การเตรียมผงผลึกเฟร์โรแมกเนทริกที่มีขนาดเล็กของ Y2.7Bi0.3Fe4.7Mn0.3O12 ที่มีประสิทธิภาพสูง ด้วยวิธีการเผาไหม้ของแข็ง

Abstract

In this study, the effects of calcinations temperature (850-1150oC for 2 h) on the phase formation, microstructure and magnetic properties of the Y2.7Bi0.3Fe4.7Mn0.3O12 powders. The powders were prepared by combustion technique. Glycine was used as fuel to reduce the reaction temperature. The crystal structure, microstructure, and magnetic properties of the powders were studied. It was found that the pure Y2.7Bi0.3Fe4.7Mn0.3O12 powder was observed in the sample calcined at 1100oC for 2 h. The Y2.7Bi0.3Fe4.7Mn0.3O12 powders belonged to cubic garnet phase. The microstructure of the Y2.7Bi0.3Fe4.7Mn0.3O12 powders exhibited an irregular shape and an agglomerated form. The average particle size of all powders showed in the range of 0.38-1.98 µm. The pure Y2.7Bi0.3Fe4.7Mn0.3O12 powder calcined at 1100oC for 2 h exhibited Ms and Mr at measured temperature of 300 K which were about 26.4 and 2.1 emu/g, respectively.