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Lecture

Barium titanate – Influence of A- and B-site doping on crystallography and dielectric properties

Wednesday (07.06.2017)
17:10 - 17:30 Förde III
Part of:


Despite its toxic properties lead zirconate titanate (PZT) is currently the first choice for ferroelectric applications. Due to its exceptional properties it is used for a variety of purposes. Barium titanate and compounds based on barium titanate are promising candidates which show similar properties and at the same time have the advantage of being non-toxic, for example Liu et al. reported on the system Ba(Ti0.8Zr0.2)O3-(Ba0.7Ca0.3)TiO3 which showed comparable piezoelectric properties like PZT [1].


In this work barium titanate is doped isovalently and the influence of the doping on phase transition temperatures is investigated as well as the temperature dependent influence on dielectric and crystallographic properties. The resulting crystal structures are investigated in regard to the theory of elastic compatibility [2] as an ideal compatibility of the transforming phases lowers hysteresis effects.


Funding by the DFG and the RDF Fund of the Institute on the Environment at the University of Minnesota is gratefully acknowledged.


[1] W. Liu, X. Ren, Phys. Rev. Letters, 103, 257602, 2009

[2] Chen, X., Srivastava, V., Dabade, V. & James, R. D. Study of the cofactor conditions: conditions of supercompatibility between phases. J. Mech. Phys. Solids (2013)


 

Speaker:
Maike Wegner
Kiel University (CAU)
Additional Authors:
  • Dr. André Piorra
    Christian-Albrechts-University of Kiel
  • Prof. Dr. Richard D. James
    University of Minnesota
  • Prof. Dr. Eckhard Quandt
    Christian-Albrechts-University of Kiel