Magnetic Characteristics of BaFe12-2xCoxTixO19 Particles Prepared by Sol-gel Synthesis

,; ,; ,; ,; ,; ,; ,; ,

doi:2003.40.1.62

J. Korean Ceram. Soc. > Volume 40(1); 2003 > Article

Journal of the Korean Ceramic Society 2003;40(1): 62.
doi: https://doi.org/10.4191/kcers.2003.40.1.062

졸-겔 합성에 의한 BaFe_12-2xCo_xTi_xO₁₉ 미립자의 자기적 특성

최현승, 정지형, 박효열¹, 김태옥

부산대학교 재료공학부
¹한국전기연구원

Magnetic Characteristics of BaFe_12-2xCo_xTi_xO₁₉ Particles Prepared by Sol-gel Synthesis

ABSTRACT

Ba-ferrite particles added with Co and Ti, which were known well the additives for the control in coercivity, were synthesized by sol-gel method. In the range 90 to 120 minute reaction time, a stable sol solution which showed no change with temperature, pH, viscosity and aging time. After dried and heat treatment of sol solution, Ba-ferrite phase formed at $700^{circ}C$ with Differential Thermal Analysis(DTA) and X-Ray Diffractometer(XRD) measurement. The crystallinity became to be better with increasing the temperature. It were showed by Scanning Electron Microscopy(SEM) that Ba-ferrite increased to particle sizes as increasing heating temperature and obtained of narrow particles size distribution. Also, magnetic characteristics of Ba-ferrite powders Co and Ti added were observed by a Vibrating Sample Magnetometer(VSM). Saturation magnetization$(M_s)$ was not much changed, however. the coercivity$(H_c)$dramatically dropped with addition of Co and Ti.

Key words: Ba-ferrite, Sol-gel method, Saturation magnetization ($M_{s}$), Coercivity ($H_c$)