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Low-temperature synthesis of superparamagnetic Zn0.8Ni0.2Fe2O4 ferrite nanoparticles

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The crystalline nanoparticles of Ni0.2Zn0.8Fe2O4 ferrite were synthesized by chemical co-precipitation with precursor concentration of 0.1 M, then modified by 0.25 M solution of oleic acid in 1-pentanol and finally heated at low temperatures 120, 140, 160 and 180 oC for 6 h in autoclave. The effect of heating temperature on crystallite size and magnetic properties of ferrite was studied. The analysis of XRD, EDS and TEM data of samples confirmed that all of samples heated at these temperatures are crystalline with particle size of 6, 6.5, 7 and 8 nm, respectively. | Vietnam Journal of Science and Technology 56 (1) (2018) 31-38 DOI: 10.15625/2525-2518/56/1/9805 LOW-TEMPERATURE SYNTHESIS OF SUPERPARAMAGNETIC Zn0.8Ni0.2Fe2O4 FERRITE NANOPARTICLES Luong Thi Quynh Anh1, *, Nguyen Van Dan1, Do Minh Nghiep2 1 2 Department of Metallic Materials, Faculty of Materials Technology, HCMUT-VNUHCM, 268 Ly Thuong Kiet Street, ward 14, district 10, Ho Chi Minh City School of Materials Science and Engineering, Hanoi University of science and technology, 01 Dai Co Viet Street, Hai Ba Trung District, Ha Noi * Email: ltqanh@hcmut.edu.vn Received: 8 May 2017, Accepted for publication: 14 September 2017 Abstract. The crystalline nanoparticles of Ni0.2Zn0.8Fe2O4 ferrite were synthesized by chemical co-precipitation with precursor concentration of 0.1 M, then modified by 0.25 M solution of oleic acid in 1-pentanol and finally heated at low temperatures 120, 140, 160 and 180 oC for 6 h in autoclave. The effect of heating temperature on crystallite size and magnetic properties of ferrite was studied. The analysis of XRD, EDS and TEM data of samples confirmed that all of samples heated at these temperatures are crystalline with particle size of 6, 6.5, 7 and 8 nm, respectively. With the particles size below 10 nm, the nanoparticles of ferrite demonstrated the superparamagnetic properties, and could be applied effectively in various fields: medicine, treatment, military etc. The magnetic properties of Ni0.2Zn0.8Fe2O4 ferrite measured by vibrating sample magnetometer (VSM) showed that the coercive force Hc and the remanence Mr of samples are about zero while the saturation magnetization Ms has values of 14.2, 25.4, 26.8 and 27.1 emu/g, consequently. Keywords: crystalline nanoparticles, superparamagnetism (SPM). Zn0.8Ni0.2Fe2O4 ferrite, magnetic properties, Classification number: 2.2.1; 2.10.2. 1. INTRODUCTION The superparamagnetic nanoparticles of Zn-Ni-Fe ferrite system are used currently for special applications such as target-directed .