40th ECA Lunch webinar

The ECA kindly invites you to the 40th ECA Lunch webinar:

The search for ecologically friendly ferroelectric systems that have the potential to replace the exemplary PbZr_1-xTi_xO₃ as an industrial material, requires a deep understanding of the composition-induced changes in the structure on a multiscale level.
The lead-free (1-x)Na_0.5Bi_0.5TiO₃-xBaTiO₃ (NBT-xBT) solid solution (perovskite structure type) has been identified as an attractive “green” ferroelectric, but the effect of Ba on its nanoscale structure across the morphotropic phase boundary still remains an enigma, in spite of extensive research over the past decade. One way to elucidate the relationship between the chemistry, local polar distortions, and net polarization is to study the structural transformations under external stimuli (temperature, pressure or electric field) by complementary X-ray diffraction and Raman-spectroscopic analyses, as these methods probe the structure at different length and time scales. Pressure in particular is a powerful thermodynamic variable that can oppose to the internal chemical pressure generated by substitutent cations and thus reveal the local elastic strains associated with compositional variations.
In this lunch seminar, I will be first recalling some basic concepts of ferroelectric solid solutions and how to perform high pressure experiments using the diamond-anvil-cell technique, and then I will be presenting our recent results on the high-pressure behavior of NBT-xBT single crystals with compositions across the MPB [1-3].

[1] Rösche et al. Phys. Rev. B., 108, 094110 (2023)
[2] Rösche et al. Sci. Rep., 14, 18799 (2024)
[3] Rösche et al. Phys. Rev. B., 112, 184102 (2025)

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Intro + ~45min + ~15min Q&A
When: 15th January 2026 at 13:00 CEST (i.e. 1:00 p.m. in Paris/Berlin/Vienna…).
Where: Online :::::::link to registration:::::::

 

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For inquiries please send a message to eca-webinar_at_ecanews.org.

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About the ECA Lunch webinars:

The ECA lunch webinars with an educational or scientific focus were invented following the strong wish to strengthen and vitalize the European crystallographic community. They are a monthly webinar series by the European Crystallographic Association (ECA) and involve all GIGs/SIGs.

The webinars are organized in an online setting such as Zoom (45min + 15min Q&A) and take place every first or second (depending on the schedule of other ECA activities) Thursday of a month at lunchtime (1:00 PM CET). Webinars will be announced via social media, mailing list, and here.

The webinars are organized by a steering committee of GIG01-members:
Breternitz, Joachim
Gaidamaka, Anna
Germann, Luzia
Hans, Philipp
Mazzeo, Paolo P.
Morana, Marta
Pisacic, Mateja
Prencipe, Michele