Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

Paszkowicz, W.; Wolska, A.; Klepka, Marcin T.; All, S. Abd El; Ezz-Eldin, F.M.

doi:10.12693/aphyspola.117.315

Cited by 5 publications

(5 citation statements)

References 34 publications

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“…The broad peak centered at 3442 cm À1 corresponds to O-H symmetric stretching of the surface hydroxyl group. In accordance with previous work, 7,22,26 the peaks observed between 400 cm À1 and 600 cm À1 can be ascribed to Si-O-Si and O-Si-O bending vibrations. The peaks observed between 700 cm À1 and 1200 cm À1 can be ascribed to Si-O-Si symmetric stretching and Si-O-Si asymmetric stretching.…”

Section: Ftirsupporting

confidence: 92%

“…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%

“…16 Li 2 Si 2 O 5 has been investigated in detail, because of its high crystallinity and mechanical properties, and has a wide range of practical applications, especially for dental restorations. [17][18][19] A computational study of the structural, elastic, and electronic properties of Li 2 Si 2 O 5 glass ceramic was performed by Biskri et al 20 The effect of manganese on the structure, crystallization, and sintering of nonstoichiometric Li 2 Si 2 O 5 glasses was investigated by Gaddam et al 21 Paszkowicz et al 22 have reported an x-ray diffraction and absorption study of crystalline vanadium-doped Li 2 Si 2 O 5 . The physical properties of Li 2 Si 2 O 5 glasses doped with different amounts of V 2 O 5 have been investigated before and after irradiation with gamma-rays.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ftirsupporting

confidence: 92%

Section: Ftirmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…13 The monoclinic cell of meta-stable Li 2 Si 2 O 5 has a different symmetry but the same size as the Ccc2 stable form (β = 90°). 14 During sintering at 950 °C individual particles start to connect diffusively and, thus, better particle bonding in comparison to 750 °C was reached. The compactness of the obtained materials is strongly connected to their phase miscibility.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Properties of Lithium Silicate Fired by Spark Plasma Sintering

Ctibor¹,

Hudec²,

Sedláček³

et al. 2020

ECS J. Solid State Sci. Technol.

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This paper aims to study various physical properties of lithium silicate ceramics. The work starts with the synthesis followed by characterization of the compounds. The samples are synthesized by reaction between SiO2 and Li2CO3 powders, compacted by spark plasma sintering (SPS) and then characterized by XRD, SEM and other techniques. The electrical properties are studied by dielectric spectroscopy. Dielectric and conductive properties of lithium silicate depend on the composition and microstructure, which factors are interconnected with the processing parameters. Li2SiO3 and Li2Si2O5 were the major components present in the SPS bulk. The best combination of dielectric parameters is relative permittivity 6.41 and loss tangent 0.001 at frequency 0.9 MHz for the sample sintered at 950 °C for 30 min. Relative permittivity as well as loss tangent was monitored to increase with temperature up to 250 °C.

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“…Lithium disilicate glass ceramics have three major phases: an orthorhombic (space group Ccc 2) stable form, an orthorhombic ( Pbcn ) metastable form and a monoclinic ( C 1 c 1) form . Many authors have noted that the monoclinic ( C 1 c 1) phase has very similar lattice parameters to the orthorhombic ( Ccc 2) form . This is the main reason why researchers have mostly concentrated on two significant phases (metastable and orthorhombic), considering the fact that both structures have similar cell parameters, in addition to the discrepancies in diffraction peak intensities between experimental and theoretical structures .…”

Section: Introductionmentioning

confidence: 99%

Structural properties and mechanical stability of monoclinic lithium disilicate

Zulueta¹,

Dawson

Froeyen

et al. 2017

Phys. Status Solidi B

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The structural, electronic and mechanical properties of monoclinic Li2Si2O5 are explored using density functional theory. Different exchange–correlation functionals are considered and the results are correlated to experimental data. The calculated electronic band structure and density of states indicate that monoclinic Li2Si2O5 has an insulating character with an indirect band gap of 4.98 eV. Elastic stiffness coefficients and the bulk, shear and Young's moduli are also calculated. Our calculations predict that Li2Si2O5 is a ductile compound. We show that monoclinic Li2Si2O5 behaves as a specially orthotropic material, meaning that the structure can be masked by the orthorhombic form.

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Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

Cited by 5 publications

References 34 publications

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

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

Dielectric Properties of Lithium Silicate Fired by Spark Plasma Sintering

Structural properties and mechanical stability of monoclinic lithium disilicate

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