The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

Abstract

Abstract:We present a comparison for the effect of condensation on the morphology and magnetic properties of oleic acid modified BaFe12O19 nanoparticles. Two different samples of BaFe12O19 nanoparticles were synthesized by dehydration (Z1) and rotary evaporation (Z2) method, respectively. Oleic acid was used as the surface modification agent to observe the morphological and magnetic changes. The nanoparticles were analyzed by XRD, FTIR, TGA, SEM, and VSM techniques for structural and physicochemical characteristics. Crystallographic analysis reveals the phase as hexaferrite and the average crystallite size of Z1 and Z2 is 21±3 nm and 17±2 nm, respectively. Rotary evaporator accelerates the condensation process in viscous gel (Z2). Due to the use of rotary evaporator, the coating with oleic acid for Z2 product has been accomplished very well, as compared with Z1. As a result, saturation magnetization of Z2 sample is much lower than that of Z1 sample.

Effect of annealing temperature on structural and magnetic properties of strontium hexaferrite nanoparticles synthesized by sol–gel auto-combustion method

“…Similar behavior was observed by Durmus et al for barium hexaferrite. 36 Together with the results from the TG/DTG analysis, now we can conclude that the organic compounds were eliminated above 900 • C and bonds between metals and oxygen were formed. Effect of annealing temperature on properties of SrFe 12 O 19 indicates that annealing at 900 • C was not quite enough to obtain single phase hexagonal crystal structure.…”

Sol–gel auto combustion synthesis of BaFe12O19 nanoceramics by using carbohydrate sugars as a novel reducing agent

“…It should be noted that the pure phase of BaFe 12 Fig.3b-d. This result implied that maltose (carbohydrate sugars) is more suitable fuel than other type one, such as oleic acid, and citric acid [19,20]. The sample No.…”

Rietveld refinement, electrical properties and magnetic characteristics of Ca–Sr substituted barium hexaferrites

“…In order to reduce the particle size, other methods have also been investigated such as aerosol pyrolysis, sol-gel, chemical co-precipitation, dehydration and rotary evaporation method etc. [8]. However, these methods are more complex and expensive than the ceramic method [9].…”