![]() ![]() Numerous studies suggest about the ability of iron oxide nanoparticles (Fe 30 4 and y-Fe 2 0 3) to remove heavy metals from contaminated water (Hua et al., 2012). Tumors can be killed by the local temperature increase that occurs when Fe 30 4 nanoparticles are placed in a rapidly varying magnetic field. Standard free energy of formation AGf (kJ/mol) Weakly ferromagnetic or antiferromagnetic Physical and magnetic properties of iron oxides. Therapeutic applications of superparamagnetic nanoparticle include targeted delivery of drugs (Duli'nska-Litewka et ah, 2019 Mahmoudi, Sant, Wang, Laurent, & Sen, 2011) and radioactive isotopes for chemotherapy and radiotherapy and contrast enhancement in magnetic resonance imaging. Fe圜L nanoparticles are used as a contrast agent in MR1 scanners. Iron oxides have a huge potential in biomedicine. 2017), and supercapacitor (Binitha et ah, 2013). It finds application in wide varieties of uses such as gas sensors (Wang, Yin, Zhang, Xiang, & Gao, 2010), water splitting (Bouhjar, Bessais, & Mari, 2018), anode material for lithium-ion batteries (Lin, Abel, Heller, & Buddie Mullins, 2011), photocatalyst (band gap 2.2 eV) (Mishra, & Chun, 2015), electron transport layer in solar cell (Guo et ah. This material exhibits weak ferromagnetism between 260 К and the Neel temperature. The d-d transitions and metal charge transfer play important roles in tuning the //-type semiconducting band gap of hematite. Thermodynamically, hematite (a-Fe 20 3) is the most stable in the family of iron oxides: 3, y-Fe 203. Some of their physical and magnetic properties are summarized in Table 6.1. Iron oxides have extensive and significant applications in semiconductor devices, magnetooptic memories, audio-video systems, computer chips, and in memory storage devices. (2019) also show that tuning the magnetic ordering in these materials controls the transport properties by modulating the band gap, which may be of use in spintronic or catalytic applications. It exhibits a striped ferrimag- netic ground state with a small net magnetic moment, whereas chromene has a ferromagnetic ground state. Two-dimensional hematene is found to be fully oxygen-passivated and stable under ambient conditions. The nature of magnetic ordering in non-van der Waals 2D metal oxides, hematene and chromene, was investigated (Bandyopadhyay, Frey, Jariwala, & Shenoy, 2019). Cr 20 3 is antiferromagnetic up to Трю-зоз = 307K and magnetoelectric. Hematite exhibits weak ferromagnetism between 260 К and 955 К and has not manifested the linear magnetoelectric effect. 203 = 307K, which shows that these materials have different magnetic properties. At the same time, their magnetic properties are determined by Neel temperature, Г^.р^оз = 955K r NCl. Bulk a-Cr 20 3 and a-Fe 20 3 both are hexagonal corundum structure with space group of R3c. Isostructural and isovalent iron and chromium oxides are the subject of active experimental and theoretical investigations last time. ![]()
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