세미나안내

[2015 09 16] 정기세미나 2nd

A New Material Design with Electride based on Interstitial Electrons:From Solvated Electrons to Electride as a new Electro-active Functional Materials

MSE Graduate Students and Researchers

관리자 | 2015.09.14 16:37 | 조회 1902


Reception: MSE Graduate Students and Researchers

Reference: MSE Professors

Subject: The 2nd Seminar - Fall Semester, 2015

 

 Date: 2015. 09. 16(Wed), 17:00 ~ 18:15

 Place: Science Building, Room.202 Multimedia Room

 Title: A New Material Design with Electride based on Interstitial Electrons:

From Solvated Electrons to Electride as a new Electro-active Functional Materials

 Speaker: Prof. SungWng Kim (Sungkyunkwan Univ.)

Host of a Seminar: Prof. Moon-Ho Jo

Speaker Language: ENGLISH

 

Abstract:

Solvated electrons in alkali metal-ammonia solution have been a diverse stem for scientific and applied researches. The alkali metal-ammonia solution containing solvated electrons can be condensed into ionic solid, known as electrides. Electride, which is regarded as a new electronic material, is ionic crystal in which interstitial electrons serve as anions. The physical properties of electrides are determined by the topology of cavities or channels which confine anionic electrons. The confining sites have been restricted to cavities or weakly linked channels of organic systems.  

In this talk, several inorganic electrides with different confining structures will be introduced as a new electro-active functional material in physics, electronics, chemistry and thermoelectrics. First, the subnanometer-sized cage network structure electride, [Ca24Al28O64]4+(4e-) have showed a variety of electrical properties such as insulator-semiconductor, metal-insulator and metal-superconductor transition. This subnanometer-sized cage network structure shows a low workfunction of 2.4eV. Second, the layered structured electride, calcium nitride was synthesized and highlighted with transport properties exhibiting the two dimensionally (2D) confined electron gas. A 2D transport characteristic of the bulky material is evidenced by a high electron mobility exceeding 1000 cm2×V-1s-1. Third, we recently discovered a new electride system in carbides with layered structure. Surprisingly, their physical properties exhibited a ferromagneticity according to the degree of localization of interstitial electrons. The recent experimental and theoretical studies on ferromagnetic electrides will be discussed.

 

 

Department of Materials Science and Engineering


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