a.a malleable ductile silvery-white ferromagnetic metallic element occurring principally in haematite and magnetite. It is widely used for structural and engineering purposes. See alsosteel,cast iron,wrought iron,pig iron. Symbol: Fe; atomic no.: 26; atomic wt.: 55.847; valency: 2,3,4, or ...
Hagenmuller, PKomornicki, S. et al. Investigation of mixed valency ferrites La1-xCaxFeO3-y (0 < x < 0.50) with the perovskite structure, Mat. Res. Bull. 16, 967-973 (1981).Komornicki S, Fournes L, Grenier J C, Menil F, Pouchard M, Hagenmuller ...
Iron alloying of oxidic cobaltate catalysts results in catalytic activity for oxygen evolution on par with Ni-Fe oxides in base but at much higher alloying compositions. Zero-field 57Fe Mössbauer spectroscopy and X-ray absorption spectroscopy (XAS) ar
It consists of La3+ ions inserted in FeO6 octahedral units [7]. LaFeO3 perovskite oxides evince keen practical interest due to the presence of Fe2+/Fe3+mixed valances accompanied by oxygen non-stoichiometry. The mixed valency can play a prominent role in affecting the magnetic properties of ...
In the context of bulk transition metal systems, such as manganites, the Kondo description is befitting due to mixed valency of the transtion metals. In such a scenario, the system lowers the ground state energy via delocali- zation of the additional electron/hole. In the process, an ...
Detailed investigations of phase transitions and magnetic structure in Fe(III), Mn(II), Co(II) and Ni(II) 3,4,5-trihydroxybenzoate (gallate) dihydrates by ... The effect of cation valency on the complex structures of divalent and trivalent transition metal gallates has been examined using ...
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Magnetic properties and valence states of iron ions were characterized by 57Fe Moessbauer spectroscopy performed at RT, which were found to be greatly dependent on the chemical composition of the samples. Electrical conductivity was measured in the 20–800 °C temperature range and for some ...
In this letter, we demonstrate an experimental method based on Electron Magnetic Circular Dichroism (EMCD) that will allow researchers to simultaneously map magnetic transitions and valency in real-space over interfacial cross-sections with sub-nanometer spatial resolution. We apply this method to an ...
with Ba ions, and Y cations are located between the layers. Two types of pyramids FeO5and CuO5are dissimilar in charges and are also with two unrelated symmetry mixed-metal Fe(Cu)O2layers. Furthermore, some studies support the acentric character of this crystal structure. Thus, the valency...