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Gotowa bibliografia na temat „FTIR Spectra - Network Structure - Glasses”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "FTIR Spectra - Network Structure - Glasses"

Montenero, A., R. A. Condrate i Y. M. Guo. "Structural information concerning the glass network in Bi–Zn–Fe–B–O glasses". Journal of Materials Research 4, nr 3 (czerwiec 1989): 473–75. http://dx.doi.org/10.1557/jmr.1989.0473.

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Fourier transform infrared (FTIR) absorption spectra were measured for various glasses in the Bi–Zn–Fe–B–O system, and interpreted upon the basis of glass structure. Spectral changes were noted with variations in the composition for these glasses that were related to changes in the atomic arrangement of the boron oxide portion of the glass network. The changes in glass transformation temperature with changes in glass composition were discussed in terms of structural data.

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ARDELEAN, I., C. ANDRONACHE, C. CÎMPEAN i P. PǍŞCUŢǍ. "STRUCTURAL STUDY OF x(Fe2O3·V2O5)·(100-x)[P2O5·Li2O] GLASS SYSTEM BY FTIR SPECTROSCOPY". Modern Physics Letters B 20, nr 02n03 (30.01.2006): 105–10. http://dx.doi.org/10.1142/s0217984906009335.

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Glasses of the x( Fe 2 O 3· V 2 O 5)·(100-x)[ P 2 O 5· Li 2 O ] system, with 0≤x≤50 mol %, were prepared and investigated by FTIR spectroscopy in an attempt to determine the local structure of glasses. The interpretation of the obtained IR spectra revealed the presence and the dependence of the local structural units in the studied glasses on the iron and vanadium ions content. The results showed that phosphate units are the main structural units of the glass system and the iron and vanadium ions are located in the network. The increasing of iron and vanadium ions content indicate a gradual decreasing in the number of bridging oxygen ions and an increasing in the number of nonbridging oxygen ions.

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Wang, Fei, Artemis Stamboulis, D. Holland, Shigeki Matsuya i Akari Takeuchi. "Solid State MAS-NMR and FTIR Study of Barium Containing Alumino-Silicate Glasses". Key Engineering Materials 361-363 (listopad 2007): 825–28. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.825.

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The glass based on a 1.5SiO2-Al2O3-0.5P2O5-CaO-0.67CaF2 composition was produced and substituted gradually by barium. The structure of the glasses was studied by multinuclear Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and Fourier Transform Infrared Spectroscopy (FTIR). It was indicated by 29Si and 31P MAS-NMR spectra that silicon was present as Q4 (4Al) and Q3 (3Al) species and phosphorus was in a Q1 pyrophosphate environment. 29Al MAS-NMR spectra showed that four fold coordinated aluminum Al (IV) was the dominant species with a second peak assigned to octahedral aluminum Al (VI). The 19F spectra suggested that the barium addition caused the formation of Al-F-Ba(n) and F-Ba(n) species. Furthermore, a distribution of silicate network including Si-O-Si stretching (Q4 and Q3) and Si-O-[NBO] (Q3) per SiO4 was reflected by the FTIR study.

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Majhi, M. R., R. Kumar, S. P. Singh i R. Pyare. "Physico-Chemical Properties and Characterization of CaO-Fe₂O₃-P₂O₅ Glass as a Bioactive Ceramic Material". Journal of Biomimetics, Biomaterials and Tissue Engineering 12 (luty 2012): 1–24. http://dx.doi.org/10.4028/www.scientific.net/jbbte.12.1.

