7783-52-0Relevant academic research and scientific papers
Chlorine evolution during the fusion of chlorofluoroindate glasses
Delben,Rojas,Miazato,Melnikov,Delben,Cardoso,Job
, p. 469 - 472 (2005)
Samples with a composition of 40InF3-20ZnF2-5MCl- xBaF2-ySrF2, where M=Na, Li and x+y=35 mol%, were prepared. The thermal properties related to the Ba/Sr ratio and to the remaining chlorine content in the glasses were studied. Thermal stability is improved with the addition of chlorine. However, chlorine concentration is regulated by the sublimation of indium fluorides which takes place at about 600°C. Indium fluorides arc formed during glass fusion. The mechanisms of chlorine sublimation were studied.
Novel fabrication process of planar waveguides in rare-earth doped fluoroindate glasses
Melo, R. P. de Jr.,Silva, B. J. P. da,Falcao-Filho, E. L.,Silva, E. F. da Jr.,Petrov, D. V.,et al.
, p. 886 - 887 (1995)
A method to fabricate planar waveguides in rare-earth doped fluoroindate glasses has been developed. This method of preparing waveguides in this kind of glass opens new prospects in fluoroindate glass research and development. The potential of these waveguides for devices operating in the communications wavelengths is anticipated to be very promising since the rare-earth doped fluoroindate glass exhibits small nonradiative relaxation rates for the rare-earth ions.
Infrared-to-visible CW frequency upconversion in Er3+-doped fluoroindate glasses
de Araujo,Menezes,Maciel,Acioli,Gomes,Messaddeq,Florez,Aegerter
, p. 602 - 604 (1996)
An effective CW pumped infrared-to-visible upconversion in Er3+-doped fluoroindate glass is demonstrated. InF3 is obtained by fluoration in In2O3 at 400°C with NH4H and HF in a platinum crucible. All fluoride components are then mixed and heated in a dry box under argon atmosphere at 700°C for melting and 800°C for finning. Next, the melt is poured and cooled into a preheated brass mold. Continuous-wave upconversion fluorescence measurements are performed using a diode laser emitting at 1.48μm as the excitation source.
The crystal structure of the weberite Na2MgInF7
Caramanian, Armen,Souron, Jean-Paul,Gredin, Patrick,De Kozak, Ariel
, p. 234 - 238 (2001)
The fluoride Na2MgInF7 is orthorhombic: a = 10.435(1) A, b = 7.345(1) A, c = 7.553(1) A, Z = 4. Its crystal structure was solved in the space group Pnma (No. 62), from X-ray single crystal data using 1879 unique reflections (1183 with Fo/σ(Fo)>4). The three-dimensional network is built up from tilted chains of trans corner-sharing [MgF6] octahedra running along the shortest axis of the cell. These chains are linked together through four corners of [InF6] octahedra. The sodium ions are 8 and 7 coordinated to fluorine. The [NaF8] polyhedron can be described as a distorted cube, whereas the [NaF7] polyhedron is a pentagonal bipyramid. Despite a different space group, the crystal structure of Na2MgInF7 can be easily related to the orthorhombic body-centered weberite-type structure.
Distribution coefficients of impurities in cadmium fluoride
Ivanov,Buchinskaya,Fedorov
, p. 392 - 396 (2000)
Experimental data on the liquidus curve in cadmium fluoride-metal fluoride systems were used to calculate the distribution coefficients of di- and trivalent impurities in CdF2. A similar method was proposed for calculating the distribution coefficient from solidus data. It was shown that the variations of the calculated distribution coefficients with the ionic radii of M2+ and R3+ are well fitted by Gaussians. Phase relations in the CdF2-rich part of the CdF2-InF3 system were studied by differential thermal analysis and x-ray diffraction.
Structure and thermal stability of novel fluorophosphate glasses
Sun, Hongtao,Zhang, Liyan,Xu, Shiqing,Dai, Shixun,Zhang, Junjie,Hu, Lili,Jiang, Zhonghong
, p. 151 - 155 (2005)
A systematic investigation on glass formation in the PbF 2-InF3-BaHPO4 ternary system has been carried out. These glasses have characterized by IR spectra, Raman spectra and differential thermal analysis. The results show that the structure of these glasses is mainly affected by BaHPO4 and InF3 contents. With decreasing BaHPO4 content, the glass structure gradually transforms from metaphosphate to polyphosphate. When InF3 content is low, it mainly acts as network modifier, when its content is high; it enters glass matrix and forms In(O,F)6 groups connecting the polymerized phosphorus oxygen species. PbF2 mainly acts as network modifier in this system. Systematic variations of the glass transition temperature and the thermal stability index agree well with these results. The most stable glass with ΔT = 230 °C and S = 21.79 K is obtained.
