OPOMNIK: IJS KOLOKVIJ, Torek, 27. 09. 2016; ob 13. uri; prof. dr. Paul Muralt

[Tanja Debevec]

Vabimo vas na 2. predavanje iz sklopa "Kolokviji na IJS" v letu 2016/17, ki bo v torek, 27. septembra 2016, ob 13. uri v Veliki predavalnici Instituta »Jožef Stefan«  na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu http://www.ijs.si/ijsw/Koledar_prireditev, posnetke preteklih predavanj pa na http://videolectures.net/kolokviji_ijs. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

prof. dr. Paul Muralt

Ecole Polytechnique Fédérale de Lausanne, Lozana, Švica

 

Izboljševanje učinkovitosti elektromehanskih tankih plasti

 

Ob nastopu četrte industrijske revolucije je pred nami pretežno robotizirani svet. Analogne elektromehanske naprave, ki so nujne za omenjeno revolucijo, omogočajo dodatne funkcije zaznavanja, aktuacije, komunikacije in izdelave. Piezoelektrični pojav ima pomembno vlogo pri kateri koli elektromehanski pretvorbi, zaradi česar ga izkoriščamo na primer pri ultrazvočnem slikanju in mobilni telefoniji. Zaradi vse večjega pomena miniaturizacije elektronskih naprav potrebujemo piezoelektrične tanke plasti z izboljšanimi lastnostmi. V predavanju bomo najprej predstavili osnove elektromehanske sklopitve: elektrostrikcijo, piezoelektričnost in njeno povezavo s feroelektričnostjo. Predstavili bomo najpomembnejše tankoplastne piezoelektrične materiale, izzive in dosežke na področjih rasti, integracije in lastnosti. Medtem ko tanke plasti svinec-cirkonijevega titanata izkazujejo veliko piezoelektrično napetost, zaradi česar so primerne za mikroaktuatorje, so tanke plasti aluminijevega nitrida odlične za uporabo v GHz območju zaradi visokega faktorja kvalitete. Nedavno so pokazali, da imajo zlitine s skandijevim nitridom precej večji piezoelektrični koeficient. Izmerjene lastnosti AlScN bomo primerjali z modeliranjem ab initio. Predavanje bomo zaključili z napovedjo preostalih izzivov in možnosti uporabe. 

Predavanje bo v angleščini.

Lepo vabljeni!

 

 

 




We invite you to the 2nd Institute colloquium in the academic year 2016/17. The colloquium will be held on Tuesday September 27, 2016 at 1 PM in the main Institute lecture hall, Jamova 39, Ljubljana. To read the abstract click  http://www.ijs.si/ijsw/Koledar_prireditev. Past colloquia are posted on  http://videolectures.net/kolokviji_ijs.

 

********************************************

prof. dr. Paul Muralt

Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

 

Pushing the performance of electro-mechanical thin films

 

We are witnessing the advent of the 4th industrial revolution, and are heading towards a largely robotized world. A lot of analogue electro-mechanical devices for sensing, actuation, communication, and fabrication are necessary ingredients for such revolution. Piezoelectricity plays an important role in any electro-mechanical conversion, and is used for instance in ultrasonic imaging and mobile phone communication. The necessary drive for miniaturization will result in a strong demand for piezoelectric thin films with improved, optimized properties. The talk will first introduce basic phenomena of electro-mechanical coupling: electrostriction, piezoelectricity, and its relation to ferroelectricity. The most important thin film piezoelectric materials are presented. Challenges and achievements in growth, integration, and properties will be reviewed. Results on performance issues such as achievable piezoelectric stress, aging and imprint will be discussed for lead-zirconate-titanate (PZT) thin films. While these are good for microactuators, aluminum nitride is superior at GHz frequency applications because of its higher mechanical quality factor. A recent discovery shows that alloying with scandium nitride leads to much larger piezoelectric coefficients. Most recent results on AlScN properties will be compared with ab initio calculations. The talk will finish with an outlook on remaining challenges, and potential applications. 

 

Cordially invited!

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.ijs.si/pipermail/kolokvij-ijs/attachments/20160926/2de8a066/attachment.html>