Abstract
Fine powders with nominal composition of GeFe2Ox were synthesized by the aerogel method. The highly heterogeneous material comprises of small crystallites, not larger than 3 nm, in a mixture of amorphous matrix. Nevertheless, Mossbauer spectroscopy indicates that the Fe ions in many different environments in the calcined product undergo simultaneously an antiferromagnetic transition near 265 K. (C) 1998 Elsevier Science B.V. All rights reserved.