Premium
17 O NMR in room temperature phase of La 2 Mo 2 O 9 fast oxide ionic conductor
Author(s) -
Emery Joel,
Massiot Dominique,
Lacorre Philippe,
Laligant Yvon,
Conder Kasik
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1555
Subject(s) - chemistry , magic angle spinning , ionic conductivity , phase (matter) , oxygen , magic angle , ionic bonding , phase transition , oxide , plastic crystal , conductor , analytical chemistry (journal) , nmr spectra database , crystallography , nuclear magnetic resonance spectroscopy , ion , spectral line , thermodynamics , stereochemistry , materials science , physics , organic chemistry , electrode , electrolyte , composite material , chromatography , astronomy
A room temperature 17 O NMR study of La 2 Mo 2 O 9 , a fast oxide ionic conductor exhibiting a phase transition at 580 °C between a low‐temperature α‐phase and a high‐temperature β‐phase, is presented. Four partly overlapping quasi‐continuous distributions of oxygen sites are evidenced from 1D magic angle spinning (MAS) and 2D triple quantum MAS NMR experiments. They can be correlated with the three oxygen sites O1, O2 and O3 of the high‐temperature crystal structure. The low‐temperature phase is characterized by two distributed sites of type O1, which proves that the symmetry is lower than in the cubic high‐temperature phase. Two‐dimensional experiments show that there is no dynamic exchange process, on the NMR time‐scale, between the different oxygen sites at room temperature, which agrees well with conductivity results. Copyright © 2005 John Wiley & Sons, Ltd.