An Ultrawide-Line 139La Solid-State NMR Investigation of Layered La(OH)2NO3

Layered rare earth hydroxides are new classes of functional materials. In this study, a layered La(OH)2NO3 compound having both ion-exchange capacity and non-linear optical property was studied by solid-state nuclear magnetic resonance (SSNMR) spectroscopy. The quadrupolar Carr-Purcell-Meiboom-Gill...

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Bibliographic Details
Published in:Bopuxue zazhi 2020-03, Vol.37 (1), p.76-85
Main Authors: FENG Zong-jing, DU Ya-ping, LUO Feng, XU Jun
Format: Article
Language:Chinese
Subjects:
139la solid-state nmr
layered compounds
qcpmg pulse sequence
quadrupole nucleus
ultrawide-line nmr spectrum
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Summary:Layered rare earth hydroxides are new classes of functional materials. In this study, a layered La(OH)2NO3 compound having both ion-exchange capacity and non-linear optical property was studied by solid-state nuclear magnetic resonance (SSNMR) spectroscopy. The quadrupolar Carr-Purcell-Meiboom-Gill sequence (QCPMG) was used to acquire 139La SSNMR sub-spectra with variable offsets, from which the ultrawide-line spectrum was reconstructed by co-addition after applying a filtering function. The ultrawide-line spectrum consisted of both center and satellite transition line shapes, which were also simulated with the QUEST software. The 139La CQ and ηQ values measured by SSNMR experiments agreed well with those calculated with the Cambridge Sequential Total Energy Package (CASTEP). The 139La SSNMR results unambiguously indicated that the layered La(OH)2NO3 compound studied belongs to a non-centrosymmetric space group of P21.
ISSN:1000-4556
1000-4556
DOI:10.11938/cjmr20192755