Mechanochemical preparation and thermal stability of γ-Fe2O3 derived from γ-FeOOH

Synthesis and characterization of magnetic iron oxide nanoparticles via w/o microemulsion and Massart's procedure

“…There are a number of techniques to produce magnetic nanoparticles. Some of the methods used are impregnation [1], a special precipitation technique known as Masssart process [2], mechanical crushing of powder [3], sol-gel preparation [4] and usage of lauric acid as a non-aqueous medium [5]. The use of microemulsion is another promising preparation method for the formation of very small and uniform nanoparticles.…”

Preparation of Nanosized Hematite Particles by Mechanical Activation of Goethite Samples

“…[17][18][19][20][21][22][23][24] The formation of hematite by mechanical treatment of iron oxide hydroxides, namely, ␣-FeOOH, ␥-FeOOH, and ␦-FeOOH, has been described. [25][26][27][28][29][30][31][32] The products obtained by grinding have been characterized in terms of their composition under different experimental conditions. However, there is a lack of information about the morphology and texture of the intermediate and final products.…”

Facile and Low-Temperature Synthesis of γ-Fe2O3 Nanoparticles with Thermally Stable Ferrimagnetism for Use in Magnetic Recording Tapes

“…In contrast, a mechanochemical ball milling method was reported to lead to decomposition of γ-FeOOH to α-Fe 2 O 3 under air and γ-Fe 2 O 3 in hexane and cyclohexane media. 34 This is because γ-Fe 2 O 3 is just slightly (approximately 5 kJ mol −1 ) less stable than α-Fe 2 O 3 , 35 indicating that ϵ-FeOOH also could transform to γ-Fe 2 O 3 under a mild reaction condition. In this contribution, we adopted the dehydration reaction of ϵ-FeOOH in a lithium alkoxide solution, namely, LiOH•H 2 O in 2-phenoxyethanol.…”