LOW-TEMPERATURE, FLUX-GROWN, NA-DOPED LAMNO3 - MAGNETIC-PROPERTIES

Crystalline powders of Na-doped LaMnO3 have been precipitated from mol ten sodium hydroxide at 450 degrees C. Elemental analysis by wavelengt h dispersive spectroscopy indicates than Na substitutes for Mn giving LaMn1-xNaxO3-delta, with x=0.2. The pseudocubic lattice parameter of 3 .916 Angstrom is larger than that of the undoped material, consistent with substitution at the Mn site. Analysis of magnetic susceptibility gives a ferromagnetic Curie-Weiss temperature of 130 K, which is to be compared with the onset of weak ferromagnetism near 300 K. Low-temper ature magnetization measurements suggest a model of canted antiferroma gnetic clusters. (C) 1997 American Institute of Physics.