An unusual O2−/F− distribution in the new pyrochlore oxyfluorides: Na2B2O5F2 (B = Nb, Ta)†
Edouard
Boivin, 
*a
Frédérique
Pourpoint,
a
Sébastien
Saitzek,
a
Pardis
Simon,
a
Pascal
Roussel
a
and
Houria
Kabbour
*a
*a
Frédérique
Pourpoint,
a
Sébastien
Saitzek,
a
Pardis
Simon,
a
Pascal
Roussel
a
and
Houria
Kabbour
*a
Abstract
Two new oxyfluorides with a pyrochlore-type structure, Na2Nb2O5F2 and Na2Ta2O5F2, have been obtained, for which the XRD crystallographic study coupled with 19F solid state NMR reveals an unusual O/F distribution. Both materials are n-type semiconductors exhibiting photoconductive properties.
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