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The Aim of this Work Is to Investigate Role of Iron in Calcium-Iron-Phosphate Bioglass. the Density, Compressive Strength, Tg Point and Leachability of Cations Were Measured. the Ph Behaviour of Simulated Body Fluid after Soaking Phosphate Glasses for Different Time Periods Were Also Studied and it Was Observed that Higher Phosphate Glasses Containing Lower Lime Possessed Better Bioactivity than Lower Phosphate Glasses Containing More Iron and Lime Contents. the DTA and FTIR Spectrometry of Glasses Were Performed. the Absorption Spectra Showed that Iron Was Present in the Glass only as Fe3+ Ion. the Leachability of Ca2+ and Fe3+ Ions from Glass Was due to Diffusion Control and P5+ Ion due to Network Break down of PO4 Tetrahedra. the DTA Peaks Were Broad. the FTIR Band around 1000 Cm-1 in Glass Was due to Asymmetric Stretching of O=P=O Linkage. the FTIR Absorption and Reflectance Spectrometry of the Glass Samples after SBF Treatment Had Confirmed the Deposition of Bone-Like Hydroxyl Carbonate Apatite Layer on the Glass Surfaces for their Bioactivity. the Bands Centred in between 2880-3425 Cm-1 Were due to Presence of OH Groups and Stretching Modes of H-O-H Vibration in Glasses. the Properties and Structure Relationship for Glasses Were Established and the Results Were Discussed.

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Veeranna Gowda, Vijaya Chikkaveeraiah, K. R. Sardar Pasha, M. Sudhakar Reddy i C. Narayana Reddy. "Optical Properties and Structural Studies on Nd³⁺Doped Borate Glasses Containing Heavy Metal Oxide". Advanced Materials Research 584 (październik 2012): 207–11. http://dx.doi.org/10.4028/www.scientific.net/amr.584.207.

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Abstract. Neodymium doped sodium bismuth borate (Na2O-Bi2O3-B2O3) glasses were prepared by melt quenching method. Amorphous nature of the glass is confirmed through the X-ray diffraction study. Density of the investigated glasses increases systematically with Bi2O3 concentration. Glass transition temperature decrease slightly with increase of Bi2O3 content and could be due to increase in the number of weaker Bi-O linkages by stronger Nd-O linkages. Fourier Transform - Infrared (FTIR) spectroscopy has been carried out. The IR spectra of the glasses reveal that the strong network consisting of diborate units and is unaffected by the variation of Nd3+ concentration. UV-Visible absorption studies have been performed on these glasses to examine the optical spectra and the optical band gap energy has been calculated. The intensity of the absorption band increases with the increase of Nd3+ concentration. This is due to the formation of non-bridging oxygens (NBO’s) in the structure.

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Subashini, C., R. Ezhil Pavai i L. Balu. "Effect of Pb2+ Ions on the Mechanical, Structural and Thermal Behaviour of B2O3-CaO Glasses". Asian Journal of Chemistry 32, nr 1 (18.11.2019): 101–5. http://dx.doi.org/10.14233/ajchem.2020.22337.

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B2O3-CaO-PbO glasses with different concentrations of PbO (5-20 mol % in four steps) were prepared by melt quench technique. The amorphous nature and homogeneities of the prepared glasses were confirmed by XRD and SEM analyses. Ultrasonic velocities and density were measured at 303 K using pulse-echo technique and Archimedes’ principle respectively. Various parameters, viz., molar volume, longitudinal modulus, shear modulus, bulk modulus, Young’s modulus, Poisson’s ratio, micro-hardness and Debye temperature have been evaluated from the measured data. The results of ultrasonic properties indicate that the incorporation of lead ions expand the calcium borate network structure. FTIR spectra revealed that boron exists in both trigonal and tetrahedral structural units and no boroxial ring formation takes place in the glass structure. The transition temperature, melting temperature and crystallization temperature have been identified using DTA measurements.

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Feike, M., K. Meise-Gresch, Qi Chen i G. H. Frischat. "NMR and FTIR Characterization of Sol-Gel Derived Ternary Oxide Glasses in the System BaO–TIO2–SiO2". Zeitschrift für Naturforschung A 50, nr 9 (1.09.1995): 837–44. http://dx.doi.org/10.1515/zna-1995-0908.

