Piezoelectric signal suppression by a composite-pulse sequence in NMR

摘要

Numerous NMR techniques are available for the study of nuclei with spin 1>=1.These nuclei interact with their surrounding electric field gradient,which depends on the symmetry of the crystallographic site.Spurious(or piezoelectric)signals,due to the piezoelectric and ferroelectric properties of a LiNbO3 crystal and generated by the vibration of the macroscopic electric dipole of the crystal,have been observed with the one-pulse sequence and cancelled using a composite-pulse sequence.The suppression of these piezoelectric signals by this sequence is illustrated by lithium-7(/=3/2)nuclei.Java applets available in our web site www.pascal-man.com for the determination of quadrupole parameters from one-dimensional nutation method are also presented.To cite this article:C.Mignon et al,C.R.Chimie 7(2004).