EFFECT OF K₂O AND MgO ON THE FORMATION AND HYDRATION ACTIVITY OF Ba-BEARING CALCIUM SULFOALUMINATE

Abstract

Ba-bearing calcium sulfoaluminate (C 2.75

Layered kagome compound Na2Ni3S4 with topological flat band

“…The A 2 Ni(Pd) 3 Ch 4 compounds are all highly insulating with a band gap of about 1 eV. [40,42,[44][45][46]48] Because the divalent nickel and palladium cations manifest a low spin configuration 3d 8 with S being 0, they in general demonstrate weak diamagnetic or paramagnetic signal. [46] However, it was reported that the Rb 2 Ni 3 S 4 specimens have a small residual ferromagnetic moment if they were soaked in water.…”

“…[46] However, it was reported that the Rb 2 Ni 3 S 4 specimens have a small residual ferromagnetic moment if they were soaked in water. [48] This unexpected ferromagnetism was attractive because it may be related to a long-sought flat-band ferromagnetism characteristic of the kagome lattice. [49] A recent study observed metalinsulator transition and superconductivity in Rb 2 Pd 3 Se 4 under high pressure.…”