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Anomalous Behavior of Ultrasonic Velocity in Rubidium Borate Glasses
Author(s) -
Kodama Masao
Publication year - 1991
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.1151-2916.1991.tb06807.x
Subject(s) - rubidium , boron , ultrasonic sensor , materials science , oxygen , analytical chemistry (journal) , anomaly (physics) , boron oxide , dilation (metric space) , mineralogy , chemistry , condensed matter physics , potassium , metallurgy , physics , organic chemistry , acoustics , mathematics , combinatorics
By use of the ultrasonic pulse echo overlap method, ultrasonic velocity in rubidium borate glasses is measured as a function of composition at a temperature of 298 K, which is found to exhibit a maximum, a minimum, and another maximum in succession as the rubidium oxide content increases. This behavior is remarkable among the borate anomalies. The elastic property of these glasses is analyzed in terms of the three structural units defined as BØ 3 , Rb + BØ 2 O − , and Rb + BØ − 4 , where Ø represents a bridging oxygen and O − a nonbridging oxygen, from which the cause of this anomalous behavior is elucidated.