Effect of B-Site Order–Disorder in the Structure and Magnetism of the New Perovskite Family La 2 MnB′O 6 with B′ = Ti, Zr, and Hf

DE PAOLI, JUAN M.

INORGANIC CHEMISTRY

AMER CHEMICAL SOC

Año: 2021 vol. 60 p. 4935 - 4935

0020-1669

n this work, we report the synthesis as well as thestructural and magnetic characterization of the three perovskitesLa2MnB′O6 (B′ = Ti, Zr, and Hf). Interestingly, only La2MnTiO6crystallizes in the monoclinic double perovskite space group P21/n, witha complete rocksalt order of the B-site cations, whereas La2MnZrO6 andLa2MnHfO6 crystallize in the orthorhombic simple perovskite space groupPbnm, with complete disorder in the B site. Moreover, the magneticsusceptibility at low temperatures shows clear antiferromagnetictransitions below 10 K for the three compounds, but only the Ti-basedperovskite has long-range magnetic ordering. The latter compound has anantiferromagnetic type-II structure described by the PS‑1 magnetic spacegroup, while the other two have a spin-glass behavior below the transitiontemperature due to both spin disorder and competing superexchangeinteractions in the systems. This is the first time that two of the threestudied compounds were synthesized (