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Properties of t‐zirconia prepared by a composite‐assisted nonhydrolytic sol‐gel
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2018-07-11 , DOI: 10.1111/jace.15904
Christine Warwar Damouny 1 , Christine Khoury 1 , Oz M. Gazit 1
Affiliation  

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°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.

中文翻译:

复合辅助非水解溶胶凝胶制备的t-氧化锆的性质

使用非水解溶胶-凝胶法制备了高表面积高结晶四方Ni-Si掺杂ZrO 2样品。合成过程涉及在含Ni和Si的壳聚糖基复合材料(Ni @ Si-CS)的存在下,氯化锆和异丙醚的缩合反应,然后进行煅烧以去除CS。研究了锆前驱体与Ni @ Si-CS复合材料之间的相互作用,并将其与对形态,晶体结构,相组成和表面积的影响相关。针对不同的Ni @ Si-CS与ZrO 2的质量比评估了这些参数。发现增加Ni @ Si-CS复合材料的浓度会导致较小的ZrO 2晶粒纳米晶体和具有较高表面积的整体材料。在800°C下煅烧后,四方相/立方相的稳定性与ZrO 2的亚晶格中少量Ni 2+的存在和作为空间稳定剂的壳聚糖的存在有关。
更新日期:2018-07-11
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