IJS KOLOKVIJ, sreda, 10. 1. 20224, ob 13. uri, prof. dr. Andreja Benčan Golob

[Nataša Goševac]

Vabimo vas na 7. predavanje iz sklopa »Kolokviji na IJS« v akademskem letu 2023/24, ki bo v sredo, 10. januarja 2024, ob 13:00 v Veliki predavalnici Instituta »Jožef Stefan« na Jamovi cesti 39 v Ljubljani. Predavanje bo v angleščini. Na voljo bodo kava, pijača in prigrizki.

 

 

Svet strukturnih napak v perovskitnih feroelektrikih

 

prof. dr. Andreja Benčan Golob

Institut »Jožef Stefan«, Ljubljana, Slovenija

 

 

Uporaba in razvoj perovskitnih feroelektrikov v elektroniki zahteva celovito razumevanje njihove strukture vse do atomske ravni. Ključne komponente pri tem so strukturne napake, ki se raztezajo čez več dimenzij, vključno s točkovnimi napakami, dislokacijami, domenskimi stenami, mejami med zrni ter nanodomenami. Uporaba napredne vrstične presevne elektronske mikroskopije na atomski ravni z matričnim detektorjem 4D STEM omogoča analizo narave napak, opazovanje napetostnih polj, preučevanje porazdelitve gostote naboja ter raziskovanje dinamičnih odzivov pod vplivom zunanjih motenj. V predavanju bom predstavila različne strukturne študije feroelektrikov, kot so bizmutov ferit, kalijev natrijev niobat in barijev titanat. Pokazala bom, kako vrsta, količina in mobilnost strukturnih napak vplivajo na lokalne materialne lastnosti, s čimer omogočajo krojenje teh lastnosti.

 

O predavateljici: Andreja Benčan Golob je znanstvena svetnica na Institutu »Jožef Stefan« in profesorica na Mednarodni podiplomski šoli Jožefa Stefana v Ljubljani. Od leta 2022 je koordinatorica večjega nacionalnega projekta za razvoj mikroskopije s 4D STEM in njene uporabe v energetsko pomembnih materialih vse do kvantne ravni.

 

 

Napovednik predavanja in posnetke preteklih predavanj najdete na novi spletni strani »Kolokvijev na IJS«  <https://kolokviji.ijs.si/> https://kolokviji.ijs.si/, posnetke pa tudi posebej na  <https://video.arnes.si/?hashtag=Kolokviji_IJS> https://video.arnes.si/?hashtag=Kolokviji_IJS (zadnje tri sezone) in  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs (starejši).

 

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We invite you to the 7th lecture in the framework of »JSI Colloquia« in the academic year 2023/24, which will take place on Wednesday, January 10, 2024, at 1:00 PM in the main lecture hall of Jožef Stefan Institute, Jamova cesta 39 in Ljubljana. The lecture will be held in English. Coffee, drinks and snacks will be available.

 

 

World of structural defects in perovskite ferroelectrics

 

Prof. dr. Andreja Benčan Golob

Jožef Stefan Institute, Ljubljana, Slovenia

 

 

Unlocking the potential of perovskite ferroelectrics in electronics relies on a comprehensive understanding of their structure down to the atomic level. The critical components in this pursuit are structural imperfections that span multiple dimensions, including point defects, dislocations, domain walls, grain boundaries and nanodomains that interact with each other. Utilizing advanced atomic-scale scanning transmission electron microscopy with a 4D STEM pixelated detector allows us to analyze defect types, detect strain fields, observe charge density distribution, and study dynamic responses under external stimuli. In my talk, I will showcase various structural studies of ferroelectrics like bismuth ferrite, potassium sodium niobate and barium titanate. I will explore how the type, quantity and dynamics of structural defects impact local material properties, offering the potential to tailor these properties.

 

About the lecturer: Andreja Benčan Golob is a scientific councilor at the Jožef Stefan Institute and a professor at the Jožef Stefan International Postgraduate School in Ljubljana. From 2022, she is the coordinator of a larger national project for the development of microscopy with 4D STEM and its application in energy-relevant materials down to the quantum level.

 

 

The lecture trailer and recordings of past lectures can be found on the new website of »JSI colloquia«  <https://kolokviji.ijs.si/> https://kolokviji.ijs.si/, and recordings specifically at  <https://video.arnes.si/en/?hashtag=Kolokviji_IJS> https://video.arnes.si/en/?hashtag=Kolokviji_IJS (last three seasons) and  <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs (older).

 

 

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