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Abstract The annealing history of glasses in the system (20-40) BaO-40TiO2(40-20)SiO2 has been monitored by 29Si MAS NMR and FTIR spectroscopy from the dried gel to the final glassy state. Assignment of chemical shifts to specific building units has been facilitated by comparative studies of the limiting less complex binary silicate systems. From the NMR spectra at various compositions appreciable condensation to a three-dimensional network is inferred already at low drying temperatures. Processes like the pyrolysis of acetate rests of the starting materials and modification of the silicate structure due to Ba2+ cations have been mirrored in the spectra of both methods for samples annealed at intermediate temperatures. The microstructure of the final gel glass of the ternary system has been determined spectroscopically to consist of silicate and titanate species typical of crystalline fresnoite, whereas remaining amounts of TiO2 and SiO2 develop a separate network each. Only small amounts of Si-O-Ti linkages have been recognized in the vibrational absorptions; they vanish at higher annealing stages.

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PAL SINGH, GURINDER, PARVINDER KAUR, SIMRANPREET KAUR, DEEPA WALI ARORA, MOHANDEEP SHARMA i D. P. SINGH. "EFFECT OF ALUMINIUM IONS ON COVALENT BEHAVIOUR OF Li2CO3-B2O3 GLASSES". International Journal of Modern Physics: Conference Series 22 (styczeń 2013): 313–20. http://dx.doi.org/10.1142/s2010194513010283.

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The paper undertakes the preparation of Aluminium oxide doped Lithium borate glasses and characterizes to investigate the physical and optical studies of these glasses using density and UV-Visible spectroscopy. Results had been obtained with the help of FTIR Spectra in our previous work which indicate that Al2O3 acts as a network modifier by converting three coordinated boron atoms [ BO3 ] to four coordinated boron atoms [ BO4 ]. The effect of aluminium content on the optical properties of the present glass system has been studied from the optical absorption spectra. It shows the shifting of the band edge towards the higher wavelength and that there is corresponding decrease in the band gap, which is due to the conversion of BO3 to BO4 units. The evaluation of the compact structure of prepared glass samples with the presence of [ BO4 ] groups has been made in terms of the physical properties such as density and molar volume. It is also confirmed by average boron-boron separation results. The research findings confirm that the addition of Aluminium oxide increases the covalent value and corresponding decrease in ionicity behaviour.

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Mostafa, Ahmed M. A., Mohamed A. M. Uosif, Ziyad A. Alrowaili, Reda Elsaman, Ahmed A. Showahy, Yasser B. Saddeek, Shams A. M. Issa, Antoaneta Ene i Hesham M. H. Zakaly. "The Influence of CoO/P2O5 Substitutions on the Structural, Mechanical, and Radiation Shielding of Boro-Phosphate Glasses". Materials 14, nr 21 (3.11.2021): 6632. http://dx.doi.org/10.3390/ma14216632.

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A new glass system (50−x)P2O5–20B2O3–5Al2O3–25Na2O–xCoO was manufactured using a standard melt quenching procedure, where 1≤ x ≤ 12 mol%. The characteristics of boro-phosphate-glasses containing CoO have been studied. The effect of CoO on the radiation-protective properties of glasses was established. The density of the prepared glasses as a function of CoO increased. XRD was used to check the vitreous structure of samples. Fourier-transform infrared (FTIR) spectroscopy was used to study the structure of each sample. FTIR demonstrated that connections grew as CoO/P2O5 levels increased, and the FTIR spectra shifted to higher wavenumbers. The increment of CoO converts non-bridging oxygens associated with phosphate structural units into bridging oxygens. This process increases the concentration of BO4 structural units and creates new, strong and stable bonds B–O–P, i.e., there is polymerization of the boro-phosphate glass network. With an increase in the ratio of CoO/P2O5 in the produced samples, ultrasonic velocities and elastic moduli were observed to increase. The coefficients of linear and mass attenuation, the transmittance of photons in relation to the photon energy, the efficiency of radiation protection in relation to the photon energy, and the thickness of the absorber were modeled using these two methods (experimental and theoretical). From the obtained values, it can be concluded that the 12Co sample containing 12 mol% will play the most influential role in radiation protection. An increase in the content of cobalt-I oxide led to a significant increase in the linear and mass attenuation coefficient values, which directly contributes to the development of the radiation-protective properties of glass.

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Anigrahawati, Puzi, i Md Rahim Sahar. "Structural Properties of Erbium Doped Tellurite Glass Embedded with Natural Ferrite Oxide Nanoparticles". Solid State Phenomena 268 (październik 2017): 177–80. http://dx.doi.org/10.4028/www.scientific.net/ssp.268.177.

