Split photo-electron signals from the unique closed-shell cation lanthanum(III)

Porous lanthanum doped NiO microspheres for supercapacitor application

“…La 3d 3/2 is also split and overlapped with Ni 2p 3/2 region. Such splitting of the main peaks has been observed in trivalent lanthanum compounds such ashalides [22,23], oxides [23,24], and sulfides [25]. In addition, these satellite peaks are observed due to the transfer of an electron from O 2p to the empty 4f shell of La leading to the 3d 9 4f 1 final state.…”

Optimization of the combustion synthesis towards efficient LaMnO3+y catalysts in methane oxidation

“…The profiles clearly show that lanthanum manganites can desorb different oxygen species at a temperature ranging from 90 to almost 900 • C. A small desorption due to very mobile oxygen species is observed from 90 to 350 • C for all the samples. Increasing the temperature, three main areas of oxygen loss can be distinguished, with onset desorption temperature at about 400-430 • C, 520-580 • C and 700 • C. As thoroughly discussed in many other works [30][31][32][33][34][35][36][37][38][39][40][41], these regions are generally referred to as being from the so-called ␣-and ␤-oxygen. According to Royer et al [33] two subgroups of ␣-species were noted.…”

“…9). The first one referenced at 284.6 eV is ascribed to adventitious carbon and the two other ones are related to adsorbed carbonates (289.1-289.4 eV) [36] and lanthanum carbonates species (286.1-286.6 eV) [37]. [38].…”

Correlation between the electronic and atomic structure, transport properties, and oxygen vacancies on La0.7Ca0.3MnO3 thin films

“…The La 3d HAXPES spectra show the expected doublet corresponding to the spin-orbit splitting accompanied by satellites of comparable intensity. The intensity and separation of these satellites respect to the main peak, which are assigned to electron transfer process, [11][12][13] provide a fingerprint to identify the La (III) oxide compound. We have obtained an energy separation of 17.1 eV 6 0.1 eV between the 3d 3/2 and 3d 5/2 photoemission peaks and 4.2 eV 6 0.1 eV for the satellites, corresponding to the La 2 O 3 compound.…”

“…9 In the case of epitaxial thin films, the in plane lattice parameter a 1 and a 2 matches those of the substrate. As the LCMO in-plane lattice parameter is a 1 ffi a 2 ffi ͱ2a STO , the manganite grows with its crystallographic axis along the (11) and (1-1) direction of the STO substrate, i.e., both lattices are rotated by 45 , in order to minimize the lattice mismatch (1%) between both materials. The LCMO out-of-plane lattice parameter is a 3 2a STO .…”