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功能陶瓷講義ppt課件-展示頁

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【正文】 () The above the contributions of ionic and electronic polarization, which are sensibly independent of temperature, the resonance curves are also. })( 1{ 22002*gec jmNee?=?gee jmNer ??=? )(1122002*})({1 2222202200239。 Eddue to the dipoles within the boundary. Applied External Field, Internal Macroscopic Field amp。 as Space Charge or Diffusional Polarization 電位移 D、 電場強度 E與極化強度 P的關(guān)系 For case a): E=s/e0 () s surface charge density For case b): E=(sTsP)/e0 () sT – total surface charge density。 ai Ionic Polarization。 mj=average dipole moment) mj= aj E’ () aj polarizability of average dipole moment。 MMA2022 (Hangzhou, China) ? Member of Executive Board, Asian Electroceramics Association (AECA). ? Authored or coauthored more than 140 papers in pierreviewed international journals ? … Research Activities in . Chen’s Group ? 微波介質(zhì)陶瓷及其應(yīng)用 (Microwave dielectric ceramics and their applications) ? 中介電常數(shù)微波介質(zhì)陶瓷新體系 ? 低介電常數(shù)微波介質(zhì)陶瓷新體系 ? 疊層介質(zhì)諧振器 ? 可調(diào)諧介電薄膜 ? 鐵電與介電新材料 (Ferroelectric and dielectric new materials) ? 巨介電常數(shù)材料 (Giant dielectric constant materials) ? 非鉛鐵電與弛豫鐵電陶瓷 (Pbfree ferroelectric and relaxor ferroelectric ceramics) ? 微圖案鐵電薄膜 (Micropatterned ferroelectric thin films) ? 復相與多功能耦合陶瓷 (Composite and multifunctional ceramics) ? 磁電復相陶瓷 (Magetoelectric posite ceramics) ? 多鐵性材料 (Multiferroic materials) ? 磁性電介質(zhì) (Magic dielectrics) 功能陶瓷的基本概念 與結(jié)構(gòu)陶瓷相對應(yīng)的概念,主要指具備特定的電、磁、聲、光、熱等物理性能的陶瓷材料; 電子陶瓷是功能陶瓷的主體; 電子陶瓷: 介電陶瓷 (絕緣陶瓷 )、鐵電陶瓷、反鐵電陶瓷、壓電陶瓷、熱釋電陶瓷、半導體陶瓷、電光陶瓷、磁性陶瓷等 在電子、通訊、軍事、以及家電技術(shù)中有著廣泛的應(yīng)用。 Metallurgy, The University of Tokyo in 1991 ? Research Scientist at Yokohama Ramp。 Email: Web: Brief Introduction of . Chen ? Was born in Hunan 1959 ? . Dept. Mater. Sci.amp。Electronic Ceramics and Their Applications . Chen (陳湘明 ) Department of Materials Science amp。 Engineering, Zhejiang University, Hangzhou 310027 Tel: 87952112。 Eng., Central South University in 1981 ? PhD Dept. Mater. Sci. amp。D Labs., Furukawa Electric Co. Ltd. (Japan), 19911994 ? Associate Professor, Dept. Mater. Sci. Eng., Zhejiang Univ. 19941996 ? Professor, Dept. Mater. Sci. Eng., Zhejiang Univ., Since 1996 ? Distinguished Young Scientist Foundation of NSFC in 2022 ? Professor of ―Changjiang Scholar Program‖ 2022 ? Member of International Advisory Board of MMA2022, MMA2022, MMA2022 ? Chairman, MMA2022 (Inuyama, Japan) amp。 功能陶瓷的學科關(guān)系 學科基礎(chǔ): 固體物理、固體化學、電磁學、材料科學基礎(chǔ) 相關(guān)學科: 電子、通訊、儀器儀表等 無機非金屬材料 功能材料 功能陶瓷 功能陶瓷 — 現(xiàn)代電子技術(shù)的 三 大物質(zhì)基礎(chǔ)之一 半導體材料 電介質(zhì)材料 (功能陶瓷 ) 光電子材料 微電子學 固體電子學 光電子學 電子材料 Primary Contents Elements of Dielectrics (電介質(zhì) ) and Ceramic Insulators Ferroelectric(鐵電 ), Relaxor Ferroelectric(馳豫鐵電 ), Antiferroelectric (反鐵電 ) Ceramics and Ceramic Capacitors(電容器 ) Microwave Dielectric Ceramics(微波介質(zhì)陶瓷 ) Piezoelectric(壓電 ) and Optoelectric Ceramics Ceramic Sensors ZnO Varistors(變阻器 ) Conducting Ceramics Chapter 1 Elements of Dielectrics and Ceramic Insulators I. Elements of Dielectrics 物質(zhì)按導電性能的分類 載流子長程運動與位移 —傳導、宏觀電流 ? 導體: 金屬、部分非金屬 ? 半導體: 部分非金屬單質(zhì)與化合物 ? 絕緣體 (無載流子長程運動與位移):大部分非金屬單質(zhì)與化合物 載流子短程運動與位移 —極化 (Polarization) ? 電介質(zhì) (絕緣體 +半導體;通常為絕緣體) 電介質(zhì)的基本物理概念 極化 極化 正負電荷中心偏移 偶極矩 (dipole moment) p=Qdx () 極化強度 P P=dp/dV=Njmj () (Nj=number of dipoles of type j。 E’ local electric field P=sp (surface charge density) () 極化機理 at= as+ao+ai+ae () aeElectronic (Atomic) Polarization。 aoOrientation (Dipolar) Polarization。 sP – polarazation charge density Since P= sP and sT=D (electric displacement) e0 E=PD () D= e0 E+
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