Gallium Oxide Glasses

Baynton, P. L.; Rawson, Harold; Stanworth, J E

doi:10.1038/179434b0

Cited by 13 publications

(5 citation statements)

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“…It can either be a network modifier in silicate [10] or germanate [11,12] glasses or a network former or co-former in gallate, germano-gallate or gallo-phosphate glasses for instance [[13], [14], [15]]. Relatively few studies have been reported on glasses having gallium oxide as principal glass component [12,13,[15], [16], [17], [18], [19], [20], [21]], even though they may show good optical, mechanical and thermal properties for potential application from the visible to the mid-infrared (mid-IR) range. For better readability, a particular glass denomination formalism should be proposed to distinguish properly gallate glasses from gallate-based glasses.…”

Section: Introductionmentioning

confidence: 99%

Properties, structure and crystallization study of germano-gallate glasses in the Ga2O3-GeO2-BaO-K2O system

Skopak

Calzavara

Ledemi

et al. 2019

Journal of Non-Crystalline Solids

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Mid-infrared transparent germano-gallate glasses (with gallium oxide as main component) have been studied following the composition law (100-x)[48.3GaO3/2-32.2GeO2-19.5BaO]-xKO1/2 (with x = 0, 5, 10, 13, 17 mol%). All prepared glasses are transparent from approximately 280 nm up to 5.5 μm, with a measured linear refractive index and density decreasing respectively from 1.72 to 1.67 (at 1538 nm) and 4.79 to 4.34 g/cm 3 with increasing potassium oxide content. As expected, the increase of potassium oxide content also results in a decrease of the glass transition temperature (698 to 671 °C) and the viscosity in the softening regime whereas the thermal expansion coefficient increases (4.8 to 10.3 × 10 −6 K −1). These results are related to the depolymerization of the 3D interconnected glass network which has been studied by Raman spectroscopy. Large thermal stability criteria (difference between onset of crystallization and glass transition temperatures) ranging from 182 to 199 °C have been measured by DSC for the compositions containing potassium oxide, suggesting strong potential for fiber drawing from glass preforms. The 40.1GaO3/2-26.7GeO2-16.2BaO-17KO1/2 glass composition (in cation mol.%, which corresponds to 28Ga2O3-37GeO2-23BaO-12K2O in mol.%) was then selected for further investigation. Its mechanical properties (Young and shear moduli, Poisson's ratio, hardness) were measured, showing values close to those reported for well-known barium gallo-germanate (BGG) glasses. A thorough crystallization study was then carried out using DSC (Marotta's method), X-Ray diffraction and electron microscopies (TEM and SEM) to better understand the unexpected surface crystallization issues observed during the glass preform fiber drawing process. The potential of using such germano-gallate glasses to produce mid-infrared optical fiber of high mechanical strength is discussed.

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Section: Introductionmentioning

confidence: 99%

Properties, structure and crystallization study of germano-gallate glasses in the Ga2O3-GeO2-BaO-K2O system

Skopak

Calzavara

Ledemi

et al. 2019

Journal of Non-Crystalline Solids

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“…TeO 2 based glasses are the subject of many studies since the first reports of tellurite glasses by Stanworth and co-workers [1,2]. These materials have many characteristics that generate scientific and technological interest such as non-linear refractive index, high dielectric constant, low phonon energies among oxide glasses and low melting points (around 800 C, depending of composition) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Thermal, structural and optical properties of new TeO2Sb2O3GeO2 ternary glasses

et al. 2016

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In this work the novel glass system TeO 2 eSb 2 O 3 eGeO 2 was investigated and promising glass compositions were selected for further specific studies. Glass samples in the (80-0.8x)TeO 2-(20-0.2x)Sb 2 O 3 exGeO 2 molar composition were prepared by the melt-quenching method with a glass-forming domain from x ¼ 10 to x ¼ 90. Samples were investigated by XRD, DSC, FTIR, Raman spectroscopy and UVevisible absorption. The XRD and DSC results bring informations about the non-crystalline state and thermal properties of these materials. It has been observed that higher GeO 2 contents lead to higher glass transition temperatures and thermal stabilities against crystallization. FTIR and Raman spectroscopies suggest a progressive incorporation of GeO 2 in the covalent network of TeO 2 with conversion of structural units TeO 4 to TeO 3. Absorption spectra revealed the high visible transparency of these samples and an increase of the optical band gap with GeO 2 addition, in agreement with a decreasing polarizability of the glass network. Er 3þ doped and Er 3þ /Yb 3þ codoped samples were also studied with respect to their infrared emission properties and higher GeO 2 contents lead to an increase in IR emission intensity at 1,5 mm as well as longer radiative lifetimes. Finally, upconversion emission in the visible were also recorded and were shown to be strongly dependent of the composition.

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“…However, tellurite glasses have been the most attractive types for non-linear device applications, because TeO 2 one of the main constituents of these glasses. Recently, the first systematic studies on tellurite glasses, has been initiated by Stanworth and co-workers [1,2] and continued by Imaoka [3] and Vogel et al [4]. They determined the limits of the glass forming area for several binary and ternary systems and some of their optical properties as well.…”

Section: Introductionmentioning

confidence: 99%