Publications Repository - Gdańsk University of Technology

In this work, the influence of the substitution of niobium by titanium in Y3Nb1-xTixO7-δ on the structural and electrical properties is reported. Several experimental techniques, i.e. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-Ray Photoelectron Spectroscopy (XPS) and Electrochemical Impedance Spectroscopy (EIS), were applied to investigate the system Y3Nb1-xTixO7-δ. Titanium in Y3Nb1-xTixO7-δ is an acceptor-type dopant which charge is mainly compensated by oxygen vacancies, moreover, it may adopt different valence states, therefore, oxygen ion-, proton- and electronic-type conductivity are expected. Very interesting, non-monotonic changes in electrical and structural properties as a function of titanium content were observed. The competition between the increasing charge carrier concentration and structural phenomena such as short-range pyrochlore ordering and/or vacancy clustering was proposed as responsible for this non-monotonicity.

Authors

• dr inż. Piotr Winiarz link open in new tab ,
• dr hab. inż. Aleksandra Dorota Mielewczyk-Gryń link open in new tab ,
• dr inż. Sebastian Lech Wachowski link open in new tab ,
• prof. dr hab. inż. Piotr Jasiński link open in new tab ,
• dr hab. inż. Agnieszka Witkowska link open in new tab ,
• prof. dr hab. inż. Maria Gazda link open in new tab