The mineralized nanoparticles were nonstoichiometric magnetite with a unit formula of Fe2.85O4and coated by a thin layer of chitosan.
In general, nonstoichiometric magnetite can be expressed as Fe3-δO4, where δ is the vacancies number per unit formula.
XRD analysis and Raman spectra indicated that the mineralized nanoparticles were nonstoichiometric magnetite and the unit formula was Fe2.85O4.
4.4 Li per unit formula can be inserted into the LiNb3O8 material, corresponding to a composition of Li5.4Nb3O8.
Similar faradic processes, being almost 0.5 electron per unit formula reversible, had also been previously observed when using birnessite in alkaline electrolytes [37, 38, 39].
It is known that bulk metallic glasses are interpreted by simple composition formulas [cluster](glue atom 1 or 3, with the valence electron number per unit formula (e/u) being universally 24.
Its water adsorption isotherm at room temperature and pressure shows that the water content in it was 31 cm3 g−1 at the maximum allowable humidity, corresponding to 3.7 water molecules per unit formula.
Vanadium pentoxide (V2O5) is an attractive cathode material for lithium-ion batteries (LIBs) because of its low cost, high abundance, and relatively high theoretical capacity (294 mA h g−1 with two lithium insertions/extractions per unit formula at 2.0 4.0 V).
It is unveiled that BMG formulas satisfy three ubiquitous rules: cluster formula of the form [cluster](glue atom 1 or 3 with 24 valence electrons per unit formula, the center and the glue sites occupied by the same atomic species, and the BMG composition falling within the eutectic zone.
Quasicrystals from Al-Cu-Fe and Al-Pd-Mn systems [7, 8] were studied as well, including a single grain icosahedral quasicrystal of nominal composition Al72Pd20Mn8 (compositions are quoted either in number of atoms per unit formula, as given above for the ω-compound, or in at. % as is the case in this formula).
