abstract
The relationship between charge transport, defects and ferroelectric response is established for K0.5Na0.5NbO3 (KNN) and Mn-doped KNN ceramics. At room temperature the conduction in KNN is associated with hole transport and can be suppressed by Mn doping. Because of that a less leaky ferroelectric hysteresis loop is obtained for Mn-doped KNN. At high temperatures the conduction is dominated by the motion of ionized oxygen vacancies, the concentration of which increases with Mn doping. This work adds relevant information on KNN and leverages its potential application.
keywords
STRONTIUM-TITANATE CERAMICS; FREE PIEZOELECTRIC CERAMICS; DIELECTRIC-PROPERTIES; FERROELECTRIC CERAMICS; ELECTRICAL-PROPERTIES; PHASE-TRANSITIONS; MICROSCOPY; CRYSTAL; SYSTEM; STRAIN
subject category
Chemistry; Physics
authors
Rafiq, MA; Tkach, A; Costa, ME; Vilarinho, PM
our authors
Maria Elisabete Jorge Vieira Costa
Collaborator
Muhammad Asif Rafiq
PhD Student
Oleksandr Tkach
Assistant Researcher
Paula Maria Lousada Silveirinha Vilarinho
Vice Directoracknowledgements
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. Muhmmad Asif Rafiq and Alexander Tkach also acknowledge FCT for the financial support (SFRH/BD/66942/ 2009 and IF/00602/2013).