Structural, thermal and optical characterization of co-existing glass and anti-glass phases of xLa2O3-(100-x)TeO2 and 2TiO2-xLa2O3-(98-x)TeO2 systems

Kaur, Rajinder; Khanna, Atul; González-Barriuso, Marina; González, F.

doi:10.1016/j.jnoncrysol.2020.120117

Cited by 11 publications

(3 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, there is no report aimed to identify the accurate structure and symmetry of this particular phase, which aids in modifying the optical properties of the material. It is precisely stated that the Eu 3+ ion can serve as a spectral probe by assisting in understanding the local structure in its vicinity right from crystals to glass or GCs since both its absorption and emission electric-dipole transitions are very sensitive to its local environment. − When Eu 3+ is present in a glass or a GC system, the interactions between the free energy level of Eu 3+ and its surrounding ligand field perturbs the degenerate energy levels differently, leading to signature Stark level splitting in electric-dipole ( 5 D 0 → 7 F 2 ) and magnetic-dipole ( 5 D 0 → 7 F 1 ) transitions in emission spectra. − The R change parameter [where R change = | R GC – R G |/ R G , R G and R GC are the R -values (integrated relative intensity ratio of the ( 5 D 0 → 7 F 2 )/( 5 D 0 → 7 F 1 ) transition in glass and GCs, respectively)] helps to understand the local environment change after ceramization . Therefore, a detailed study on Eu 3+ photoluminescence and absorption spectra reveals the change in the local environment around the Eu 3+ during the transformation of glass into GCs.…”

Section: Introductionmentioning

confidence: 99%

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

et al. 2022

View full text Add to dashboard Cite

The presence of lanthanide-tellurite “anti-glass” nanocrystalline phases not only affects the transparency in glass–ceramics (GCs) but also influences the emission of a dopant ion. Therefore, a methodical understanding of the crystal growth mechanism and local site symmetry of doped luminescent ions when embedded into the precipitated “anti-glass” phase is crucial, which unfolds the practical applications of GCs. Here, we examined the Ln2Te6O15 “anti-glass” nanocrystalline phase growth mechanism and local site symmetry of Eu3+ ions in transparent GCs produced from 80TeO2–10TiO2–(5 – x)La2O3–5Gd2O3–xEu2O3 glasses, where x = 0, 1, 2. A crystallization kinetics study identifies a unique crystal growth mechanism via a constrained nucleation rate. The extent of “anti-glass” phase precipitation and its growth in GCs with respect to heat-treatment duration is demonstrated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) analysis. Qualitative analysis of XRD confirms the precipitation of both La2Te6O15 and Gd2Te6O15 nanocrystalline phases. Rietveld refinement of powder X-ray diffraction patterns reveals that Eu3+ ions occupy “Gd” sites in Gd2Te6O15 over “La” sites in La2Te6O15. Raman spectroscopy reveals the conversion of TeO3 units to TeO4 units with Eu2O3 addition. This confirms the polymerizing role of Eu2O3 and consequently high crystallization tenacity with increasing Eu2O3 concentration. The measured Eu3+ ion photoluminescence spectra revealed its local site symmetry. Moreover, the present GCs showed adequate thermal cycling stability (∼50% at 423 K) with the highest activation energy of around 0.3 eV and further suggested that the present transparent GCs would be a potential candidate for the fabrication of red-light-emitting diodes (LEDs) or red component phosphor in W-LEDs.

show abstract

Section: Introductionmentioning

confidence: 99%

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The thermal stability can be indicated by the temperature difference ΔT =Tx-Tg, where Tx is the crystallization onset temperature and Tg is the glass transition temperature [18] . ΔT measures the resistance of the glass phase to crystallization during heat treatment [19] . The DTA curves of GLT 1-5 glasses are shown in Fig.…”

