MOSSBAUER STUDY OF THE PLANAR ANTIFERROMAGNET FETA2O6

We report on Mossbauer spectroscopy study of magnetic ordering in FeTa 2O6. At temperatures above 10 K, the compound is paramagnetic; the spe ctrum obtained at 10 K shows a very asymmetric doublet, suggesting the onset of the magnetic ordering; between 9.75 K and 4.2 K the spectra consist of magnetic components. The temperature dependence of the subl attice magnetization, as determined from Mossbauer measurements, quali tatively resembles that calculated for the two-dimensional Ising model .