The effects of heat treatment on the synthesis of nickel ferrite (NiFe2O4) nanoparticles using the microwave assisted combustion method

The effects of heat treatment temperatures on photocatalytic activity of cobalt ferrite nanoparticles synthesised by microwave‐assisted combustion method

“…In the X‐ray diffractograms given in Figure 4 for the samples prepared at various temperatures, the constructive effect of the applied heat treatment on the structure and transformation is clearly seen. Similar observations have been also reported in other studies in which spinel ferrite nanoparticles were synthesised by using the same method 36 …”

“…The final mixture was exposed to microwave irradiation for 5 min by applying 800 W of power in a kitchen type microwave oven. The reaction thought to occur in the furnace during this process is given in Equation 1 36 …”

“…The thermogravimetric curve of cobalt ferrite nanoparticles produced by microwave-assisted combustion method are relatively as expected and show great similarities with the thermal behaviour of other spinel materials synthesised by the same methods. 36 In the thermogravimetric curve presented in Figure 6, it is seen that there is a mass loss of approximately 9% in the material up to 700 C. Although there is relative thermal stability after 700 C, it is seen that there is a slight mass loss after about 1050 C. Mass losses observed during the TGA of the precursor sample can be examined in four separate regions. The initial mass loss starts at about 100 C and is probably due to dehydration.…”

“…Similar observations have been also reported in other studies in which spinel ferrite nanoparticles were synthesised by using the same method. 36 In the X-ray diffractogram (Figure 4) of the sample heat treated at 500 C, it is seen that the spinel structure starts to form. Moreover, at temperatures of 600 C and above, it is seen that the solid sample completely transforms into a spinel structured cobalt ferrite.…”

Optical and magnetic properties of monophasic cadmium ferrite (CdFe2O4) nanostructure prepared by thermal treatment method

“…Various methods for synthesizing spinel ferrite nanoparticles have been reported in the literature. Some of the best-known methods are solid state reaction [4], the sol-gel process [7], combustion synthesis [8], the sonochemical technique [9], the electrochemical method [10], hydrothermal method [11], precursor route [12], co-precipitation [13], micro-emulsions [14], reverse micelles [15], the solvo-thermal method [16], ball milling [17], and the microwave processing [18]. Factors and various precipitation agents were used to produce spinel ferrite 3 nanocrystals of specific sizes and shapes.…”