Properties of Yttria‐Aluminoborate Glasses

Abstract

In the Y2O3-AI2O3-B2O3 system, homogeneous glasses were obtained from compositions containing from 50 to 65 mol% B203. The density, refractive index, and thermal expansion increase as Y 2 0 3 replaces either B2O3 or AI203. These glasses have a dilatometric softening temperature above W C , and below 300°C their dc electrical resistivity exceeds that of fused silica. The infrared absorption spectra indicate that B03, B04, and AIO, groups are present in these glasses.[

Luminescent and thermo-optical properties of Nd3+-doped yttrium aluminoborate laser glasses

“…In the Nd:YAlB glasses, Y 3+ cations are located in highly coordinated polyhedra surrounded by borate groups as they act as a glass modifier. 11 This assumption is in good agreement with the modifier role of La 3+ cations in aluminoborate glasses, where La 3+ are stabilized in borate-rich environments at a constant ratio of 1La:3B with a local range order close to that of lanthanum metaborates: La 3+ is bonded to two three-fold trigonal boron ͑BO 3 ͒ and one four-fold tetrahedral boron ͑BO 4 ͒ − .…”

“…They found that YAlB glasses melted between 1100 and 1550°C cannot be formed when yttria or alumina concentrations are less than 10 mol %, while compositions containing less than 65 mol % boron oxide were outside the immiscibility gap and homogeneity. Homogeneous glasses containing up to 25 mol % yttria and 35 mol % alumina have been prepared between 1300 and 1570°C by Rutz et al 11 More recently, Rocherullé and co-workers 12,13 obtained transparent and homogeneous glasses for a boron oxide content in the range from 35 to 65 mol % by melting the former oxides between 1600 and 1800°C under nitrogen atmosphere. As a general feature, YAlB glasses are nonhygroscopic and present high chemical stability due to the presence of aluminum glass forming ions.…”

“…As a general feature, YAlB glasses are nonhygroscopic and present high chemical stability due to the presence of aluminum glass forming ions. 11,14 Another important disadvantage of YAB crystals is the heat generation. For instance, Jaque et al 15 showed a decrease both in the emitted infrared laser power at 1.06 m and in the second harmonic generation, relating this performance deterioration to heating effects.…”

“…The trend toward crystallization increases with the Y 2 O 3 content. 11 Ground state absorption, photoluminescence, excited state lifetime measurements, and the thermal lens ͑TL͒ technique were used to evaluate the optical and thermo-optical properties of this very promising material. Netzsch STA 409 analyzer.…”

Characterization of the glass-to-vitroceramic transition in yttrium aluminum borate laser glasses using solid state NMR

“…By high-temperature annealing these glasses can be converted to vitroceramics, which offer the distinctive advantage of presenting higher emission cross-sections owing to the more ordered local crystalline environment. While the preparation conditions, the glass forming range, as well as some basic bulk and spectroscopic properties of Y 2 O 3 -Al 2 O 3 -B 2 O 3 glasses have been published [7][8][9][10][11] no corresponding structural description of the vitroceramics derived from them is as yet available. Owing to its element-selectivity, inherently quantitative character and its focus on the local environment, solid state nuclear magnetic resonance (NMR) is an ideal tool for structural investigation of vitroceramics, and numerous applications of single-and double resonance applications to glass ceramics can be found in the literature [12][13][14][15][16][17].…”