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Phase Stability and Magnetic Properties of Compositionally Complex n = 2 Ruddlesden-Popper Perovskites.
Inorganic Chemistry 2024 April 4
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 La0.5 Sr2.5 (M)2 O7-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 I 4/ 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 La0.51(2) Sr2.57(7) Ti0.41(2) Mn0.41(2) Fe0.39(2) Co0.38(1) Ni0.34(1) O7-δ , La0.59(4) Sr2.29(23) Mn0.58(5) Fe0.56(6) Co0.55(6) Ni0.42(4) O7-δ , La0.54(2) Sr2.49(13) Mn0.41(2) Fe0.81(5) Co0.39(3) Ni0.36(3) O7-δ , and La0.53(4) Sr2.55(19) Mn0.67(6) Fe0.64(5) Co0.31(2) Ni0.30(3) O7-δ . No magnetic contribution is observed in the neutron diffraction data, and magnetometry indicates a spin glass transition at low temperatures.
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