Effects of Synthetic Parameters in Pechini Method on the Formation and Properties of (ZrO_2)_(0.92)(Sc_2O_3)_(0.08) Solid Solution

作     者：张亚文 王晶晶 严铮光 严纯华 

作者机构：State Key Laboratory of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry Peking University Beijing 100871 China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2004年第22卷第4期

页      面：475-482页

核心收录：

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina ( 2 0 1710 0 3 2 0 2 2 110 1& 2 0 0 2 3 0 0 5 ) 

主　　题：materials chemistry scandia stabilized zirconia Pechini method rare earths 

摘      要：Homogeneous (ZrO_2)_(0.92)(Sc_2O_3)_(0.08) solid solution in fluorite cubic structure was prepared from the gels with altered molar ratios of citric acid (CA) to metal ions (M) and ethylene glycol (EG) via a polymerization route (Pechini method). Due to the enhanced chemical homogeneity (high level of mixing of metal ions and ligands) in the polymeric gels, Sc-doped zirconia can be crystallized at temperatures as low as 400 ℃. During the evolution from amorphous gel to the crystallized (ZrO_2)_(0.92)(Sc_2O_3)_(0.08) fine powder, the bonding nature between carboxylate groups and Zr/Sc cations changed: unidentate→bridging→ionic upon calcination. The molar ratios of CA/M (1～4) and CA/EG (0.2～4) were demonstrated to affect the thermal behavior of the gels and thus the particle properties of the derived nanoparticulate oxide powders (including particle size and surface area). The as-sintered sample compacted from the nanosized powders prepared by calcining the gel with the highest content of organics (CA/M=4 and CA/EG=0.2) exhibited the best sinterability and the highest oxide ion conductivity.