Section: Thermal Propertymentioning

confidence: 99%

Structural, Thermal, and Optical Properties of GeO₂-La₂O₃-TiO₂ Glasses

Jiabao¹,

Minghui²,

Huaiyu³

et al. 2023

Journal of Inorganic Materials

View full text Add to dashboard Cite

La2O3-TiO2 glasses show promising application prospect in fields of lenses, optical windows, and optical communication, owing to high refractive index and excellent performance. However, this glass cannot be prepared into large size because of its weak glass forming ability. This seriously limits the application of this new glass. In this study, introducing the network former GeO2, the glass forming ability can be effectively improved. This enables large-sized GeO2-La2O3-TiO2 (GLT) glass to be prepared using conventional methods. Differential thermal analysis shows that GLT glasses have high glass transition temperature and strong resistance to precipitation, with Tg and ΔT (ΔT =Tc-onset-Tg) greater than 833 and 209 ℃, respectively. The refractive index is up to 2.06. The transmittance can reach 78% in the visible and near-infrared wavelength bands. The influence of titanium contents on the structure, thermal, and optical property has been researched. The results show that the glass forming ability and thermal stability can be weakened by increasing the content of TiO2. The molar volume and oxygen electron polarizability exhibit the same variation trends as the refractive index of the samples. This glass is important for developing new devices with high performance, light weight, and small size.

show abstract

“…Accordingly, we applied this simulation technique in this work to report the radiation attenuation features of binary tellurite glass system. The novelty of the present work is studying the influence of the insertion La 2 O 3 with various concentrations (5,7,10,15, and 20 mol%) on the shielding features of a binary tellurite glass system, as was examined and fabricated by Kaur et al [26]. Kaur et al demonstrated that substituting Te 2 O 3 by La 2 O 3 increases the fabricated glasses' density from 5.67 g cm −3 to 5.76 g cm −3 .…”

Section: Introductionmentioning

confidence: 97%

The Role of La2O3 in Enhancement the Radiation Shielding Efficiency of the Tellurite Glasses: Monte-Carlo Simulation and Theoretical Study

et al. 2021

View full text Add to dashboard Cite

The radiation shielding competence was examined for a binary glass system xLa2O3 + (1 − x) TeO2 where x = 5, 7, 10, 15, and 20 mol% using MCNP-5 code. The linear attenuation coefficients (LACs) of the glasses were evaluated, and it was found that LT20 glass has the greatest LAC, while LT5 had the least LAC. The transmission factor (TF) of the glasses was evaluated against thicknesses at various selected energies and was observed to greatly decrease with increasing thickness; for example, at 1.332 MeV, the TF of the LT5 glass decreased from 0.76 to 0.25 as the thickness increased from 1 to 5 cm. The equivalent atomic number (Zeq) of the glasses gradually increased with increasing photon energy above 0.1 MeV, with the maximum values observed at around 1 MeV. The buildup factors were determined to evaluate the accumulation of photon flux, and it was found that the maximum values for both can be seen at around 0.8 MeV. This research concluded that LT20 has the greatest potential in radiation shielding applications out of the investigated glasses due to the glass having the most desirable parameters.

show abstract

Structural, thermal and optical characterization of co-existing glass and anti-glass phases of xLa2O3-(100-x)TeO2 and 2TiO2-xLa2O3-(98-x)TeO2 systems

Cited by 11 publications

References 38 publications

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

Structural, Thermal, and Optical Properties of GeO₂-La₂O₃-TiO₂ Glasses

The Role of La2O3 in Enhancement the Radiation Shielding Efficiency of the Tellurite Glasses: Monte-Carlo Simulation and Theoretical Study

Contact Info

Product

Resources

About

Structural, thermal and optical characterization of co-existing glass and anti-glass phases of xLa2O3-(100-x)TeO2 and 2TiO2-xLa2O3-(98-x)TeO2 systems

Cited by 11 publications

References 38 publications

Ln2Te6O15 (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu3+ Emission and Local Site Symmetry Analysis

Ln2Te6O15 (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu3+ Emission and Local Site Symmetry Analysis

Structural, Thermal, and Optical Properties of GeO2-La2O3-TiO2 Glasses

The Role of La2O3 in Enhancement the Radiation Shielding Efficiency of the Tellurite Glasses: Monte-Carlo Simulation and Theoretical Study

Contact Info

Product

Resources

About

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

Ln₂Te₆O₁₅ (Ln = La, Gd, and Eu) “Anti-Glass” Phase-Assisted Lanthanum-Tellurite Transparent Glass–Ceramics: Eu³⁺ Emission and Local Site Symmetry Analysis

Structural, Thermal, and Optical Properties of GeO₂-La₂O₃-TiO₂ Glasses