Nanocrystalline Sr2FeMoO6 prepared by citrate-gel method

: Raittila J, Salminen T, Suominen T, Schlesier K, Paturi P

Publisher: PERGAMON-ELSEVIER SCIENCE LTD

: 2006

Journal of Physics and Chemistry of Solids

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS

: J PHYS CHEM SOLIDS

: 67

: 8

: 1712

: 1718

: 7

: 0022-3697

DOI: https://doi.org/10.1016/j.jpcs.2006.03.009

Double perovskite Sr2FeMoO6 powders with small crystallite size have been synthesised with citrate-gel method. The starting solution pH was varied between 1.5 and 9.0 resulting in large differences in the phase composition and ordering of B'/B '' sites. The samples prepared at 975 degrees C had crystallite sizes under 40 nm whereas crystallite sizes of the samples prepared at 1050 degrees C were between 78 and 239 nm. The XRD patterns were refined with spacegroup I 4/m, which gave good results for both batches, although clearly better results were obtained with monoclinic P 2(1)/n spacegroup for the 975 degrees C batch. The ordering and the saturation magnetization agreed well with each other after treatment at 1050 degrees C, but the samples prepared at 975 degrees C had a strongly reduced saturation magnetization from that given by the ordering. (c) 2006 Elsevier Ltd. All rights reserved.