Defect and electrical transport properties of Nb-doped SrTiO3

Microstructural and electrical properties of Y0.07Sr0.93-x TiO3-δ perovskite ceramics

“…Although no evidence of SrO was found in this sample, we suggest that a trace amount of this phase can be formed according to Eq. (5), as it was reported by Blennow et al [11]. It can not be identified with XRD technique because of its limited sensitivity, but it may influence the grain growth kinetics and thus it can explain our SEM observations.…”

“…A significant increase of total conductivity compared to conductivity of non-reduced samples was noticed. According to Blennow et al [11] oxygen has a tendency to leave lattice at low oxygen partial pressure [p(O 2 ) ≈ 10…”

“…Additionally, Blennow et al [11] suggest that charge compensation of donor dopants is done mainly by formation of strontium vacancies. In the case of Y-doped SrTiO 3 , in high oxygen partial pressure, it can be described by reaction (5):…”

Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3−δ SOFC anodes

“…3a) compared to the conductivity of samples synthesized in air was also noticed. According to Blennow et al [6] oxygen has a tendency to leave the lattice at a low oxygen partial pressure. Thus, the concentration of oxygen vacancies significantly increases.…”

“…It has been previously shown [6,7] that in Nb and Y co-doped SrTiO 3 the electrical conductivity level of the material is strongly influenced by both the dopant concentration and by thermodynamic conditions, such as temperature, surrounding atmosphere, etc. To facilitate the understanding of this correlation, a brief summary of the defect chemistry of Nb and Y co-doped SrTiO 3 will now be given.…”