Structure of lead germanate glasses by Raman spectroscopy

Сигаев, В. Н.; Gregora, I.; Pernice, P.; Champagnon, B.; Smelyanskaya, E. N.; Aronne, Antonio; Саркисов, П. Д.

doi:10.1016/s0022-3093(00)00410-5

Cited by 70 publications

(36 citation statements)

References 38 publications

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“…The highest-frequency Raman band of the tellurite fiber is at 750 cm −1 and is composed of two peaks attributed to Te-O stretching vibrations [34] . The position of the highest-frequency Raman bands agrees with other tellurite and lead-germanate glasses [19,[34][35][36][37].…”

Section: Raman Spectrasupporting

confidence: 81%

Lead-germanate glasses and fibers: a practical alternative to tellurite for nonlinear fiber applications

Munasinghe

Winterstein-Beckmann

Schiele

et al. 2013

Opt. Mater. Express

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Section: Raman Spectrasupporting

confidence: 81%

Lead-germanate glasses and fibers: a practical alternative to tellurite for nonlinear fiber applications

Munasinghe

Winterstein-Beckmann

Schiele

et al. 2013

Opt. Mater. Express

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“…A band of 250 cm -1 emerges in Phase A2 while it is absent in Phase A1. The most intense band in the amorphous material (Phase A2) is at 124 cm -1 , which is assigned as symmetric stretching vibrations of Pb-O either in square pyramids or in trigonal pyramids with Pb atoms in the apex (Sigaev et al 2001); while in Phase A1 we observe two partially overlapping bands at 117 and 132 cm -1…”

Section: Resultsmentioning

confidence: 80%

A new cubic perovskite in PbGeO3 at high pressures

Xiao

Zhou

Chen

et al. 2012

American Mineralogist

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A new cubic perovskite polymorph of PbGeO 3 (Phase II) was synthesized by laser heating in the diamond-anvil cell (DAC) at the pressure of 36 GPa. Fitting the Birch-Murnaghan equation of state against its observed P-V data yields a bulk modulus K 0 of 196(6) GPa and the volume V 0 of 56.70(13) Å 3 when K 0 ′ is assumed being 4. After the pressure is released, the PbGeO 3 Phase II changes gradually into an amorphous phase, which contains mainly fourfold-coordinated germanium. It indicates that the PbGeO 3 Phase II with a GeO 6 octahedron framework transforms to a GeO 4 tetrahedron network during the amorphization. The existence of PbGeO 3 cubic perovskite Phase II at high pressures indicates that the polarized character of the Pb 2+ ion induced by its 6s 2 lone pair electrons would be totally reduced in the environment of major silicate perovskites inside the lower mantle, and thus the Pb atom would substitute the Ca atom to enter the CaSiO 3 perovskite.

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“…It can be seen that as the PbO content increases the absorption bands attributed to bismuth tend to decrease in strength. This might occur because the addition of PbO may permit the bismuth dopant to be incorporated as a structural component of the glass, rather than an optically active ion, since many authors have proposed a structural similarity between lead-rich and bismuth-rich glasses [21]. It is also noted that the transparency of the glass increases with an increasing PbO content.…”

Section: Resultsmentioning

confidence: 99%

Advanced bismuth-doped lead-germanate glass for broadband optical gain devices

2008

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We fabricated a series of glasses with the composition 94.7-GeO 2 -5Al 2 O 3 -0.3Bi 2 O 3 -PbO ͑ =0-24 mol. %͒. Characteristic absorption bands of bismuth centered at 500, 700, 800, and 1000 nm were observed. Adding PbO was found to decrease the strength of bismuth absorption. The addition of 3%-4% PbO resulted in a 50% increase in lifetime, a 20-fold increase in quantum efficiency, and a 28-fold increase in the product of emission cross section and lifetime on the 0% PbO composition. We propose that the 800 nm absorption band relates a different bismuth center than the other absorption bands.

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Structure of lead germanate glasses by Raman spectroscopy

Cited by 70 publications

References 38 publications

Lead-germanate glasses and fibers: a practical alternative to tellurite for nonlinear fiber applications

Lead-germanate glasses and fibers: a practical alternative to tellurite for nonlinear fiber applications

A new cubic perovskite in PbGeO3 at high pressures

Advanced bismuth-doped lead-germanate glass for broadband optical gain devices

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