title: Phase diagram of NdFeAsO(1-x)F(x): essential role of chemical composition.
abstract: In this Article, we provided the complete phase diagram of NdFeAsO(1-x)F(x) solid solution as a function of electron doping thanks to the careful determination of F- and O-content and phase content. We gave direct evidence of the source of F-depletion in the superconducting main phase, that is, the formation of oxyfluoride spurious phase. The approach reported in this work clearly showed that to give reliable results on these complex new superconducting materials, a rigorous control of the chemical composition of the considered phases has to be carried out.
authors.affiliation: Dipartimento di Chimica Fisica M. Rolla, INSTM (UdR Pavia) and IENI-CNR, Università di Pavia, Viale Taramelli 16, 27100 Pavia, Italy. lorenzo.malavasi@unipv.it
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Malavasi
authors.forename: Gianluca A
authors.initials: GA
authors.lastname: Artioli
authors.forename: Clemens
authors.initials: C
authors.lastname: Ritter
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Mozzati
authors.forename: Beatrice
authors.initials: B
authors.lastname: Maroni
authors.forename: Bholanath
authors.initials: B
authors.lastname: Pahari
authors.forename: Andrea
authors.initials: A
authors.lastname: Caneschi