Ultrasonic measurement of the elastic constants of potassium hydrogen phthalate single crystals

Citation
Av. Alex et J. Philip, Ultrasonic measurement of the elastic constants of potassium hydrogen phthalate single crystals, J APPL PHYS, 88(5), 2000, pp. 2349-2351
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
88
Issue
5
Year of publication
2000
Pages
2349 - 2351
Database
ISI
SICI code
0021-8979(20000901)88:5<2349:UMOTEC>2.0.ZU;2-7
Abstract
Many organic crystals with orthorhombic symmetry exhibit electro-optic, fer roelectric, and triboluminescence properties. The potassium salt of phthali c acid (KAP), with the formula C8H5O4K, finds application in soft x-ray spe ctroscopy due to its large d spacing and has been reported to be piezoelect ric as well. KAP crystallizes into orthorhombic structure with space group Pca2(1) All nine elastic constants of KAP have been determined by measuring the velocity of longitudinal and transverse ultrasonic waves propagating a long different symmetry directions. Velocities have been measured by the ul trasonic pulse echo overlap technique by injecting waves generated by quart z transducers through a suitable bonding medium into the crystal. The McSki min Delta t correction has been applied to determine the velocities accurat ely. The temperature variation of selected elastic constants over the range 300-420 K has also been measured and reported. (C) 2000 American Institute of Physics. [S0021-8979(00)07315-1].