Los ntawm txoj kev xav ntawm cov qauv kev, cov khoom siv hluav taws xob ceramic feem ntau siv cov qauv siv lead ua, cov yam ntxwv ntawm cov ciam teb, thiab cov teebmeem hluav taws xob ntawm cov khoom siv hauv cov khoom siv ceramic kom ua tiav cov khoom hluav taws xob tshwj xeeb. Piv txwv li, los ntawm kev tswj cov purity thiab grain loj ntawm alumina ceramics, ceramic substrates yuav fabricated uas muaj tsawg high - zaus poob thiab ruaj khov dielectric qhov tsis tu ncua, ua rau lawv haum rau ntim ntawm high - ceev integrated circuits. Hloov pauv, los ntawm doping nrog cov ntsiab lus tsis tshua muaj hauv ntiaj teb-xws li lanthanum thiab strontium- cov khoom piezoelectric ntawm barium titanate ceramics tuaj yeem txhim kho tau zoo, tsim kom lawv ua cov ntaub ntawv tseem ceeb rau ultrasonic sensors thiab transducers.
Cov Khoom Hluav Taws Xob: Keeb kwm hauv Microscopic Defects thiab Polarization Behavior
Cov yam ntxwv hluav taws xob ntawm cov khoom siv hluav taws xob hauv hluav taws xob yog sib txuas nrog cov ntsiab lus tsis xws luag thiab kab tsis xws luag tam sim no hauv lawv cov qauv siv lead ua. Raws li kev cuam tshuam ntawm lub teb hluav taws xob, cov teeb meem no tuaj yeem tsim hluav taws xob dipoles thiab raug kho dua tshiab, yog li ua rau cov khoom xws li siab dielectric tsis tu ncua thiab qis dielectric poob.
Electronic Conduction Mechanism: Carrier Excitation
Cov tsoos ceramics feem ntau ua haujlwm ua cov insulators; Txawm li cas los xij, los ntawm cov txheej txheem ntawm doping-xws li ntxiv ntawm Bi₂O₃ rau ZnO-valence electrons tuaj yeem tau txais lub zog txaus los hloov mus rau hauv cov hluav taws xob dawb lossis qhov, yog li ua kom muaj hluav taws xob conduction. Cov txiaj ntsig conductive yog cuam tshuam los ntawm cov qauv ciam teb ntawm cov qoob loo thiab cov txheej txheem kev tsim khoom tshwj xeeb ua haujlwm.