Quantitative identification of phonon modes controlling the multiphonon relaxation in heavy-metal oxide glasses
Identifieur interne : 000A26 ( Pascal/Checkpoint ); précédent : 000A25; suivant : 000A27Quantitative identification of phonon modes controlling the multiphonon relaxation in heavy-metal oxide glasses
Auteurs : YONG SEOP HAN [Corée du Sud] ; JAY HYOK SONG [Corée du Sud] ; Jong Heo [Corée du Sud]Source :
- Journal of the American Ceramic Society [ 0002-7820 ] ; 2004.
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Abstract
The phonon mode(s) controlling the multiphonon relaxation (MPR) in PbO-Bi2O3-Ga2O3 glass was analyzed, and the effect of GeO2 addition on the MPR process was investigated. MPR rates were obtained from the lifetimes of the Tm3+:3H4 level in glasses over the temperature range 20-280 K. In PbO-Bi2O3-Ga2O3 glass, phonons from the bending vibration between GaO4 tetrahedra (∼550 cm-') controlled the MPR process. On the addition of GeO2, the phonon mode at ∼770 cm-1 due to the stretching vibration of GeO4 tetrahedra started to affect the MPR process. Phonon modes controlling the MPR process in PbO-Bi2O3-Ga2O3-GeO2 glass were both 550 cm-1 and 770 cm-1.
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<front><div type="abstract" xml:lang="en">The phonon mode(s) controlling the multiphonon relaxation (MPR) in PbO-Bi<sub>2</sub>
O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
glass was analyzed, and the effect of GeO<sub>2</sub>
addition on the MPR process was investigated. MPR rates were obtained from the lifetimes of the Tm<sup>3+</sup>
:<sup>3</sup>
H<sub>4</sub>
level in glasses over the temperature range 20-280 K. In PbO-Bi<sub>2</sub>
O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
glass, phonons from the bending vibration between GaO<sub>4</sub>
tetrahedra (∼550 cm-') controlled the MPR process. On the addition of GeO<sub>2</sub>
, the phonon mode at ∼770 cm<sup>-1</sup>
due to the stretching vibration of GeO<sub>4</sub>
tetrahedra started to affect the MPR process. Phonon modes controlling the MPR process in PbO-Bi<sub>2</sub>
O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
-GeO<sub>2</sub>
glass were both 550 cm<sup>-1</sup>
and 770 cm<sup>-1</sup>
.</div>
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O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
glass was analyzed, and the effect of GeO<sub>2</sub>
addition on the MPR process was investigated. MPR rates were obtained from the lifetimes of the Tm<sup>3+</sup>
:<sup>3</sup>
H<sub>4</sub>
level in glasses over the temperature range 20-280 K. In PbO-Bi<sub>2</sub>
O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
glass, phonons from the bending vibration between GaO<sub>4</sub>
tetrahedra (∼550 cm-') controlled the MPR process. On the addition of GeO<sub>2</sub>
, the phonon mode at ∼770 cm<sup>-1</sup>
due to the stretching vibration of GeO<sub>4</sub>
tetrahedra started to affect the MPR process. Phonon modes controlling the MPR process in PbO-Bi<sub>2</sub>
O<sub>3</sub>
-Ga<sub>2</sub>
O<sub>3</sub>
-GeO<sub>2</sub>
glass were both 550 cm<sup>-1</sup>
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