Asian Journal of Applied Sciences (ISSN: 2321 – 0893) Volume 07 – Issue 05, October 2019 Asian Online Journals (www.ajouronline.com) 637 Improving Magnetic Properties of BiFeO 3 -BaFe 12 O 19 Solid Solution by Different Sintering Time and Temperatures of Sol-Gel Method Dwita Suastiyanti 1,* , Yuli Nurul Maulida 2 and Marlin Wijaya 3 1 Mechanical Engineering Study Program-Institut Teknologi Indonesia Puspiptek Raya Street, Serpong, Tangerang Selatan, Banten, Indonesia 2 Chemical Engineering Study Program-Institut Teknologi Indonesia Puspiptek Raya Street, Serpong, Tangerang Selatan, Banten, Indonesia 3 Badan Pengkajian dan Penerapan Teknologi, Puspiptek - Indonesia Puspiptek Raya Street, Serpong, Tangerang Selatan, Banten, Indonesia * Corresponding author’s email: dwita_suastiyanti [AT] iti.ac.id _________________________________________________________________________________ ABSTRACT— Synthesis of BiFeO3-BaFe12O19 solid solution is aimed to enhanced magnetic properties of the material which can improve the quality of multiferroic properties of material. As we know that BiFeO3 is a multiferroic material if it is in single phase but unfortunately it is difficult to produce BiFeO3 in single phase, which can cause a large current leakage arising from non stoichiometric. It used sol gel method to produce BiFeO3- BaFe12O19 solid solution with weight ratio of 1;1. To know magnetic properties, it was used permagraph test which is type of MPS magnet – Physic EP3 – Permagraph L . The sintering temperature was 750, 800 and 850 o C for 8, 10 and 12 hours respectively. There is no regularity in increasing and decreasing of remanent and coersivity properties with increasing sinter temperatures and time of sintering but there is an increasing magnetic energy with increasing sinter temperatures and time of sintering. The highest value of magnetic energy, 10.716 GkA/m belongs to powder sintered at 850 o C for 12 hours. Keywords— magnetic properties, magnetic energy, sol-gel method _________________________________________________________________________________ 1. INTRODUCTION Multiferroic materials is an attractive material due to their potential application in electronic device (i.e. information storage, packaging materials, sensors, ultimate memory devices etc) [1]. The material will give electric voltage response if given an external magnetic field or will give magnetic response if given an external electric field or will give a plasticity response if given an external magnetic or electric field. Bismuth ferrite (BiFeO3) is a potential multiferroic material with ferroelectric and ferromagnetic properties at room temperature if it is in single phase. Unfortunately it is difficult to produce BiFeO3 in single phase, which can cause a large current leakage arising from non stoichiometric. BiFe03 has high Curie (Tc~830 °C) and Neel temperatures (TN~367 0c), has G type antiferromagnetic spiral spin perovskite structure (space group R3c) with aperiod of 62 nm [2,3]. The other problems of BiFe0 3 are dielectric loss, low dielectric constant and weak magnetic properties. H.Y. Dai et al. reported effect of BaTi03 doping on the structural, electrical and magnetic properties of BiFe03 ceramlcs [4]. Ren et al. reported comparative study of Mn 3+ and Mn 2+ doping effects on structure and electrical properties of BiFe03 thin film [5]. Liu et al. reported dielectric Characteristics in BiFe03-Modified SrTi03 incipient ferroelectric ceramics [6]. BaFe12019 is a ferromagnetic material and also permanent magnetic material. It is known as hexagonal M-type barium ferrite, M from the magnetite stone crystal structure name and the crystal structure belongs to the cubic hexahedral structure. The excellent properties of BaFe12019 among other are high frequency field, large saturation magnetization and high coercive force [7]. In this research, it is alloyed ceramics of BiFe03 and BaFe12019 together hoping to improve magnetic properties which could improve value of magnetoelectric coupling (related to higher quality of multiferroic materials). Increasing value of magnetic properties (magnetic energy) can also increase magnetoelectric coupling. So the problem solution to avoid large current leakage is to form ceramics of BiFeO3 – BaFe12O19 solid solution.