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SUMMARY:IMX Seminar Series - Emergence of forbidden properties in complex 
 materials
DTSTART:20220404T131500
DTEND:20220404T141500
DTSTAMP:20260501T055546Z
UID:3562c25ff5e21d080d311839dedbe2591263c033dec5f2a502115857
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dragan Damjanovic\, EPFL\nIn materials with complex chem
 istry and even a small concentration of defects\, properties are often 
 different from those that are expected when considering material's crystal
  structure. In complex materials the structure may not be the same when l
 ooked at different spatial scales. The properties (electric\, magnetic\, m
 echanic\, and coupled susceptibilities) are dependent on boundary conditio
 ns\, sample history and time. Material constants in such systems are neve
 r constant. What we see in an experiment is just a snapshot of the sample'
 s behavior at a given time and the next observer may see something else. W
 hile such behavior may be frustrating during an investigation\, it is exci
 ting because it offers an opportunity to study manifestations and coupling
  of many mechanisms operating concurrently in the material. One result of 
 this complexity is emergence of properties that are forbidden by the mater
 ial's nominal\, average symmetry. I will present several examples of emer
 gence of forbidden electrical polarity and electro-opto-chemo-thermo-me
 chanical coupling in organometallic halide perovskites\, oxide perovskit
 es and in oxides with fluorite structure\, which are nominally centrosymm
 etric. It will be shown that emergent properties can be sometimes order(s
 ) of magnitude higher than those in standard materials. Origins and applic
 ation potential of such effects will be discussed.    \n\n \n\nPark\, D
 .-S. et al.  "Induced Giant Piezoelectricity in Centrosymmetric Oxides".
  Science 2022\, 375\, 653. doi: 10.1126/science.abm749\n\nBencan\, A.
 \;  et al. "Atomic Scale Symmetry and Polar Nanoclusters in the Paraelect
 ric Phase of Ferroelectric Materials.”\,  Nat Commun 2021\, 12 (1)\,
  3509\, . https://doi.org/10.1038/s41467-021-23600-3.\n\nBio: Dragan Dam
 janovic was a professor at the Institute of Materials\, Swiss Federal Inst
 itute of Technology in Lausanne (EPFL). He lead the Group for Ferroelectr
 ics and Functional Oxides and taught undergraduate and graduate courses on
  structure and electrical properties of materials. Damjanovic received h
 is BSc degree in Physics from the Faculty of Natural Sciences and Mathema
 tics at the University of Sarajevo and his PhD degree in Ceramics Scienc
 e and Engineering from The Pennsylvania State University.\nThe research 
 activities include fundamental and applied investigations of piezoelectric
 \, ferroelectric and dielectric properties of a broad class of materials. 
 In his research\, he covers a wide range of spatial (atomic to macroscopic
 ) and time (mHz to GHz) scales.The current focus is on effects of polar na
 noclusters on the properties of ferroelectrics and related materials\,emer
 gence of electro-chemo-thermo-opto-mechanical coupling in organometallic
  halide perovskites and effects of charge transport on the electrostricti
 ve and induced piezoelectric response in oxides with fluorite structure. H
 e is an IEEE Fellow and a Fellow of the American Ceramic Society. \n 
LOCATION:https://epfl.zoom.us/j/68532296336?pwd=UXBrN1RBWHVFQjVjSko2NDF3S3
 Awdz09
STATUS:CONFIRMED
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