Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 3: Focus: Ferroics with Mesoscopic Order
DF 3.1: Topical Talk
Montag, 20. März 2017, 09:30–10:00, WIL B321
Controlling core-shell formation in BNT-ST — •Till Frömling1, Azatuhi Ayrikyan2, Matias Acosta1, Leopoldo Molina-Luna1, Michael Dürrschnabel1, Hans-Joachim Kleebe1, Herbert Hutter3, and Kyle Webber2 — 1Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, Darmstadt, Germany, 64287 — 2Institute of Materials Science and Engineering, Friedrich-Alexander-Universität, Martensstraße 5, Erlangen, Germany, 91054 — 3Institute of Chemical Technologies and Analytics, Technische Universität Wien, Getreidemarkt 9, Vienna, Austria, 1060
Apart from synthesizing solid solutions and doping of ferroelectric materials tailoring core-shell microstructures is an excellent opportunity for modifying ferroelectric and dielectric properties. Recently, the core-shell development in Bi1/2Na1/2TiO3-SrTiO3 (BNT-ST) and its extraordinary impact on achievable strain has been evaluated. About 3% strain at 4 kV/mm was reached which exceeds values obtained for commercially available soft Pb(Zr,Ti)O3 (PZT). It is of major importance to gain more knowledge about possible ways to control the core-shell microstructure to actually be able to tailor the physical properties. Hence, the mechanism of core-shell formation in BNT-ST will be discussed in this work. With the help of secondary ion mass spectrometry (SIMS) and energy dispersive X-ray spectroscopy (EDX) interdiffusion experiments of BNT and ST diffusion couples are investigated. As a result, the species dominating the mass transport during sintering are qualitatively and quantitatively evaluated.