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A 12-layer hexagonal perovskite Ba4SbMn3O12 (space group: R3̄m; a = 5.72733(3) Å, and c = 28.1770(3) Å) has been synthesized by high-temperature solid-state reactions and studied using powder X-ray and… Click to show full abstract
A 12-layer hexagonal perovskite Ba4SbMn3O12 (space group: R3̄m; a = 5.72733(3) Å, and c = 28.1770(3) Å) has been synthesized by high-temperature solid-state reactions and studied using powder X-ray and neutron diffraction and magnetization measurements. This 12R polytype structure contains one corner-sharing (Sb, Mn)O6 octahedron and a trimer of face-sharing MnO6 octahedra per formula unit. Ba4SbMn3O12 displays a paramagnetic state of the Mn3 magnetic cluster at 100–200 K, which partially disassociates into individual Mn ions at 250–300 K. The ferromagnetic interaction between these Mn3 clusters is mainly mediated by Mn3+ at the M1 site, leading to dynamic ferromagnetic clusters below TD = ∼70 K and ferromagnetic spin freezing transition at Tg = ∼11.5 K. The stability of Mn3 magnetic clusters in the 12R polytypes is related to the intracluster Mn–Mn distance.
Journal Title: RSC Advances
Year Published: 2023
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