Thermal, structure and morphological properties of lithium disilicate glasses doped with copper oxide and their glass–ceramic derivatives

ElBatal, H.A.; Mandouh, Z. S. El; Zayed, H. A.; Marzouk, Samir Y.; El-Komy, G.M.; Hosny, Ahmed

doi:10.1016/j.jnoncrysol.2012.05.026

Cited by 28 publications

(6 citation statements)

References 24 publications

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“…In general, a decrease of T g is predicted by a decrease of rigidity in structure. The previous study reported the similar trend that the T g decreased as the CuO content increased [19]. It indicated that the introduction of CuO was assumed to convert the bridging oxygen bonds into nonbridging oxygen bonds in the lithium silicate glass network.…”

Section: Introductionsupporting

confidence: 58%

“…On the other hand, there were several reports of the opposite effect of CuO on Tg, i.e., a decrease in Tg. It was reported that the Tg decreased as the CuO concentration increased in the SiO2-Li2O-Al2O3-CuO glass system [19]. Justyna Sułowska et al presented that the Tg decreased as the CuO concentration increased in SiO2-P2O5-K2O-MgO-CaO-CuO glasses.…”

Section: Introductionmentioning

confidence: 99%

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The Tuning Capability of CuO and Na2CO3 Dopant on Physical Properties for Laser Sealing Using Fiber Types of Sealant

et al. 2020

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PbO-SiO2-Al2O3-B2O3 (PSAB)-based glasses were prepared in order to determine the feasibility for laser sealing in the form of fiber. To reach a high quality of laser sealing, the tuning capability of CuO and Na2CO3 dopant concentration was examined on thermal, thermo-mechanical, and optical properties of glasses. The difference of thermal expansion coefficient was reduced with codoping of 1 wt% CuO-2 wt% Na2CO3 into the PSAB glass system, and it amounted to 0.34 × 10−6/K. The codoped PSAB glass system reached 100% absorption at 810 nm, which corresponds to the wavelength of laser. The glass fiber with a diameter of 180 μm was successfully pulled from the codoped PSAB glass system. The fluorine-doped tin oxide (FTO) glass substrate using the glass fiber was successfully sealed. It presented a crack-free sealed surface with a sealing strength of about 41 MPa. These results indicate that the PSAB-based glass system in the form of fiber is proved as a laser sealing material in packaging systems.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

The Tuning Capability of CuO and Na2CO3 Dopant on Physical Properties for Laser Sealing Using Fiber Types of Sealant

et al. 2020

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“…In the third (type III) sequence only the LS 2 phase nucleates from the beginning, while LS is completely absent. 22,23 Owing to the attractive machinability of LS, the former two types of glass 24 are usually preferred for the manufacturing of dental glass−ceramic products with desirable geometries using standard CAD/CAM systems. 25 In situ experimentation, using either neutron or synchrotron X-rays, is crucial to monitoring the crystallographic structural changes in a material system that take place under certain circumstances, such as precipitation in solutions or solidsolutions, 26 crystallization of amorphous materials, 27 decomposition of compounds, 28 synthesis or sintering of polycrystalline materials, 29 and electrochemical activity in lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

“…The first (type I) phase transformation sequence involves the simultaneous nucleation of LS and LS 2 phases at low temperatures. − ,− In the second (type II) sequence LS nucleates solely and then transforms to LS 2 at a higher temperature. − The temperatures for LS nucleation and its phase transformation to LS 2 are composition dependent. In the third (type III) sequence only the LS 2 phase nucleates from the beginning, while LS is completely absent. , Owing to the attractive machinability of LS, the former two types of glass are usually preferred for the manufacturing of dental glass–ceramic products with desirable geometries using standard CAD/CAM systems …”

Section: Introductionmentioning

confidence: 99%

Structural Response of Lithium Disilicate in Glass Crystallization

Huang

Gao

et al. 2014

Crystal Growth & Design

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The Li 2 O·SiO 2 related glass systems have attracted extensive theoretical and experimental investigations for several decades. There are three different crystallization sequences commonly reported in lithium disilicate glasses although their contributing factors are unclear. Moreover, the effect of concurrent precipitation of crystalline phases during glass crystallization is rarely reported from a microscopic perspective. In this work, we observed the structural response of lithium disilicate (Li 2 Si 2 O 5 ) to other crystalline phases, as probed in different types of lithium disilicate glasses by in situ synchrotron X-ray powder diffraction. The evolution of crystallographic structure of Li 2 Si 2 O 5 along its c axis showed a silica-controlled fashion, viz., its evolution trend reverses whenever a crystalline silica phase precipitates. Besides, the evolution characteristics of the c axis of Li 2 Si 2 O 5 at the nucleation stage differ if the crystallization sequence changes. These findings may initiate a novel crystallographic approach for analyzing the intrinsic mechanisms of reaction, nucleation, or crystallization in systems involving crystalline phases.

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“…Analysis of these results reveals they are in good agreement with previously reported results. 7,22,26,40 Photoluminescence Room-temperature photoluminescence spectra of Li 2 Si 2 O 5 :Ce phosphor are shown in Fig. 4.…”

Section: Ftirmentioning

confidence: 99%

Characterization, Luminescence, and Defect Centers of a Ce3+-Doped Li2Si2O5 Phosphor Prepared by a Solution Combustion Reaction

Singh

Watanabe

Rao

et al. 2015

Journal of Elec Materi

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Li 2 Si 2 O 5 doped with Ce was synthesized by solution combustion. The phosphor was characterized by powder x-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). Photoluminescence was investigated by excitation with UV radiation at 244 nm. An emission peak of the Ce 3+ ion was observed at 400 nm. Gamma irradiated phosphor exhibits six thermoluminescence (TL) peaks at 110°C, 160°C, 190°C, 250°C, 320°C, and 370°C. Electron spin resonance (ESR) spectroscopy was used to study the defect centers induced in the phosphor by gamma irradiation and to identify the centers responsible for the TL process. The room-temperature ESR spectrum of the irradiated phosphor seemed to be a superposition of at least four distinct centers. One of the centers (center I) with principal g values g jj ¼ 2:0307 and g^= 2.0040 was identified as an O 2 À ion. Center II, with an isotropic g factor 2.0070, was identified as an F + -type center (singly ionized oxygen vacancy); this center correlates with the main low-temperature TL peak at 110°C. Center III was identified as a Ti 3+ center and center IV, with a hyperfine interaction with a 29 Si nucleus, as an intrinsic O À -type center with a neighboring silicon ion. A Ti 4+ ion, the precursor of the Ti 3+ center, acts as a recombination center for the 110°C TL peak whereas a Ti 3+ center relates to the main 250°C TL peak and is also the likely recombination center for this peak. An O À ion is associated with the 110°C TL peak as a possible recombination center. An additional defect center (V) was observed during thermal annealing experiments. This center (identified as an F + center) seems to originate from an F center (oxygen vacancy with two electrons) and is not related to the any of the observed TL peaks.

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Thermal, structure and morphological properties of lithium disilicate glasses doped with copper oxide and their glass–ceramic derivatives

Cited by 28 publications

References 24 publications

The Tuning Capability of CuO and Na2CO3 Dopant on Physical Properties for Laser Sealing Using Fiber Types of Sealant

The Tuning Capability of CuO and Na2CO3 Dopant on Physical Properties for Laser Sealing Using Fiber Types of Sealant

Structural Response of Lithium Disilicate in Glass Crystallization

Characterization, Luminescence, and Defect Centers of a Ce3+-Doped Li2Si2O5 Phosphor Prepared by a Solution Combustion Reaction

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