Zirconia, tseem hu ua zirconium dioxide (ZrO2), nthuav tawm cov khoom hluav taws xob tshwj xeeb uas txawv nyob ntawm nws cov qauv siv lead ua thiab dopants. Nyob rau hauv nws daim ntawv ntshiab, zirconia feem ntau suav hais tias yog ib qho insulator, txhais tau tias nws tsis ua hluav taws xob zoo. Qhov no yog vim hais tias cov qauv siv lead ua ntawm cov ntshiab zirconia ruaj khov nyob rau hauv daim ntawv cubic ntawm qhov kub thiab txias, thiab cov khoom tsis muaj hluav taws xob dawb lossis cov khoom siv hluav taws xob uas yuav tsum tau muaj rau hluav taws xob conductivity.
Oxygen ion conductivity
Txawm li cas los xij, zirconia tuaj yeem dhau mus rau theem kev hloov pauv ntawm qhov kub qis, feem ntau nyob ib puag ncig 1,170 degrees Celsius, ua rau cov qauv siv lead ua tetragonal. Qhov kev hloov pauv no ua rau muaj cov pa oxygen tsis txaus hauv lub lattice, tsim cov pa oxygen ion vacancies uas tuaj yeem ua raws li cov neeg nqa khoom. Cov pa oxygen ion conductivity no yog qhov tseem ceeb thiab ua rau ib feem stabilized zirconia (PSZ) ib tus paub zoo oxygen ion conductor. PSZ feem ntau yog siv los ua cov khoom siv electrolyte hauv cov khoom siv roj oxide (SOFCs) thiab oxygen sensors.
Electronic conductivity
Sib nrug los ntawm cov pa oxygen ion conductivity, zirconia tuaj yeem pom cov hluav taws xob conductivity thaum qee cov dopants tau nkag rau hauv nws cov qauv. Yttria-stabilized zirconia (YSZ), qhov twg yttrium oxide (Y2O3) ntxiv rau zirconia, yog ib qho piv txwv tseem ceeb. YSZ yog dav siv los ua electrolyte nyob rau hauv high-temperature roj hlwb, xws li khoom oxide roj hlwb. Qhov sib ntxiv ntawm yttrium stabilizes lub cubic theem ntawm chav tsev kub, tso cai rau siab ionic thiab hluav taws xob conductivity.
Hauv cov ntsiab lus, zirconia cov khoom hluav taws xob tuaj yeem hloov kho los ntawm kev qhia dopants lossis los ntawm kev ua nws rau cov xwm txheej tshwj xeeb, ua rau ntau qib ntawm hluav taws xob conductivity. Lub peev xwm los tswj nws cov conductivity ua rau zirconia ntau yam khoom siv nrog ntau yam khoom siv hluav taws xob thiab electrochemical.
