In this research, strontium hexa-ferrite nanoparticles (SrFe12O19) were synthesized by sol-gel method. The crystal structure, morphology and magnetic properties of nanoparticles were investigated using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). The XRD patterns confirmed the formation of single phase M-type hexagonal crystal structure for powders which was calcined above 700oC. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 19, SOÁ K6- 2016 Synthesis of SrFe12O19 by sol-gel method and its morphology and magnetic properties Le Anh Bao Quynh Nguyen Hoang Vu Tran Thi Thuy Hoang Huynh Ky Phuong Ha Ho Chi Minh city University of Technology, VNU-HCM (Manuscript Received on July, 2016, Manuscript Revised on September, 2016) ABSTRACT In this research, strontium hexa-ferrite nanoparticles (SrFe12O19) were synthesized by hexagonal crystal structure for powders which was calcined above 700oC. The product shows sol-gel method. morphology and The crystal structure, magnetic properties of the magnetization of 66 emu/g, which is consistent with pure hexa-ferrite obtained by nanoparticles were investigated using X-ray other methods, and the magnetic coercivity of Diffraction Microscope (XRD), Scanning Electron (SEM) and Vibrating Sample 6,145 kOe higher than expected for this hexaferrite. The powder morphology is composed of Magnetometer (VSM). The XRD patterns confirmed the formation of single phase M-type aggregates of hexagonal particles with an average particles size of above 100nm. Keywords: Strontium hexa-ferrite, sol-gel method, magnetic material. 1. INTRODUCTION M-type hexagonal ferrites are important permanent magnetic materials which was widely technological applications such as permanent magnets, electrical and microwave devices, data studied since their discovery in the 1950s [1]. As a kind of hard magnetic material, the storage and recording, plastoferrites [1,2], RAM and microwave/EM wave absorption, magneto- hexagonal ferrite material efficiency has the chemical formula of MFe12O19 (M = Ba, Sr, electric (ME) and multiferroic (MF) application and a multitude of other applications [1]. Pb). Due to the magnetic properties and cost efficiency, hexa-ferrites was considered as a material with promising scientific and The formation of M-type hexagonal ferrites is an extremely complicated process, and the mechanisms .
