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电子自旋共振(ESR)是研究晶体中点缺陷和化合物中离子价态的实验方法之一.ESR实验研究发现ZrO_2纳米晶中的点缺陷与材料制备的方法和工艺密切相关.通常情况下ZrO_2多晶和微晶是白色的,Zr~(4+)和O~(2-)都是非磁性离子,自旋量子数s均为零,因而没有ESR信号.但用柠檬酸盐爆炸分解方法制备的纳米晶(粒径为9.2nm)是深灰色的,并测到了色心的ESR信号,这是由于爆炸分解法制备的纳米晶是在极短促的瞬间生成的,晶粒中有许多色心点缺
Electron spin resonance (ESR) is one of the experimental methods to study the crystal defects and the valence states in the compounds.ESR experiments show that the point defects in the ZrO2 nanocrystals are closely related to the method and technology of the material preparation.Under normal conditions, ZrO2 The polycrystalline and microcrystalline white, Zr ~ (4 +) and O ~ (2-) are non-magnetic ions, the spin quantum number s are zero, so there is no ESR signal.But using citrate explosion decomposition method Of the nanocrystals (9.2 nm in particle size) are dark gray in color, and the ESR of the color center is measured. This is because the nanocrystals prepared by the explosive decomposition are generated at a very short moment, and there are many color centers Lack of points