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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 9. predavanje iz sklopa "Kolokviji na IJS" v letu 2014/15, ki bo <b><span style='color:red'>v četrtek, 29. januarja 2015, 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'>prof. dr. Jacob L. Jones<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='mso-fareast-language:ZH-CN'>Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, ZDA<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><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:14.0pt'>Raziskave izvorov elektromehanične napetosti<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:14.0pt'>z in situ rentgenskim in nevtronskim sipanjem<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Dielektrične in piezoeletrične materiale uporabljamo za shranjevanje in pretvorbo električne in mehanične energije, zato so nepogrešljivi v vrsti naprav in aplikacij od senzorjev trka in premika, aktuatorjev, kondenzatorjev in mikroelektromehaničnih sistemov do šob za vbrizg dieselskega goriva, sonarjev in ultrazvočnih naprav. Zmogljivosti in meje delovanja teh naprav določajo dielektrične in piezoelektrične lastnosti materialov. A v večini primerov pravega odziva materiala ter s tem snovnih lastnosti ne poznamo dobro, saj je odvisen od vrste zapletenih mikrostrukturnih in kristalografskih prispevkov (npr. ionske in dipolarne polarizabilnosti, gibanja feroelastičnih domen in medfaznih mej ter lastnega piezoelektričnega pojava). V predavanju bomo predstavili naše napredne raziskave mehanike in fizike teh elektroaktivnih materialov z in situ rentgenskim in nevtronskim sipanjem, s katerimi smo določili prispevke različnih mehanizmov k snovnim koeficientom. V vseh primerih smo z mikromehanično teorijo te koeficiente kvantitativno povezali z neposrednimi meritvami prispevkov (piezoelektričnih) deformacij mreže in gibanja mej med zrni (npr. domenskih sten ali medfaznih mej).<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 the 9th Institute colloquium in the academic year 2014/15. The colloquium will be held <b>on Thursday, January 29, 2015 at 1 PM</b> in <b>the main Institute</b></span><b><span style='color:#1F497D'> </span><span style='color:black'>lecture hall</span></b><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>prof. dr. Jacob L. Jones<o:p></o:p></b></p><p class=MsoNormal><i>Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA</i><b><span style='font-size:16.0pt;mso-fareast-language:ZH-CN'><o:p></o:p></span></b></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><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 style='font-size:16.0pt'>Origins of Electromechanical Strain<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:16.0pt'>Ascertained from in situ X-ray and Neutron Diffraction<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal>Dielectric and piezoelectric materials are used to store and convert electrical and mechanical energy, making them essential to a broad range of applications and devices including impact and displacement sensors, actuators, capacitors, microelectromechanical systems, diesel fuel injectors, sonar, and ultrasound. In these applications, the dielectric and piezoelectric coefficients define the performance and the limits of device operation. However, the true origin of the material response, and thus the property coefficients, are not well understood because of the numerous and complex microstructural and crystallographic contributions to these properties (e.g., ionic and dipolar polarizability, ferroelastic domain wall motion, interphase boundary motion, the intrinsic piezoelectric effect, etc.). This talk will demonstrate our use of advanced in situ X-ray and neutron scattering methods to discern the underlying mechanics and physics at play in these electro-active materials, ultimately revealing the contribution of these various mechanisms to the property coefficients. In all cases, direct measurements of the contribution from lattice deformation (e.g., piezoelectric) and the motion of intragranular interfaces (e.g., domain walls, interphase boundaries) are quantitatively related to the property coefficients using micromechanics-based formulations.<o:p></o:p></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>