Phase Stability and Magnetic Properties of Compositionally Complex n = 2 Ruddlesden-Popper Perovskites.

ABSTRACT: Four new compositionally complex perovskites with multiple (four or more) cations on the B site of the perovskites have been studied. The materials have the general formula La_0.5Sr_2.5(M)₂O_7-δ (M = Ti, Mn, Fe, Co, and Ni) and have been synthesized via conventional solid-state synthesis. The compounds are the first reported examples of compositionally complex n = 2 Ruddlesden-Popper perovskites. The structure and properties of the materials have been determined using powder X-ray diffraction, neutron diffraction, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and magnetometry. The materials are isostructural and adopt the archetypal I4/mmm space group with the following unit cell parameters: a ∼ 3.84 Å, and c ∼ 20.1 Å. The measured compositions from energy dispersive X-ray spectroscopy were La_0.51(2)Sr_2.57(7)Ti_0.41(2)Mn_0.41(2)Fe_0.39(2)Co_0.38(1)Ni_0.34(1)O_7-δ, La_0.59(4)Sr_2.29(23)Mn_0.58(5)Fe_0.56(6)Co_0.55(6)Ni_0.42(4)O_7-δ, La_0.54(2)Sr_2.49(13)Mn_0.41(2)Fe_0.81(5)Co_0.39(3)Ni_0.36(3)O_7-δ, and La_0.53(4)Sr_2.55(19)Mn_0.67(6)Fe_0.64(5)Co_0.31(2)Ni_0.30(3)O_7-δ. No magnetic contribution is observed in the neutron diffraction data, and magnetometry indicates a spin glass transition at low temperatures.

SUBMITTER: Clulow R 

PROVIDER: S-EPMC11022176 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature