The Influence of Temperature and Time Sintering on Crystal Structure and Magnetic Properties of ore manganese and Mn- Ferrites Rosliana Eso
Universitas Halu Oleo
Abstract
This study aims to characterize magnetic properties and crystal structure of ore manganese and Mn-Ferites of ore manganese and irond sand from Buton Island, Indonesia. Ore manganese powder were sintering with temperature from 200 Celcius to 900 Celcius to find its magnetic properties by using susceptibility meter susceptibility Bartington MS2B. X-ray diffraction (XRD), X-ray Fluoresence (XRF) and a energy dispersive X-Ray Spectroscopy (EDX) were utilized in order to study the effect of variation temperature sinterring and its impact on crystal structure, chemical element and crystalline size of ore manganese and the ferrite powders formed. The result magnetic susceptibility in low frequencies (χ-LF) before heating were 26.8x10-8 m3/kg, and after heating from 200 to 700 Celcius were from 23.1 x10-8 m3/kg to 30.4 x10-8 m3/kg where confirms the paramagnetic properties, whereas in temperature 800-900 Celcius confirms anti ferromagnetic properties. The mineral of ore manganese was dominated by groutellite (MnO2) whice is an orthorhombic crystal structure, with lattice parameters a= 9.52 b= 2.86 c= 4.70. Meanwhile, for the 4000C sample, the dominant mineral is bixbyite (Mn2O3) with a cubic crystal structure, lattice parameter of a= 9.41 and density value of 5.034 gr/cm3. The XRD analysis showed that pure single phases of Mn ferrites were obtained by increasing the sintering temperature to 1050 Celcius
Keywords: Ore Manganese, Magnetic Susceptibility, and Mn-Ferrite
