Taw qhia rau Semiconducting Ceramics

Semiconductor ceramics yog cov khoom siv ceramic uas nthuav tawm cov khoom siv hluav taws xob, nrog cov khoom siv hluav taws xob feem ntau yog li ntawm 10-6 txog 10-5 S/m. Vim tias lawv cov kev hloov pauv hloov pauv loj hauv cov lus teb rau cov xwm txheej sab nraud-xws li qhov kub thiab txias, lub teeb, hluav taws xob, thiab huab cua muaj pes tsawg leeg-cov ceramics tuaj yeem hloov pauv ntawm ib puag ncig lub cev kom muaj nuj nqis rau hauv hluav taws xob teeb liab, ua rau lawv tsim nyog rau kev tsim ntau hom kev hnov ​​​​lus.

 

Ib qho tshwj xeeb ntawm cov txheej txheem semiconductor ceramic yog qhov tsim nyog ntawm "semiconducting transformation" kauj ruam. Qhov kev hloov pauv no tuaj yeem ua tiav los ntawm doping nrog ions ntawm qhov sib txawv ntawm qhov sib txawv los hloov qee cov ions nyob rau hauv lub tswv yim siv lead ua theem (piv txwv li, BaTiO3InBa2+quiltLa3+); qhov no tsim cov lattice defects thiab cov ntaub ntawv pub los yog txais lub zog theem, ua rau n-hom lossis p-hom semiconductor ceramics. Lwm txoj hauv kev suav nrog kev tswj hwm qhov chaw tua hluav taws, sintering kub, thiab txheej txheem txias. Piv txwv li, qhov chaw oxidizing tuaj yeem ua rau cov pa oxygen ntau dhau, thaum qhov chaw txo qis tuaj yeem ua rau tsis muaj oxygen; Cov xwm txheej zoo li no ua rau cov khoom sib xyaw ua ke sib txawv ntawm stoichiometry, yog li inducing semiconducting cwj pwm. Semiconductor ceramic sensing cov ntaub ntawv muab cov txheej txheem tsim khoom yooj yim, tus nqi qis, compact loj, thiab ntau yam kev siv. Varistor ceramics yog cov ceramics uas tsis yog -linear voltage- kev sib raug zoo tam sim no- piv txwv suav nrog silicon carbide thiab zinc oxide-raws li ceramics. Lawv cov resistivity sib txawv nrog rau qhov siv voltage: qhov kev tiv thaiv yog siab heev hauv qab ib tug tej yam tseem ceeb voltage tab sis tee sharply thaum lub sij hawm pib dua. Zinc oxide varistor ceramics yog ib yam khoom lag luam hauv pawg no, siv feem ntau rau kev nqus dej, siab -voltage stabilization, voltage thiab tam sim no limiting, thiab overvoltage tiv thaiv.