A closer look at the synthesis and formation mechanism of hematite nanocubes

Microwave Gas Sensing with Hematite: Shape Effect on Ammonia Detection Using Pseudocubic, Rhombohedral, and Spindlelike Particles

“…Pseudocubes are one of the most studied hematite morphologies, in particular in their monocrystalline form. − The “pseudocubic” terminology is due to a few degrees difference in the polyhedron angles with respect to those of a perfect cube (86° and 94° instead of 90°) . This broad interest is explained by the fact that an actual cubic monocrystalline morphology is not allowed by the rhombohedral lattice system of hematite ( R 3̅ c ), unlike pseudocubes which are directly related to rhombohedrons.…”

“…Numerous synthesis protocols have been described, and implement a large variety of solvents, precursors and additives that are supposed to guarantee a low dispersion in size of the resultant particles. 29−35 This wide range of experimental conditions has led to a wide range of submorphologies, such as polycrystalline pseudocubes, 30,31 monocrystalline pseudocubes, 32,33 pseudocubes with rounded edges, 34 or pseudocubes with well-faceted faces and sharp edges. 35,36 However, it has been shown that monodisperse and monocrystalline particles are obtainable with ferric chloride (FeCl 3 ) as precursor and without any additive, especially in microwave thermohydrolysis conditions.…”

Precipitation of α-Fe2O3 and recovery of Ni and Co from synthetic laterite-leaching solutions

“…The products obtained after 2 h contained only α-Fe 2 O 3 , shown by the corresponding XRD pattern, suggesting that the reaction period had considerable effect on the amount and composition of the products. For the cases of Fe precipitation at temperatures above 100°C, the reaction time was an important parameter in determining whether akaganéite or hematite was formed (Malik et al, 2014;Štajdohar et al, 2013). Table 2 shows the full width at half maximum (FWHM) of different XRD patterns.…”

Preparation, properties, and applications of magnetic hematite microparticles

“…Including the synthesis of hematite spindles or nanocubes that can be obtained with the forced hydrolysis synthesis at low concentrations of FeCl 3 (0.01-0.02 M). 33,[41][42][43] In addition, nanoparticles can be prepared in different ways, such as via hydrothermal decomposition. 35,36,38,61…”

“…This article is intentionally focused on the preparation, properties and applications of hematite particles with uniform shape and size in the micron-size range. This is not to take away from all the works that have been done over the years on hematite nanoparticles, especially in relation to particle synthesis, [32][33][34][35][36][37][38][39][40][41][42][43] but because hematite microparticles appear to be better suited for a lot of soft matter applications in which magnetic interactions and single particle visualization become essential. We furthermore pay special attention to the preparation methods to provide a guide, also to the non-chemist, to facilitate particle synthesis and therefore their applications.…”