Low-temperature elastic anomalies in an anthracene single crystal

Citation
M. Fukuhara et al., Low-temperature elastic anomalies in an anthracene single crystal, CHEM PHYS, 258(1), 2000, pp. 97-106
Citations number
38
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS
ISSN journal
03010104 → ACNP
Volume
258
Issue
1
Year of publication
2000
Pages
97 - 106
Database
ISI
SICI code
0301-0104(20000801)258:1<97:LEAIAA>2.0.ZU;2-Z
Abstract
Longitudinal and transverse wave velocities, elastic parameter (elastic con stants, Debye temperature and Gruneisen parameter), and dilational and shea r interval frictions were observed between room temperature and 137 K for a n anthracene single crystal, using an ultrasonic pulse method. We observed anomalies in transverse velocity, acoustic anisotropy factor, elastic param eters and internal frictions at 266 and 197 K. We also observed devitrifica tion, shrinkage of 0.86% and partial collapse after measurement. These resu lts suggest the possibility of a type I/type II phase transition from 181 K , caused by cooling and/or ultrasonic vibration. (C) 2000 Elsevier Science B.V. All rights.