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[2017 03 09] 특별세미나 Ph.D Rishi Raj

Flash Sintering: A New Paradigm in Physics of Ceramic Materials

POSTECH Graduate Students and Researchers

관리자 | 2017.03.07 15:32 | 조회 1806


Reception: POSTECH Graduate Students and Researchers

Reference: POSTECH Professors

Subject: MSE Special Seminar_Prof. Rishi Raj

 

Date: 2017. 03. 09(Thu) 17:00 ~ 18:15

Place: Science Building, Room.202 Multimedia Room

Title: Flash Sintering: A New Paradigm in Physics of Ceramic Materials

Speaker: Prof. Rishi Raj (University of Colorado Boulder)

Host of a Seminar: Prof. Junwoo Son

Abstract:

The phenomenon of flash sintering was discovered in 2010. It was shown that massive diffusion leads to sintering of ceramics at temperatures well below 1000 oC in less than five seconds, under the influence of modest electrical fields. That early discovery is now evolving into the possibility of creating new states of matter. For example, a transition to semiconductor like behavior in ceramics which, intrinsically, have very wide band gaps. There is bright electroluminescence the intensity of which is higher in one ceramic (e.g. HfO2) than in another (TiO2). Metastable phases have been shown to form. Most recent experiments show unususal electron and ionic transport properties being introduced into ceramics which are normally insulators. Conceptually these effects are attributed to the generation of colossal concentrations of defects. Experiments at the Synchrotrons (including PLS-II, APS, and NSLS-II)) and at Oak Ridge National Laboratory (Neutron Scattering) are underway for in-situ experiments to explore the generation of such defect avalanches.

 

Department of Materials Science and Engineering





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