Optical properties of chromium-doped fluoroindate glasses
Mendonca,Costa,Messaddeq,Zilio
, p. 2483 - 2487 (1997)
This work reports on the optical properties of Cr3+ ions in the pseudoternary system InF3-GdF3-GaF3. Linear properties, investigated through absorption and emission spectra, provide information on the crystal field, the frequency, and number of phonons emitted during the absorption to the 4T2 band and the emission to the 4A2 ground state, and the Fano antiresonance line shape in the vicinity of the 4A2→2E transition. A study of the nonlinear refractive index as a function of the wavelength, carried out with the Z-scan technique, provides spectroscopic data about electronic transitions starting from the excited state.
Frequency upconversion in Er3+-doped fluoroindate glasses pumped at 1.48 μm
Maciel,De Araujo, Cid B.,Messaddeq,Aegerter
, p. 6335 - 6342 (1997)
We report on efficient frequency upconversion in Er3+-doped fluoroindate glass. The process is observed under 1.48 μm laser diode excitation and results in fluorescence generation in the range from ultraviolet to near-infrared radiation. The study was performed for samples containing 1, 2, and 3 ErF3 mol % in the range of temperatures from 24 to 448 K. The upconverted signals were studied as a function of the laser intensity, and their dynamical behavior is described using a rate equation model which allows us to obtain the energy transfer rates between Er3+ ions in pairs and triads.
Quantum-chemical calculations and IR spectra of the (F2)MF 2 molecules (M = B, Al, Ga, In, Tl) in solid matrices: A new class of very high electron affinity neutral molecules
Wang, Xuefeng,Andrews, Lester
, p. 3768 - 3771 (2011/04/26)
Electron-deficient group 13 metals react with F2 to give the compounds MF2 (M = B, Al, Ga, In, Tl), which combine with F 2 to form a new class of very high electron affinity neutral molecules, (F2)MF2, in solid argon and neon. These (F 2)MF2 fluorine metal difluoride molecules were identified through matrix IR spectra containing new antisymmetric and symmetric M-F stretching modes. The assignments were confirmed through close comparisons with frequency calculations using DFT methods, which were calibrated against the MF3 molecules observed in all of the spectra. Electron affinities calculated at the CCSD(T) level fall between 7.0 and 7.8 eV, which are in the range of the highest known electron affinities.
Preparation and characterization of high-purity metal fluorides for photonic applications
Patterson, Wendy M.,Stark, Peter C.,Yoshida, Thomas M.,Sheik-Bahae, Mansoor,Hehlen, Markus P.
, p. 2896 - 2901 (2011/12/22)
We combine chelate-assisted solvent extraction (CASE) and hot hydrogen fluoride gas treatment to enable a general method for the preparation of high-purity binary metal fluorides. The fluorozirconate glass ZBLANI:Yb 3+ (ZrF4-BaF2-LaF3-AlF 3-NaF-InF3-YbF3), a solid-state laser-cooling material, is used as a test case to quantitatively assess the effectiveness of the purification method. The reduction of transition-metal and oxygen-based impurities is quantified directly by inductively coupled plasma mass spectrometry (ICP-MS) and indirectly by laser-induced cooling, respectively. The concentrations of Cu, Fe, Co, Ni, V, Cr, Mn, and Zn impurities in the ZrCl 2O precursor solution were measured individually by ICP-MS at various stages of the purification process. CASE was found to reduce the total transition-metal concentration from 72500 to ～100 ppb. Laser cooling was most efficient in ZBLANI:Yb3+ glass fabricated from CASE-purified metal fluoride precursors, confirming the results of the ICP-MS analysis and demonstrating the effectiveness of the purification methods in a finished optical material. High-purity metal fluorides prepared by the methods presented herein will enable new high-performance optical materials for solid-state optical refrigerators, crystals for vacuum ultraviolet (VUV) spectroscopy of the Thorium-229 nucleus, VUV optics, fibers, and thin-film coatings.