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Natural ferrite oxide nanoparticles (NPs) embed with tellurite glasses ((89-x) TeO2-10ZnO-1Er2O3-(x)Fe3O4, (x = 0 – 0.8 mol %)) were prepared by conventional melt quenching method to study the influence of the Fe3O4 NPs concentration on the stuctural properties of the glass. Studies on these glassy materials characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and RAMAN spectroscopic measurements are presented. It is observed that the amorphous nature of the glass is confirmed by x-ray diffraction. The FTIR studies support the formation of Te-O-Fe linkages. The FTIR spectra reveal modification in network structures evidenced from vibrational wave-number shifts of TeO4 and TeO3 structural units. Raman spectroscopy have been manipulated to observe the structural modification of [TeO4] trigonal bipyramidal structural unit.

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Rozprawy doktorskie na temat "FTIR Spectra - Network Structure - Glasses"

Chen, Ping. "Intermediate phases, boson and floppy modes, and demixing of network structures of binary As-S and As-Se glasses". University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250689099.

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Streszczenia konferencji na temat "FTIR Spectra - Network Structure - Glasses"

Seeber, W., D. Ehrt, T. Danger, E. Heumann, E. Mix i G. Huber. "Improved Yb-doped fluoride phosphate laser glasses with optimized local structure". W The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cml2.

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The favorable laser properties of Yb-doped earth alkaline fluorapalite crystals (FAP) have been demonstrated [1]. Fluoride phosphate (FP) glasses are a kind of amorphous analogon to these both fluoride and phosphate anions containing crystals. It could be shown that Yb-doped FP-glasses have the potential for cheap diode pumped cw-lasers acting at wavelength around 1.04 μm at room temperature (2). In first experiments using laser diodes emitting at 968 nm (longitudinal pumping geometry, hemispheric resonator with an output mirror of r = −5 cm radius of curvature, T = 2 %) and not optimized FP-glasses we achieved maximum output powers Pout of about 145 mW and absorbed pump powers at thresholds Pthr,abs of about 185 mW. Recently, experiments with optimized glasses demonstrated improved laser performance (up to Pout of about 220 mW;Pthr,abs ~106 mW) [3]. Similar to DeLoach et al. [4] we trace the surprisingly good laser parameters to the special energy level structure of the 2F7/2:Yb ground manifold in the mentioned materials. The laser transition terminates at an electronic Yb-level (about 600 cm−1 above the ground state) interacting with the local vibrational modes of localized Yb-O bonds. The huge variety of FP-glass compositions provides a useful tool to tailor the local structure at the site of the Yb-ion and in this way the electron-phonon interactions itself. To optimize the host glass matrix we used the following simple structural model: Yb3− ions are mostly six co-ordinated in the investigated FP-glasses. Three PO43− (phosphate)-tetra-hedra form a cluster with D3-symmetry about the Yb ion. So-called v4-vibrations of the surrounding phosphate groups (~ 570 cm−1) can interact with the electronic Yb-transition. The addition of heavy ions (e.g. Ba) and other tetrahedral groups (e.g. SO42−) to batch composition: 95 mol-% (AlF3 earth alkaline fluorides) - 5 mol-% Sr(PO3)2 strongly improves the laser properties. This can be explained by formation of [Yb(PO4)3]-clusters which are nearly isolated from the mainparts of the network. Because of the inhomogeneous site variation in glasses no detailed structures in the absorption spectra could be observed even at low temperatures. Nevertheless, the corresponding terminal laser level (~ 600 cm−1 at high pump power densities) supports the assumption of efficient electron-phonon coupling. The intensity borrowing effect by this mechanism can be understood in terms of a electron-vibrational coupling constant [4], but the direct influence on the laser properties itself is not yet understood. We believe that the electron-phonon coupling efficiently depopulates the terminal laser level too. In conclusion, efficient cw-laser action in optimized FP-glasses can be traced to nearly isolated [Yb(PO4)3]-clusters with effective electron-phonon coupling.

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