title: Yb9Zn4Bi9: extension of the Zintl concept to the mixed-valent spectator cations.
authors.affiliation: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Salvador
authors.forename: D
authors.initials: D
authors.lastname: Bilc
authors.forename: S D
authors.initials: SD
authors.lastname: Mahanti
authors.forename: M G
authors.initials: MG
authors.lastname: Kanatzidis