The structure of potassium germanate glasses as revealed by Raman and IR spectroscopy

Королева, О. Н.; Штенберг, М. В.; Иванова, Т. Н.

doi:10.1016/j.jnoncrysol.2019.01.017

Cited by 34 publications

(34 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For these reasons, it was necessary to identify the contributions of the individual vibrational modes by deconvolution, involving the fitting of Gaussian peaks in different frequency regions of the spectra. Such Gaussian deconvolution has been described in previous spectroscopic studies of germanate, borate, and borogermanate glasses 8,20,25,[30][31][32][33][34][35][36] .…”

Section: Resultsmentioning

confidence: 78%

“…In the region below 400 cm -1 , peaks 1 and 2 could be attributed to bending modes of Ge-O-Ge in the glassy network 32,33 . Peak 3 could be assigned to the vibration of Ge-O -(Q 1 species) 31,33,34,37 . Peak 4 was assigned to symmetrical stretching vibrations of Ge-O-Ge bonds in 3-membered GeO4 rings 35,37 .…”

Section: Resultsmentioning

confidence: 99%

“…Deconvolution of the broad band centered at around 828 cm -1 resulted in the fitting of five peaks centered at around 753, 778, 815, 828, and 908 cm -1 . The first two (peaks 7 and 8) were assigned to the symmetrical stretching vibrations of metaborate chains and borate rings (di-triborate rings), respectively 32,34,37 . Previous investigations of germanate and borogermanate glasses using Raman spectroscopy found that the region between 800 and 900 cm -1 was dominated by vibrational modes of Q 2 and Q 3 units derived from the breakdown of tetrahedral [GeO4] units 31,32,[35][36][37] .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Franco

Ledemi

Correr

et al. 2021

Preprint

View full text Add to dashboard Cite

New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100-x)(41GeO2-25B2O3-4Al2O3-10Na2O-20BaO) – xTb4O7. Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (ΔT > 100 oC). An optical fiber was manufactured by a fiber drawing process. The UV-Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 µm. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (VB) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum VB values obtained at 650 and 1550 nm for the glass with x = 18 mol% were − 128 and − 17.6 rad T− 1 m− 1, respectively. The VB values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were − 110.2 and − 9.5 rad T− 1 m− 1, respectively, while the optical loss at around 880 nm was 6.4 dB m− 1.

show abstract

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Franco

Ledemi

Correr

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Recently, germanate glass systems attract a tremendous scientific attention due to their unique physical, optical, and structural properties [18][19][20][21]. For example, these glass systems have high solubility, high density, low melting points, wide light transmittance, high immunity, and high refractive indices [19][20][21][22]. Such promising properties of germanate glass systems encouraged us to investigate their fundamental radiation shielding features.…”

Section: Introductionmentioning

confidence: 99%

Effects of reducing PbO content on the elastic and radiation attenuation properties of germanate glasses: a new non‐toxic candidate for shielding applications

Al-Buriahi

Alzahrani

Olarinoye

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

This work presents a detailed study on the effects of reducing PbO content on the elastic and radiation shielding properties of germanate glasses described by the chemical formula 50GeO2-(50-x)PbO-xZnO, where x between 0 and 50 mol % with step of 10. A theoretical analysis based on Makishima-Mackenzie's theory (MM-theory) was employed to obtain the elastic moduli of the studied glass specimens. Moreover, the Monte Carlo simulations were applied via Geant4 platform to assess the radiation shielding ability of the GeO2-PbO-ZnO glass system by evaluating several fundamental properties such as gamma and neutron transmission factors, total cross sections, effective atomic numbers, 1/e penetration depths, and exposure buildup factors. We found that the bulk elastic modulus increased from 50.751 GPa to 85.389 GPa as the PbO content increased from 50 mol % to 0. The results of the linear attenuation coefficient show that the cross sections of ( ) , ( ) , and ( ) dominates the photon attenuation at 0.15 ≤ E ≤ 0.08; 0.8 < E < 8, and 8 < E < 15 MeV respectively. Moreover, the present glasses have superior photon absorbing capacity compared to ordinary and barite concrete; RS-253-G18 and RS-360 commercial glass shields. This 2 suggests that the GeO2-PbO-ZnO glass system can be used as a non-toxic shielding material in the nuclear facilities.

show abstract

“…Germanate glasses have been of great interest for many years because of the specificity of their physical properties, such as glass transition temperature, particularly [ 23 ]. Moreover, germanate glass systems exhibit the ability to absorb X-rays and high transparency in the near-infrared spectral region [ 24 ]. These systems have unique properties such as low phonon energy (~800 cm −1 ), good thermal stability, and good lanthanide ions solubility [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Transition Metals (Cr3+) and Lanthanides (Eu3+) in Inorganic Glasses with Extremely Different Glass-Formers B2O3 and GeO2

et al. 2021

View full text Add to dashboard Cite

Glasses containing two different network-forming components and doped with optically active ions exhibit interesting properties. In this work, glass systems based on germanium dioxide and boron trioxide singly doped with lanthanides (Eu3+) and transition metals (Cr3+) ions are research subjects. Optical spectroscopy was the major research tool used to record excitation and emission spectra in a wide spectral range for studied systems. The emitted radiation of glasses doped with Cr3+ ions is dominated by broadband luminescence centered at 770 nm and 1050 nm (4T2 → 4A2). Interestingly, the increase of concentration of one of the oxides contributed to the detectable changes of the R-line (2E → 4A2) of Cr3+ ions. Moreover, EPR spectroscopy confirmed the paramagnetic properties of the obtained glasses. The influence of molar ratio GeO2:B2O3 on spectroscopic properties for Eu3+ ions is discussed. The intensity of luminescence bands due to transitions of trivalent europium ions as well as the ratio R/O decrease with the increase of B2O3. On the other hand, the increase in concentration B2O3 influences the increasing tendency of luminescence lifetimes for the 5D0 state of Eu3+ ions. The results will contribute to a better understanding of the role of the glass host and thus the prospects for new optical materials.

show abstract

The structure of potassium germanate glasses as revealed by Raman and IR spectroscopy

Cited by 34 publications

References 24 publications

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

Effects of reducing PbO content on the elastic and radiation attenuation properties of germanate glasses: a new non‐toxic candidate for shielding applications

Transition Metals (Cr3+) and Lanthanides (Eu3+) in Inorganic Glasses with Extremely Different Glass-Formers B2O3 and GeO2

Contact Info

Product

Resources

About