TITLE:
Y3Fe5O12 Prepared by Mechanosynthesis from Different Iron Sources
AUTHORS:
Claudia A. Cortés-Escobedo, Ana M. Bolarín-Miró, Félix Sánchez-De Jesús, Raúl Valenzuela, Elizabeth P. Juárez-Camacho, Iván L. Samperio-Gómez, Souad Ammar
KEYWORDS:
Mechanochemistry; YIG; Annealing; Iron Garnet
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.3 No.1A,
April
26,
2013
ABSTRACT: Yttrium iron garnet, Y3Fe5O12 (YIG) powders were synthesized by mechanochemical processing (MCP) from
different iron sources (FeO, Fe2O3 and Fe3O4)
mixed with Y2O3, followed by a heat treatment. The aim of
this work is to demonstrate that MCP followed by annealing at very low
temperatures (as compared with the classic solid state reaction) can induce the
formation of nanostructured YIG. The effect of iron source on final structure
was also studied. X-ray diffraction (XRD) and scanning electron microscopy
(SEM) were used to characterize the synthesized powders. The precursors
mixed in a stoichiometric ratio to obtain YIG were milled at room temperature
in a shaker mixer mill with a ball:powder weight ratio of 10:1. A partial
synthesis of YIG was achieved after 9 h of milling time by using the three
sources of iron; however, a significant fraction of the product was the perovskite
YFeO3. The largest yield of YIG was obtained by using FeO. In all
cases a single garnet phase could only be completely obtained after an
annealing process at 900?C, around 400?C lower than the typical temperatures to
prepare the material by solid state reaction. An analysis of the microstrain
and lattice parameters associated with peak displacements is discussed.