tailieunhanh - Study on influence of temperature and duration of hydrothermal treatment to properties of nano ferrite NiFe2O4 materials
NiFe2O4 superparamagnetic nanoparticles have been prepared by the method of spraying - co-precipitation subsequent by hydrothermal treatment. This procedure allowed to produce efficiently nanoparticles with high performances. Different techniques such as XRD, TEM, EDX, VSM were used to investigate the morphology, structure and magnetic properties of the obtained materials. | Journal of Science and Technology 54 (1A) (2016) 1-8 STUDY ON INFLUENCE OF TEMPERATURE AND DURATION OF HYDROTHERMAL TREATMENT TO PROPERTIES OF NANO FERRITE NiFe2O4 MATERIALS Tran Quang Dat *, Pham Van Thin, Do Quoc Hung Le Quy Don Technical University, 236 Hoang Quoc Viet Street, Ha Noi * Email: dattqmta@ Received: 30 August 2015; Accepted for publication: 29 October 2015 ABSTRACT NiFe2O4 superparamagnetic nanoparticles have been prepared by the method of spraying co-precipitation subsequent by hydrothermal treatment. This procedure allowed to produce efficiently nanoparticles with high performances. Different techniques such as XRD, TEM, EDX, VSM were used to investigate the morphology, structure and magnetic properties of the obtained materials. It is shown that the materials have face-centered cubic trevorite structure, and their degree of crystallinity and magnetic properties improved with increasing temperature and time of hydrothermal treatment. After 32 hours of hydrothermal treatment at 160 C, NiFe2O4 nanomaterial has particle size of about 23 nm and saturation magnetization (Ms) of 49 emu/g. Keywords: ferrite, hydrothermal, co-precipitation, NiFe2O4. 1. INTRODUCTION Hydrothermal treatment is an effective technological method for the synthesis of nanomaterials, including nano magnetic ones [1]. On the other hand, the interest in the spinel ferrites MFe2O4 (M: Ni, Mn, Zn, Cu.) for many applications greatly increased in recent years due to their unique ability to respond to the action of external magnetic fields [2]. Among the ferrites, NiFe2O4 has great advantages, namely low cost of manufacturing, abundance of resources of raw materials, stability of properties to the environment and because of that this material is widely used in particularity for absorption, extraction and catalysis [3 - 5]. There are many technological methods for the synthesis of NiFe2O4 magnetic nanoparticles, such as grinding, micro-emulsion, ultrasonic and .
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