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Defect chemistry and hardening of ferroelectric cobalt-doped bismuth ferrite ceramics: doctoral thesis

Author(s): Maja Makarovič (Author), Tadej Rojac (Supervisor), Sverre Magnus Selbach (Co-Supervisor)

Year: 2020

Type: Doctoral dissertation

Bismuth ferrite, BiFeO3 (BFO), has been recognized as a promising lead-free material for high-temperature piezoelectric applications due to its high Curie temperature of 825 °C. However, the practical use of BFO has been limited in particular by its elevated electrical conductivity. In addition, BFO shows the characteristics of ferroelectric hardening, …

Sintering and phase transition behaviour of sodium niobate

Author(s): Jurij Koruza (Author), Barbara Malič (Supervisor), Tadej Rojac (Co-Supervisor)

Year: 2013

Type: Doctoral dissertation

Sodium niobate (NaNbO3) is the end member of several alkaline niobate-based solid solutions, which represent an important group of environment-friendly lead-free piezoceramics. Even though alkaline niobates are of considerable technological importance, problems in obtaining high densities and a fine-grained microstructure are still reported and not much is known about the …