Crystallization pathway of sol–gel derived zinc-doped mullite precursors (CROSBI ID 223980)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mandić, Vilko ; Tkalčec, Emilija ; Popović, Jasminka ; Kurajica, Stanislav ; Schmauch, Jörg
engleski
Crystallization pathway of sol–gel derived zinc-doped mullite precursors
Zinc doped mullite precursors were sol–gel prepared in order to study the Zn influence on crystallization pathways of the spinels first formed at about 920–970◦C. Precursors were calcined at 700◦C andthermally treated at 1000–1300◦C and thereafter characterized (DTA/TG, PXRD, Rietveld refinement). Thermal treatment of precursors at 1000◦C initiates segregation of ZnAl2O4 from first formed Zn-rich gamma-alumina metastable solid solution. Remaining spinel reacts with amorphous silica yielding mullite ; thereby further enriching gamma-alumina on Zn. Thermal treatment affects Zn-doped gamma-alumina yielding crystallite size 11±3 and 28±4 nm at 1000 and 1300◦C, respectively. Parameter of inversion for ZnAl2O4, delta, increased from 0.05 to 0.20 upon heatingfrom 1000 to 1300◦C. SEM EDS analysis show the bodies sintered at 1600◦C reveal zinc deficiency due to Zn volatile nature. Electron microscopy (TEM, SEM) of sintered compacts exhibited microstructure with lower porosityhaving both elongated and equiaxial grains.
γ-alumina ; Zn-doped γ-alumina metastable solidsolution ; Gahnite ; Mullite ; crystallisation
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Podaci o izdanju
36 (5)
2016.
1285-1292
objavljeno
0955-2219
1873-619X
10.1016/j.jeurceramsoc.2015.12.004
Povezanost rada
Kemija, Kemijsko inženjerstvo, Temeljne tehničke znanosti