การสังเคราะห์ผงผลึกแม่เหล็ก Y2.7Bi0.3Fe4.7Mn0.3O12 ที่มีค่าแมกนีไตเซชันสูง  ด้วยวิธีการเผาไหม้ของแข็งอย่างง่าย

Chittakorn  Kornphom; Nichanan Wongyai; Nattapong Tanon; Supree  Pinitsoontorn; Theerachai Bongkarn

Authors

Chittakorn Kornphom Department of General Sciences and Physics, Faculty of Science and Technology, Chiang Mai Rajabhat University
Nichanan Wongyai Department of General Sciences and Physics, Faculty of Science and Technology, Chiang Mai Rajabhat University
Nattapong Tanon Department of General Sciences and Physics, Faculty of Science and Technology, Chiang Mai Rajabhat University
Supree Pinitsoontorn Department of Physics, Faculty of Science, Khon Kaen University
Theerachai Bongkarn Department of Physics, Faculty of Science, Naresuan University

Keywords:

Y2.7Bi0.3Fe4.7Mn0.3O12, solid state combustion technique , phase formation , magnetic property

Abstract

In this work, the preparation high magnetization of magnetic powders were studied and the effects of calcination temperature (850-1150^oC for 2 h) on the crystal structure, microstructure and magnetic properties of the Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powders were investigated. The powders were synthesized by simplified combustion technique. Glycine was used as fuel. The crystal structure, microstructure, and magnetic properties of the powders were studied. It was found that the Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powders showed garnet structure with cubic and the pure Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powder was observed from the sample calcined at 1100^oC for 2 h. The microstructure of the Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powders exhibited an almost spherical shape and an agglomerated form. The average particle size increased from 0.38 ± 0.10 to 1.98 ± 0.62 mm when calcination temperature increased from 850 to 1050^oC. The particle of powders were melted when calcination was higher temperature (1100-1150 ^oC for 2 h). The M_s value of Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powders with measuring at temperatures of 300 and 50 K increased when calcination temperature increased. For the M_rvalue of Y_2.7Bi_0.3Fe_4.7Mn_0.3O₁₂ powders, it was found that the change of the M_rvalue was no significant when the calcination temperature increased.

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