title: APSe6 (A = K, Rb, and Cs): Polymeric selenophosphates with reversible phase-change properties.
abstract: The ternary alkali selenophosphates KPSe6 and RbPSe6 crystallize in the polar orthorhombic space group Pca2(1) with a = 11.7764(17) A, b = 6.8580(10) A, c = 11.4596(16) A, and Z = 4 for RbPSe6. CsPSe6 crystallizes in the monoclinic space group P2/n with a = 6.877(3) A, b = 12.713(4) A, c = 11.242(4) A, beta = 92.735(7) degrees, and Z = 4. All compounds feature the one-dimensional infinite chain of [PSe2(Se)4-], where each P atom is connected with Se4(2-) bridge. These compounds show reversible glass-crystal transition, and 31P NMR data suggest that crystallization and infinite [PSe(6-)] chain formation are coupled processes.
authors.affiliation: Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: In
authors.initials: I
authors.lastname: Chung
authors.forename: Junghwan
authors.initials: J
authors.lastname: Do
authors.forename: Christian G
authors.initials: CG
authors.lastname: Canlas
authors.forename: David P
authors.initials: DP
authors.lastname: Weliky
authors.forename: Mercouri G
authors.initials: MG
authors.lastname: Kanatzidis