XPS examination of newly obtained (Na0.5Pb0.5)(Mn0.5Nb0.5)O3 ceramics

Simultaneous Yb3+-Induced Phase Transition and Sensitized Luminescence in Er3+-Doped KNN-Based Lead-Free Ceramics for Optical Thermometry

“…Three fitted component peaks for O 1s at binding energies of 531.6, 530.2, and 529.2 eV, represented lattice oxygen (O L ), deficient oxygen (O V ), and chemisorbed oxygen (O C ), respectively. , High resolution XPS spectra of Na 1s were not observed as a one-component singlet. The main Na 1s peak at ∼1072.3 eV was associated with the bulk sample, while the second peak at 1071.3 eV might have been connected with Na 2 CO 3 . These peaks all matched well with those of previous reports. , Moreover, based on fitting results from XPS Peakfit software, all fitted peaks moved slightly toward higher binding energy, which indicated that Yb 3+ occupied A sites in KNN .…”

Electric permittivity and conductivity of (Na0.5Pb0.5)(Mn0.5Nb0.5)O3 ceramics

“…The value of the activation energy of lower than 1 eV, and the density of current carriers, estimated herein for (Na 0.5 Pb 0.5 )(Mn 0.5 Nb 0.5 )O 3 , relates to highly oxygen-deficient sodium niobate (see Table 2) [44 -46]. The oxygen vacancies are highlighted as trapping centres for the charge carriers as the valence band of (Na 0.5 Pb 0.5 ) (Mn 0.5 Nb 0.5 )O 3 consists of O 2p states mainly, hybridised with Nb 4d states containing an admixture of Mn 3d and Pb 6p states [47]. Theoretical calculations [48,49] showed the existence of shallow levels of the order of some hundreds of an eV in case of neutral oxygen vacancies.…”

Dielectric relaxation property and barrier layer formation in CrNbO4 oxides

“…in the conductivity process is deduced [18]. Such a change in orientation of dipoles gives rise to a Debyetype peak in the dissipation factor D (Fig.…”