Abstract
Aluminum-substituted yttrium iron garnet (Al-YIG) nanostructured powders were synthesized using a citrate–nitrate gel combustion process. Atmospheric plasma-spray (APS) technique was employed to spray deposit the combustion derived feedstock powders. Nevertheless incongruently melting YIG resulted into a two-phase microstructure, Al-YIG powder resulted into a nanostructured garnet single phase when sprayed through thermal plasma. Room temperature saturation magnetization ( M S) and Curie temperature ( T C) of the Al-YIG powders decreased as a function of increasing Al content. As-sprayed YFe 3.8Al 1.2O 12 coating has a room temperature M S of 6.2 emu/cc and is increased to 7.3 emu/cc after post-deposition heat treatment at 1000 °C/1 h. Microstructural characteristics of single splats were analyzed in order to understand the feedstock effect on deposit.
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