Conditions Extrêmes et Matériaux : Haute Température et Irradiation
CEMHTI - UPR3079 CNRS
utilisateur non identifié |
Login
Home
Directory
Publications
Research
Facilities
Jobs - News
Access
Past members
CERAM - M.Allix
DEFIR - P.Desgardin
MatRMag - V.Montouillout
NAFMAT - C.Ania
OR2T - O.Rozenbaum
Common Actions
High-Temperatures Facility
Particles Beams Facilities
Vibr. Spectroscopies and Planex
NMR Facility
Softwares
National and European Facilities
all the instruments
Pelletron
Positons
Performances
IBA Techniques
Implantation and Irradiation
IR-RMN in Infranalytics
PANACEA Eu
850 MHz
Diffusion
NMR
dmfit NMR
focus (IR Optics)
Levitation
Electron Microscope
XRay and Neutrons
NMR
IR emission
RAMAN
Accelerators
RAMAN in situ
RAMAN high temp.
RAMAN imaging
News@CEMHTI
Jobs@CEMHTI
Seminars@CEMHTI
View CEMHTI Publication
Return to publication search...
Ask for a reprint
email :
I am not a bot ;-)
* Give your email
2008
ACL
doi
J.B.d'Espinose de Lacaillerie, C.Fretigny, D.Massiot
,
'MAS NMR spectra of quadrupolar nuclei in disordered solids: The Czjzek model'
, J. Magn. Reson. 192 244-251 (2008) doi:
10.1016/j.jmr.2008.03.001
Structural disorder at the scale of two to three atomic positions around the probe nucleus results in variations of the EFG and thus in a distribution of the quadrupolar interaction. This distribution is at the origin of the lineshape tailing toward high fields which is often observed in the MAS NMR spectra of quadrupolar nuclei in disordered solids. The Czjzek model provides an analytical expression for the joint distribution of the NMR quadrupolar parameters υQ and η from which a lineshape can be predicted. This model is derived from the Central Limit Theorem and the statistical isotropy inherent to disorder. It is thus applicable to a wide range of materials as we have illustrated for 27Al spectra on selected examples of glasses (slag), spinels (alumina), and hydrates (cement aluminum hydrates). In particular, when relevant, the use of the Czjzek model allows a quantitative decomposition of the spectra and an accurate extraction of the second moment of the quadrupolar product. In this respect, it is important to realize that only rotational invariants such as the quadrupolar product can make sense to describe the quadrupolar interaction in disordered solids.