Abstract
New layered magnetic materials,(MCl)Ca2Ta3O10 (M = Cu,Fe), have been prepared by ion-exchange reactions of non-magnetic perovskite derivatives,ACa2Ta3O10 (A = Rb,Li), in corresponding anhydrous molten salts. Powder x-ray diffraction patterns of theproducts are successfully indexed assuming tetragonal symmetry with cell dimensionsa = 3.829 Å andc = 15.533 Å for Cu,and a = 3.822 Å andc = 15.672 Å for Fe. Beingseparated by the Ca2Ta3O10 triple-layer perovskite slabs, the transition-metal chloride (MCl) network provides atwo-dimensional magnetic lattice. Magnetic susceptibility measurements show that(CuCl)Ca2Ta3O10 is in an antiferromagnetic state below 8 K, while(FeCl)Ca2Ta3O10 has two anomalies at 91 and 125 K, suggesting successive phase transitions due togeometrical spin frustration.
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