) = σac + σdc ) , where ω is the angular frequency of the applied alternating electric field [53]. The onset frequency from which σac starts to rise increases with decreasing the capacitive reactance (Xc= Zi = 1/2πfC).…”

Section: Impedance Studymentioning

confidence: 99%

<strong>From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO<sub>3</sub> Polymer electrolyte Mediated by Titanium Dioxide Filler</strong>

Aziz

Karim

Ghareeb

2018

Proceedings of 1st International Online Conference on Nanomaterials

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Synthesis of silver ion conducting polymer composites and its optical, electrical and morphological properties were conducted. In the study various amounts of titanium dioxide (TiO2) was added to the chitosan:silver nitrate (CS:AgNt) system. The appearance of SPR peak for CS:AgNt system and CS:AgNt doped with 1 wt.% TiO2 and disappearance of SPR peak for the system incorporated with 5 wt.% TiO2 reveals the formation of silver particle from nano scales to bulk metallic sizes. The optical microscope images reveal the formation of silver particles with bulk metallic sizes at 5 wt.% TiO2 filler. The SEM images show silver particles with small sizes for CS:AgNt and CS:AgNt incorporated with 1 wt.% TiO2. To make sure the reduction process of silver ions to metallic silver particles the impedance spectroscopy has been carried out. The decrease of dielectric constant and DC conductivity at high TiO2 concentration was correlated with the results of UV-vis and morphological achievments. Shifting of tanδ loss peak towards the lower frequency side at 5 wt.% TiO2 is an evident for the decrease in conductivity. The results of the present work reveals that silver ion conducting polymer electrolytes mediated by TiO2 filler are not suitable for electrochemical device application. Distinct peaks become visible in Mi spectra whereas no peaks can be seen in dielectric loss spectra.

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Impact of Cr³⁺/Mo⁶⁺/W⁶⁺ Doping on Dipolar Relaxation and AC Conductivity in Li₂O–Al₂O₃–SiO₂ Glasses

Vijaya Krishna,

Pavić,

Bafti

et al. 2024

Physica Status Solidi (a)

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In this investigation, results of dielectric features of Li2O–Al2O3–SiO2 (LAS) glass doped with 3.0 mol% of Cr2O3, MoO3, and WO3 are presented. The investigation spans broad regions of frequency (ω) 10−2–106 Hz and temperature (T) 20–240 °C. Initial characterization of the samples by means of optical absorption spectra reveals that Cr ions do persist in Cr3+oxidation state, whereas fractions of Mo and W ions do present in Mo5+ and W5+ states in addition to predominant presence Mo6+ and W6 + ions, respectively. Infrared spectra suggest that Mo5+ and W5+ ions involve in modifying the network of the glass and induced structural disorder. Dielectric parameters and also σac are observed to be the largest for 40Li2O–5Al2O3–52SiO2:3.0 MoO3 (LASMo) glass followed by 40Li2O–5Al2O3–52SiO2:3.0 WO3 (LASW) and 40Li2O–5Al2O3–52SiO2:3.0 Cr2O3 (LASCr) glasses. Analysis of dipolar relaxation phenomena are carried out using Cole–Cole plots. Analysis of the results of σac suggests that polaronic conduction due to electron transfer between Mo5+ ↔ Mo6+ and W5+ ↔ W6+ is prevailed in case of LASMo and LASW glasses and these glasses are predicted to be useful as cathodes, whereas in LASCr glass, ionic conductivity is dominant and is suitable for electrolytes in ionic batteries.

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Electrical conduction and dielectric properties of lithium aluminum silicate glasses doped with Cr3+ ions

Cited by 36 publications

References 31 publications

Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

<strong>From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO<sub>3</sub> Polymer electrolyte Mediated by Titanium Dioxide Filler</strong>

Impact of Cr³⁺/Mo⁶⁺/W⁶⁺ Doping on Dipolar Relaxation and AC Conductivity in Li₂O–Al₂O₃–SiO₂ Glasses

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Electrical conduction and dielectric properties of lithium aluminum silicate glasses doped with Cr3+ ions

Cited by 36 publications

References 31 publications

Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

Enhancing the Plasma-Resistance Properties of Li2O–Al2O3–SiO2 Glasses for the Semiconductor Etch Process via Alkaline Earth Oxide Incorporation

<strong>From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO<sub>3</sub> Polymer electrolyte Mediated by Titanium Dioxide Filler</strong>

Impact of Cr3+/Mo6+/W6+ Doping on Dipolar Relaxation and AC Conductivity in Li2O–Al2O3–SiO2 Glasses

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Impact of Cr³⁺/Mo⁶⁺/W⁶⁺ Doping on Dipolar Relaxation and AC Conductivity in Li₂O–Al₂O₃–SiO₂ Glasses