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Quantitative Identification of Phonon Modes Controlling the Multiphonon Relaxation in Heavy‐Metal Oxide Glasses
Author(s) -
Han Yong Seop,
Song Jay Hyok,
Heo Jong
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2004.tb07742.x
Subject(s) - phonon , relaxation (psychology) , materials science , oxide , metal , atmospheric temperature range , bending , condensed matter physics , analytical chemistry (journal) , chemistry , thermodynamics , physics , composite material , metallurgy , psychology , social psychology , chromatography
The phonon mode(s) controlling the multiphonon relaxation (MPR) in PbO–Bi 2 O 3 –Ga 2 O 3 glass was analyzed, and the effect of GeO 2 addition on the MPR process was investigated. MPR rates were obtained from the lifetimes of the Tm 3+ : 3 H 4 level in glasses over the temperature range 20–280 K. In PbO–Bi 2 O 3 –Ga 2 O 3 glass, phonons from the bending vibration between GaO 4 tetrahedra (∼550 cm −1 ) controlled the MPR process. On the addition of GeO 2 , the phonon mode at ∼770 cm −1 due to the stretching vibration of GeO 4 tetrahedra started to affect the MPR process. Phonon modes controlling the MPR process in PbO–Bi 2 O 3 –Ga 2 O 3 –GeO 2 glass were both 550 cm −1 and 770 cm −1 .