An Insight into Formation Mechanism of Rapid Chemical Co-Precipitation for Synthesizing Yttrium Iron Garnet Nano Powders
writer：Junliang Liu, Qimei Jin, Shengyun Wang, Ping Yu, Chong Zhang, Clark Luckhardt, Zijuan Su, Radhika Ba
keywords：Yttrium iron garnet; Nanopowders; Chemical co-precipitation; Phase formation
source：期刊
specific source：Materials Chemistry and Physics
Issue time：2018年
The rapid chemical co-precipitation method is supposed to be a stable
way to synthesize high quality cubic yttrium iron garnet (YIG)
nanopowders. In this paper, focusing on clarifying its formation
mechanism, the thermal behaviors and the elemental distributions of the
chemical co-precipitated precursors have been analyzed by simultaneous
differential scanning calorimetry plus thermal gravimetric analysis
(DSC-TGA) and energy disperse spectroscopy (EDS) mapping technique on a
transmission electronic microscope. The results indicated that the
homogeneity of Y and Fe elemental distributions in the precursor powders
determines the process through which the cubic YIG phase would form:
one experiences the intermediate tetragonal YIG phase; the other takes
YFeO3 as the intermediate phase. The homogenous distributions
of Y and Fe elements in the precursor powders at the scale below 50?nm
forms the intermediate tetragonal YIG phase rather than YFeO3,
which leads to reduction of the formation temperature for synthesizing
the single phase YIG. The obtained YIG nanopowders with the average
particle size below 100?nm show excellent magnetic properties with
saturation magnetization of 26 emu/g and coercive field of 45?Oe. This
clear formation mechanism of YIG nanopowders is suitable for optimizing
the processing conditions for the chemical precipitation synthesis of
YIG nanopowders at large scale.