title: Synthesis, structures and magnetic properties of the dimorphic Mn2CrSbO6 oxide.
abstract: The perovskite polymorph of Mn(2)CrSbO(6) compound has been synthesized at 8 GPa and 1473 K. It crystallizes in the monoclinic P21/n space group with cell parameters a = 5.2180 (2) Å, b = 5.3710(2) Å, c = 7.5874(1) Å and β = 90.36(1)°. Magnetic susceptibility and magnetization measurements show the simultaneous antiferromagnetic ordering of Mn(2+) and Cr(3+) sublattices below TN = 55 K with a small canting. Low temperature powder neutron diffraction reveals a commensurate magnetic structure with spins confined to the ac-plane and a propagation vector κ = [1/2 0 1/2]. The thermal treatment of this compound induces an irreversible phase transition to the ilmenite polymorph, which has been isolated at 973 K and crystallizes in R3[combining macron] space group with cell parameters a = 5.2084 (4) Å and c = 14.4000 (11) Å. Magnetic susceptibility, magnetization and powder neutron diffraction data confirm the antiferromagnetic helical ordering of spins in an incommensurate magnetic structure with κ = [00 0.46] below 60 K, and the temperature dependence of the propagation vector up to κ = [00 0.54] at about 10 K.
authors.affiliation: Departamento de Ingeniería Mecánica, Química y Diseño Industrial, E.T.S.I.D.I, Universidad Politécnica de Madrid, 28012, Spain. aj.dossantos@upm.es.
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Dos santos-García
authors.forename: Elena
authors.initials: E
authors.lastname: Solana-Madruga
authors.forename: Clemens
authors.initials: C
authors.lastname: Ritter
authors.forename: David
authors.initials: D
authors.lastname: Ávila-Brande
authors.forename: Oscar
authors.initials: O
authors.lastname: Fabelo
authors.forename: Regino
authors.initials: R
authors.lastname: Sáez-Puche