Open AccessACOUSTIC PROPERTIES OF AMORPHOUS SUPERIONIC CONDUCTOR (AgI)x(Ag4P2O7)1-x
Author(s) -
Kun Wu,
Ding Yi,
Yu Wen-Hai
Publication year - 1988
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.37.57
Subject(s) - attenuation , materials science , attenuation coefficient , relaxation (psychology) , amorphous solid , condensed matter physics , acoustic attenuation , activation energy , atmospheric temperature range , nuclear magnetic resonance , thermodynamics , analytical chemistry (journal) , physics , optics , chemistry , crystallography , psychology , social psychology , organic chemistry , chromatography
Amorphous superionic conductor (AgI)x(Ag4P2O7)1-x system has been obtained by means of the liquid nitrogen rapid quenching technique. The ultrasonic attenuation and velocity of longitudinal and transverse sound waves in the samples for Agl with mol concentration x = 0.50, 0.60, 0.67, 0.75, 0.80 were measured in the temperature range 77-300 K at the frequency of 2, 5, 10, 15 MHz. An anomalous strong ultrasonic absorption peak is observed at a temperature around 200-240 K with the rharacteristics of relaxation attenuation evidently. The attenuation peak was found to shifts to lower temperature and the peak attenuation value increases with increasing Agl content. In the experimental temperature region the internal friction QM-1 of longitudinal and transverse waves in the samples is almost equivalent. In the course of attenuation measurements the sound velocity, elastic moduli at room temperature and the dependence of sound velocity on Agl content were also measured. The experimental data fit satisfactorily the unified theory of low frequency fluctuation, dissipation and relaxation process (i.e. infrared divergence response theory, briefly called as IDR) proposed by Ngai. The apparent activation energy and infrared divergence exponent of the samples were presented.