期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 102, 期 1, 页码 456-464出版社
WILEY
DOI: 10.1111/jace.15904
关键词
composites; crystals/crystallization; sol-gel; zirconia
资金
- Israel Science Foundation [152/11]
High surface area and highly crystalline tetragonal Ni-Si-doped ZrO2 samples were prepared using a nonhydrolytic sol-gel method. The synthesis involved the condensation of zirconium chloride and isopropyl ether in the presence of a chitosan-based composites containing Ni and Si (Ni@Si-CS), followed by calcination to remove the CS. The interactions between the zirconium precursor and the Ni@Si-CS composites were studied and correlated with the effect on morphologies, crystalline structure, phase compositions, and surface area. These parameters were evaluated for different Ni@Si-CS to ZrO2 mass ratios. It was found that increasing the concentration of Ni@Si-CS composite led to smaller grains of ZrO2 nanocrystals and an overall material with a higher surface area. The stability of the tetragonal/cubic phases following calcination at 800 degrees C was correlated with the presence of low amounts of Ni2+ in the sublattice of ZrO2 and the presence of the Si-chitosan, which acted as steric stabilizer.
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