NMR Characterization of the Na(3)AlP(3)O(9)N and Na(2)Mg(2)P(3)O(9)N Nitridophosphates: Location of the (NaAl)/Mg(2) Substitution.
We report a solid state nuclear magnetic resonance study of (23)Na, (27)Al, and (31)P in two crystalline nitridophosphate phases, Na(3)AlP(3)O(9)N and Na(2)Mg(2)P(3)O(9)N, including two-dimensional multiple-quantum magic angle spinning (MQ-MAS) experiments on (23)Na to separate overlapping lines. The previously described single-crystal structure of Na(3)AlP(3)O(9)N gives crystallographic examples of Al(OP)(6) and P(O[Al,Na])(2)(ONa)(N[P,Na]) environments and three different environments of sodium: two Na(O)(6) and one Na(O)(6)(N). From these observations we characterize the modification of the local environment of phosphorus and show that Mg only substitutes Na in the Na2 site of the Na(2)Mg(2)P(3)O(9)N structure.
Massiot
Dominique
D
Centre de Recherche sur la Physique des Hautes Températures, CNRS, 45071 Orleans Cedex 2, France, Laboratoire de Chimie des Matériaux, URA 1496 CNRS (Verres et Céramiques), Université de Rennes I, Campus de Beaulieu, 35 042 Rennes Cedex, France, Institut für Chemie, Humboldt-Universität zu Berlin, Aussenstelle Berlin-Adlershof, 12484 Berlin, Germany.
Conanec
Roland
R
Feldmann
Walter
W
Marchand
Roger
R
Laurent
Yves
Y