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Core-shell formation in (Bi1/2Na1/2)TiO3-xSrTiO3 nanoparticles revealed by in situ TEM

Tuesday (27.09.2016)
11:20 - 11:21
Part of:
11:20 Lecture Core-shell formation in (Bi1/2Na1/2)TiO3-xSrTiO3 nanoparticles revealed by in situ TEM 0 Dr. Leopoldo Molina-Luna
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Session Postersession
Belongs to:

Ferroic materials play a key role in a wide range of technologically relevant devices. They all share the common feature that the microstructure and domains determine to a great extent their functionality. Among the promising piezoelectric materials for actuation applications is the solid solution Bi0.5Na0.5TiO3 (BNT)-SrTiO3 (ST). Recently it was found that this material is characterized by a core-shell microstructure that largely determines its electromechanical and dielectric properties [1]. In this contribution, we reveal the core-shell and domain formation in nanoparticles during a calcination process by means of in-situ TEM experiments. The solid state chemical reactions occurring upon heating could be followed in real time and the temperature-dependent core-shell formation and structural evolution was investigated. The experiments were carried out varying from 300 °C up to 800 °C using a dedicated in-situ TEM holder and a MEMS heating chip. Domain nucleation processes in the nanoparticles were observed. A domain-like structure was observed at T = 800 °C and atomic resolution was possible due to the high thermal stability and low-drift conditions. In situ TEM calcination temperature ramps were established according to previously obtained thermo-gravimetric analysis (TG/DTA) and ex-situ X-ray diffraction (XRD) results [2]. Ferroelectricity of core and shell was confirmed via PFM [3].

[1] M. Acosta, L.A. Schmitt, L. Molina-Luna, M.C. Scherrer, M. Brilz, K. G. Webber, M. Deluca, H.-J. Kleebe, J. Rödel, and W. Donner. Core-shell lead-free piezoelectric ceramics: current status and advanced characterization of the Bi0.5Na0.5TiO3-SrTiO3 system. Journal of the American Ceramic Society 98, pp. 3405-3422 (2015).

[2] J. Koruza, V Rojas, L Molina-Luna, U. Kunz, M. Duerrschnabel, H.-J. Kleebe, M. Acosta, Matias. Formation of the core–shell microstructure in lead-free Bi1/2Na1/2TiO3-SrTiO3 piezoceramics and its influence on the electromechanical properties. Journal of the European Ceramic Society (36) pp. 1009-1016 (2016).

[3] L. Molina-Luna, M. Acosta, X. Qian Xu, N. Liu, C. Dietz, R.W. Stark, H.-J. Kleebe. Core-shell formation in (Bi1/2Na1/2)TiO3-xSrTiO3 nanoparticles revealed by in situ TEM. ACS Nano. To be submitted.


Dr. Leopoldo Molina-Luna
Darmstadt University of Technology
Additional Authors:
  • Dr. Matias Acosta
    Darmstadt University of Technology
  • Dr. Qian Xu
  • Na Liu
    Darmstadt University of Technology
  • Dr. Christian Dietz
    Darmstadt University of Technology
  • Prof. Dr. Robert Stark
    TU Darmstadt
  • Prof. Dr. Hans-Joachim Kleebe
    Darmstadt University of Technology