XPS O1s spectra were recorded for glasses in the binary PbO-Ga//2O//3 and ternary PbO-Bi//2O//3-Ga//2O//3 systems. Large shoulders with chemical shifts of 1.4 to 1.9 eV were observed in the O1s spectra recorded from PbO-Ga//2O//3 glasses. These shoulders were attributed to the presence of nonbridging oxygens in the structure. The shoulders indicated that, contrary to previous results, PbO was a network modifier as well as a charge compensator and network former. The additionof Bi//2O//3 reduced the number of nonbridging oxygens and, therefore, it was classified as an intermediate. Ga//2O//3 seemed to form GaO//4^- tetahedra, constituting the backbone of the network strcture. Glasses in the PbO-Bi//2O//3-Ga//2O//3 system had their IR cutoff edges located at 7?m with glass transition temperatures in the range of 320° to 400?.
Heo, Jong.?Kim, Choon Gon.?
Judd-Ofelt parameters ?//t with t=2,4,5 for the rare-earth ions Pr^3+, Nd^3+, Sm^3+, Tb^3+, Dy^3+, Ho^3+, Er^3+, and Tm^3+ in alkali and/or alkaline-earth silicate, borate, and phosphate glasses have been determined. The variations of ?//t with the number of 4f electrons of the rare-earth ions are demonstrated, and factors affecting the Judd-Ofelt parameter ?//6 are discussed. (more…)
Iwami, Tomoaki?Tadanaga, Kiyoharu?Tatsumisago, Masahiro?Minami, Tsutomu?Tohge, Noboru
CdS-doped SiO//2 glasses were prepared via silica gels containing diethyldithiocarbamatocadmium Cd(S//2CN(C//2H//5)//2)//2. Heat treatment of the gels gave transparent yellow SiO//2 glasses doped with hexagonal CdS crystals. In optical absorption and fluorescence spectra, the optical absorption edge and the emission peak clearly exhibited a blue shift, which was attributed to the quantum size effect (more…)
Peterson, Irene M.?Tseng-Ying Tien
The thermal expansion coefficients and glass transition temperatures of Y-Mg-Si-Al-O-N glasses were measured using dilatometry. The thermal expansion coefficients of these glasses could be calculated on the basis of composition, using experimetaly determined thermal expansion prefactors.
Zhang, Lipeng?Wang, Paul W.
The effect of chlorine on the structure of AlF//3/YF//3-based fluoride glasses was studied by XPS. The changes in the bonding state of cations with increase of chlorine content were all investigated by measuring the composition- dependent changes in the relative concentration and binding energy of related cations. (more…)
Heat absorbing glasses
The heat screen in a slide projector, or other type of light image projection apparatus, is a glass element or lens designed to transmit light to the film and to protect the film from the intense heat generated by the projection lamp or other light source. Indeed, these lenses can reach temperatures of 430.degree.C. and higher during operation of the projection unit. Such elements have commonly been made from thermally tempered, heat absorbing glasses which demonstrate relatively good transmission to radiation having wave lengths within the visible portion of the spectrum. (more…)
Todoroki, Shin-ichi?Sakaguchi, Shigeki
The Rayleigh scattering of silicate glasses (M//2O-RO-SiO//2, M: Na and K, R: Mg, Ca, and Zn) was measured. Soda magnesium silicate (NMS) glasses exhibited the smallest scattering intensity. It is comparable with that of soda aluminosilicate (NAS) glass, one of the candidates for use in fabricating ultralow- loss fibers. (more…)