Bismuth trioxide (Bi₂O₃) muaj nyob rau hauv plaub daim ntawv siv lead ua: , , , thiab δ. Daim ntawv yog qhov ruaj khov tshaj plaws nyob rau hauv chav tsev kub, nthuav tawm lub teeb daj monoclinic siv lead ua. Thaum qhov kub nce mus txog 729 degree, nws hloov mus rau hauv daim ntawv δ, uas muaj cov qauv cubic fluorite thiab nthuav tawm cov pa oxygen ion zoo heev.
Los ntawm cov qauv siv lead ua foundations, polycrystalline xwm ntawm bismuth trioxide txiav txim siab nws lub cev thiab electrochemical zog nyob rau hauv txawv kub tej yam kev mob:
-Bi₂O₃ (Low-Temperature Stable Phase)
Hom qauv: Monoclinic system, daim ntawv ruaj khov tshaj plaws ntawm chav tsev kub.
Cov yam ntxwv ntawm lub cev: tshwm sim daj daj mus rau xim av- daj hmoov los yog muaju, nrog rau qhov sib txheeb ze ntawm kwv yees li 8.9 thiab qhov chaw melting ntawm kwv yees li 825 degree.
Hluav taws xob conductivity: Oxygen ions muaj hluav taws xob conductivity tsawg, tab sis nws yog dav siv raws li ib tug yooj yim additive nyob rau hauv hluav taws xob ceramics.
-Bi₂O₃ (High-Temperature Metastable Phase)
Hom qauv: Tetragonal siv lead ua, feem ntau tsim nyob ib ncig ntawm 650 degree.
Cov tsos mob: Ci daj rau txiv kab ntxwv muaju, qhov sib txheeb ntom ntom 8.55, melting point kwv yees li 860℃.
Kev ruaj ntseg: Nyob twj ywm metastable thaum txias, tab sis nkag mus rau hauv theem dhau sijhawm ntev - khaws cia.
-Bi₂O₃ (High-Temperature Metastable Phase)
Hom qauv: Lub cev -centered cubic lattice, tsim ntawm kwv yees li 639℃.
Cov xwm txheej tshwm sim: tsim thaum lub caij txias ntawm theem δ; tsawg tsawg thiab kawm me ntsis.
δ-Bi₂O₃ (High-Temperature Stable Phase)
Hom qauv: Lub ntsej muag-centered cubic fluorite ntxhia qauv, ruaj khov saum 729 degree, melting ntawm 824 degree.
Cov yam ntxwv tseem ceeb: kwv yees li 1/4 ntawm qhov chaw oxygen ion nyob rau hauv cov siv lead ua lattice yog qhov tsis muaj, ua rau muaj cov pa oxygen ion conductivity siab heev (txog 1 S / cm), ua rau nws qhov kev tshawb fawb hotspot nyob rau hauv cov khoom - xeev electrolyte cov ntaub ntawv.
Daim ntaub ntawv: Haum rau cov khoom siv hluav taws xob xws li cov khoom siv roj oxide (SOFCs) thiab cov pa oxygen sensors.
