title: Structure and magnetism of the A site scandium perovskite (Sc0.94Mn0.06)Mn0.65Ni0.35O3 synthesized at high pressure.
abstract: Scandium perovskite (Sc0.94Mn0.06)Mn0.65Ni0.35O3, synthesized at high pressure and high temperature, has a triclinic structure (space group ) at room temperature and ambient pressure with a √2ap×√2ap×2ap structure with α≈90(°),β≈89(°),γ≈90(°). Magnetic measurements show that the material displays Curie-Weiss behaviour above 50 K with C=2.11 emu K mol(-1) (μeff=4.11 μB per formula unit) and θ=-95.27 K. Bond valence sum analysis of the crystal structure shows that manganese is present in three different oxidation states (+2, +3, +4), with the +2 oxidation state on the A site resulting in a highly tilted perovskite structure (average tilt 21.2(°) compared with 15.7(°) calculated for LaCaMnNbO6), giving the formula (Sc3+(0.94)Mn2+(0.06))(Mn4+(0.41)Mn3+(0.09))(Mn3+(0.15)Ni2+(0.35))O3.
authors.affiliation: Department of Chemistry, University of Liverpool, , Crown Street, Liverpool L69 7ZD, UK.
authors.forename: Chris I
authors.initials: CI
authors.lastname: Thomas
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Suchomel
authors.forename: Giap V
authors.initials: GV
authors.lastname: Duong
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Fogg
authors.forename: John B
authors.initials: JB
authors.lastname: Claridge
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Rosseinsky
keywords: ceramics; high-pressure phase; magnetic properties and crystal structure