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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. Thedoi:10.11938/cjmr20192755 doaj:ab488c31377945b4b2c9009fbfa60248 fatcat:nmlkoxdosbfrdb4b2lj3d7bbey