氧化钇稳定氧化锆
立方氧化锆
钇
材料科学
锆
单斜晶系
四方晶系
X射线光电子能谱
晶界
结晶学
陶瓷
矿物学
冶金
晶体结构
化学工程
微观结构
化学
氧化物
工程类
作者
Debasis Majumdar,Dilip Chatterjee
标识
DOI:10.1016/0040-6090(91)90449-8
摘要
Yttria-stabilized zirconia is an important structural ceramic with excellent mechanical properties. A stress-induced phase transformation from tetragonal to monoclinic crystal structure occurs in this material resulting in high strength with high fracture toughness and improved wear resistance. Surfaces and grain boundaries of yttria-stabilized zirconia were studied using X-ray photoelectron spectroscopy. Segregation of yttrium was observed at the surface as well as at the grain boundaries. The binding energies of zirconium and yttrium core levels in tetragonal yttria-stabilized zirconia were different from their values in standard zirconia and yttria respectively, indicating chemical shifts. Valence bands and Auger parameters were determined for the various phases of zirconia. Characteristic differences were observed for the monoclinic and the tetragonal phases owing to their different oxygen coordination. The results were used to monitor changes at the surface of yttria-stabilized zirconia subjected to various treatments.
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