Synthesis and Characterization of an Aluminophosphate Material With A1PO-15 Framework Type Structure (original) (raw)
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Optical and structural investigation on rare-earth-doped aluminophosphate glasses
Optical Materials, 2006
Aluminophosphate glasses belonging to the oxide system Li 2 O-BaO-Al 2 O 3 -La 2 O 3 -P 2 O 5, un-doped and doped with rare-earth metal ions (Ce 4+ , Nd 3+ , Sm 3+ ) were obtained by a wet non-conventional method. The influence of the doping ions on the optical properties of the phosphate glasses has been investigated in relation with structural features of the vitreous matrix. The optical behavior has been studied by ultra-violet-visible-near-infra-red (UV-VIS-NIR) spectroscopy, revealing electronic transitions specific for rare-earth ions. Structural information via optical phonons was provided by infrared (IR) absorption spectra in the range 400-4000 cm À1 . Raman and fluorescence spectroscopy measurements have been performed. A strong fluorescence was observed in the visible spectrum, using 514.5 nm and 633 nm laser excitation.
Modifier effects on the properties and structures of aluminophosphate glasses
Journal of Non-crystalline Solids - J NON-CRYST SOLIDS, 2001
Properties and structures of potassium, barium and magnesium alumino-metaphosphate glasses (O/P≈3) have been investigated. Adding Al(PO3)3 to an alkali or alkaline earth metaphosphate glass improves the chemical durability, increases the glass transition temperature and reduces thermal expansion and residual OH-content. Infrared spectra are dominated by metaphosphate vibrational modes, the frequencies of which are dependent on the field strengths of the modifying cations. 27Al MAS NMR spectroscopy indicates that aluminum ions are incorporated into the aluminophosphate network primarily in octahedral sites, although tetrahedral and pentahedral sites are also present. The average aluminum co-ordination number decreases in the series K+>Ba2+>Mg2+ and this is related to a reduction in the basicity of glasses with higher field strength modifiers.
Journal of Electronic Materials, 2020
Luminescent phosphate glasses having the composition 40P 2 O 5-30ZnO-20BaF 2-3.8K 2 TeO 3-1.2Al 2 O 3-5Nb 2 O 5 in mol.% doped with 3 9 10 3 ppm and 4 9 10 3 ppm Sm 2 O 3 were successfully prepared by a melt-quenching technique. The investigated glasses were characterized by x-ray diffraction, UVvisible-NIR, absorption, emission, and fluorescence lifetime analysis. The radiative properties were calculated using Judd-Ofelt (J-O) spectral intensity parameters for each of the glasses, which revealed the following trend: X 2 > X 4 > X 6. The J-O intensity parameters were used to evaluate the spontaneous emission properties including branching ratios, transition probabilities, and radiative lifetime. The value of the optical energy band gap was found to decrease with an increase in Sm 3+ content, which is explained on the basis of structural changes. The calculated stimulated emission cross-section r SE ; at 1.62 lm of glasses studied was high, and increased from 3.81 9 10 À21 cm 2 to 4.38 9 10 À21 cm 2 with increasing Sm 3+ ion concentration. The structure of the glasses was investigated by computing Internuclear r i ð Þ, Polaron radius r p À Á and field strength F ð Þ and measurement of Raman spectra.
Optical characterization of the phosphate glasses containing pair transition ions
Optical and Quantum Electronics, 2007
The paper deals with optical and electronic properties of the aluminophosphate glasses containing Fe-Mn and Fe-Cr ion pairs in different concentration. The influence of the mixed alkali ions over the electronic properties has been investigated. The optical behavior (optical transmission) of the glass samples has been studied by UV-VIS spectroscopy and the refractive index dependency on wavelength has been discussed. The transmission spectra show features specific for the doping transition ions (TM), revealing different oxidation states of iron (Fe 2+ /Fe 3+ ), manganese (Mn 2+ /Mn 3+ ) and chromium (Cr 3+ /Cr 6+ ) in the vitreous network. Mössbauer spectroscopy offers information regarding the TM oxidation states, redox processes and the iron coordination symmetry in the vitreous network. In the case of Fe-Mn doped glasses, the percentage of Fe 2+ is about 40% and a doubled iron content leads to an increasing of Fe 2+ percentage up to 53%. The replacing of lithium ions by natrium ions (mixed alkali effect) provides an increasing of the Fe 2+ percentage up to 123 524 M. Elisa et al.
The structure and properties of zinc aluminophosphate glasses
2014
The glass forming region of the ZnO-Al 2 O 3 -P 2 O 5 (ZAP) system was determined and the structures and properties of the glasses were characterized. For glasses with a constant O/P ratio, i.e., with similar average phosphate anion distributions, and with increasing alumina content, there is an increase in molar volume and glass transition temperature and a decrease in density and refractive index. The structures of the ZAP glasses were characterized by Raman spectroscopy, 31 P and 27 Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and high pressure liquid chromatography (HPLC). Systematically shorter phosphate anions constitute the structures of glasses with greater O/P ratios. The average aluminum coordination number (CN Al ) changes systematically with composition, from~4.0 to~5.6, depending on the number of terminal oxygens available to coordinate each Al-cation. Glass properties are sensitive to both the types and concentrations of the P-anions as well as the CN Al .
Effect of Manganese Ions on Spectroscopic and Insulating Properties of Aluminophosphate Glasses
Advances in Materials Science and Engineering
The melt-quenching technique was used to produce 39CdO–10Al2O3-(51-x) P2O5: xMnO glasses (x = 0, 0.1, 0.2, 0.3, and 0.4 wt.%). Various stability factors were calculated and presented from DTA analysis. The stability of the glass network appears to increase with the increase of MnO concentration, according to the findings. IR spectral analysis of these glasses exhibited several symmetrical and asymmetrical bands due to phosphate groups. The observed change in these band intensities with the rise in MnO concentrations, ranging from 0.1 wt.% to 0.4 wt.%, shows an increase in the stability of the glass network. Optical absorption analyses of these glasses revealed an absorption band that shifted from 500 to 488 nm as the concentration of manganese oxide (MnO) increased from 0.1 wt.% to 0.4 wt.%, indicating that Mn2+ ions were gradually converted into Mn3+ ions. EPR spectra of these glasses were characterized by two signals due to Mn2+ and Mn3+ ions. Observations on these signal intensit...
Advances in Basic and Applied Sciences, 2024
The glass structure 50P2O5-30Na2O-10CaO-(10-x)Al2O3-(x)Sm2O3 was prepared using a standard melt annealing method, where x ranged from 0 to 8 mol% and with different Sm2O3 (x) concentrations. The impact of Sm 3+ ions in the produced glass network has been investigated using combined structural and optical properties. We looked at structural and optical factors like density, molar volume, and other optical properties. It was demonstrated that glassy samples are amorphous using X-ray diffraction. Empirical and experimental densities and molar volume are found to be having the same trend with increasing Sm2O3 contents. Fourier transform infrared absorption spectra (FTIR) have been carried out and analyzed using the deconvolution analysis route. Notable changes are observed within the fingerprint region from 450 cm-1 to 1700 cm-1 and prominent peaks are assigned to their respective phosphate vibrational groups. UV-VIS-NIR spectral data are plotted and different optical parameters such as optical energy gap, absorption and extension coefficients are calculated and interpreted in terms of direct and indirect transitions and correlated to their respective structural variations and state of samarium ions. .