XPS and magnetization studies of cobalt sodium silicate glasses

Structural modification and enhanced magnetic properties with two phonon modes in Ca–Co codoped BiFeO3 nanoparticles

“…In general, Co 2p 1/2 appears at 15.0 eV above Co 2p 3/2 for Co 3+ and 15.4 eV for Co 2+ . In both samples, Co 2p 1/2 peak is seen at 15.05 eV above Co 2p 3/2 , which confirms the 3+ oxidation state of Co [20][21]. Fig.…”

Chemical analysis of silica doped hydroxyapatite biomaterials consolidated by a spark plasma sintering method

“…The Si 2p spectrum has decomposed into 103.5 and 102.3 eV, with an area intensity ratio of about 2:1. As reported by Mekki et al [20], the binding energy of SiO 4À 4 in sodium silicate was centered at 102.0 ± 0.2 eV. According to peak of SiO 2 was centered at 103.9 eV [21], the first component in the current specimen was assigned to Si-O 2 and thus the higher oxidation peak was attributed to silicon atoms belonging to isolated SiO 4À 4 .…”

Pd-Co carbon-nitride electrocatalysts for polymer electrolyte fuel cells

“…This latter species is ascribed to a Co(II) complex where the metal ion is coordinated by ligands such as chlorides, and oxygen-or nitrogen-based electron donor functionalities of heterocyclic aromatic rings of the carbon-nitride matrix. The high-energy component was associated with a shake-up satellite line of Co(II) [38].…”

“…A careful inspection of XPS profiles in Co2p region indicates that: (a) no significant dependence of the oxidation state of cobalt on t f is revealed; (b) two components for Co2p located at about 781.3 and 786.3 eV are detected. The lower-energy component was ascribed to a Co(II) species [20,38]. This latter species is ascribed to a Co(II) complex where the metal ion is coordinated by ligands such as chlorides, and oxygen-or nitrogen-based electron donor functionalities of heterocyclic aromatic rings of the carbon-nitride matrix.…”