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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 11. predavanje iz sklopa "Kolokviji na IJS" v letu 2016/17, ki bo <b><span style='color:red'>v četrtek, 12. januarja 2017, ob 13. uri </span></b><span style='color:red'>v Veliki predavalnici Instituta »Jožef Stefan«</span> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b><span style='mso-fareast-language:ZH-CN'>dr. Tadej Rojac in dr. Goran Dražić<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US style='mso-fareast-language:ZH-CN'>Institut Jožef Stefan in Kemijski institut<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:16.0pt'>Električna prevodnost domenskih sten bizmutovega ferita<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:16.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Bizmutov ferit (BiFeO<sub>3</sub>) se intenzivno raziskuje predvsem zaradi možnosti uporabe v visokotemperaturnih piezoelektričnih napravah, vendar pa je njegova uporaba omejena, saj izkazuje visoko električno prevodnost. Pomemben del te prevodnosti izhaja iz lokalne prevodnosti na domenskih stenah. Predstavili bomo rezultate, ki dokazujejo prisotnost točkastih defektov na stenah. Z raziskavo, pri kateri smo uporabili najmodernejši presevni elektronski mikroskop, smo razložili mehanizem p-tipa električne prevodnosti domenskih sten v BiFeO<sub>3</sub> in prispevali manjkajoči člen pri razlagi prevodnosti domenskih sten v feroelektrikih. Z istočasnim razvojem dveh analitskih mikroskopskih metod smo ugotovili, da so ti točkasti naboji dveh vrst in sicer elektronske luknje, povezane s prisotnostjo železovih ionov v 4+ oksidacijskem stanju, in vrzeli na bizmutovih mestih v kristalni rešetki. Nadalje smo pokazali, da je lokalno prevodnost domenskih sten moč prilagajati s spreminjanjem atmosfere med visokotemperaturno pripravo materiala. Raziskava bo omogočila nadaljnji razvoj materialov s kontroliranimi lokalnimi prevodnimi lastnostmi za uporabo v senzorjih, aktuatorjih, ultrazvočnih pretvornikih in tudi v nano-elektroniki prihodnosti.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-family:"Calibri",sans-serif;color:red'>Lepo vabljeni!</span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><span style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:SL'><br clear=all style='page-break-before:always'></span><p class=MsoNormal><span style='color:black'>We invite you to the11th Institute colloquium in the academic year 2016/17. The colloquium will be held </span><b><span style='color:red'>on Thursday, January 12, 2017 at 1 PM</span></b><span style='color:red'> in <b>the main Institute lecture hall</b></span><span style='color:black'>, Jamova 39, Ljubljana. To read the abstract click </span><span style='color:#1F497D'><a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>. </span><span style='color:black'>Past colloquia are posted on</span><span style='color:#1F497D'> <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><o:p></o:p></b></p><p class=MsoNormal><b>dr. Tadej Rojac in dr. Goran Dražić<o:p></o:p></b></p><p class=MsoNormal><i><span lang=EN-US>Jožef Stefan Institute and National Institute of Chemistry<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:ZH-CN'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-GB style='font-size:16.0pt'>Domain wall conduction in bismuth ferrite<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-GB style='font-size:16.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB>Ferroelectric bismuth ferrite has been extensively studied as a candidate material for high-temperature piezoelectric devices. One of the drawbacks of this material is its high electrical conductivity which mostly stems from the local conduction at the domain walls. Mobile charged defects, accumulated at the domain walls to screen polarization charges, have been proposed in several ferroelectrics as the origin of this local conduction, however, the presence of defects has not yet been directly confirmed. Using state-of-the-art aberration corrected electron microscopy, we explained the p-type conduction mechanism at the domain walls of bismuth ferrite and thus contributed the missing piece for explaining domain-wall conduction in ferroelectrics. We elaborated two analytical methods allowing chemical analysis at the atomic scale, which lead to identification of iron (IV) ions and bismuth vacancies accumulated at the domain walls. Iron (IV) ions in bismuth ferrite are associated with electron holes, thus leading to p-type hopping conduction at the domain walls. We further showed that the local domain-wall conductivity can be tailored by controlling the atmosphere during high-temperature annealing. The results open up possibilities for engineering local conductivity in ferroelectrics thus advancing the development of ferroelectric materials for sensors, actuators, ultrasound transducers and even nanoelectronics</span><span lang=EN-US>.</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cordially invited!<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div></body></html>