摘要
按照叠加模型和微扰理论 ,建立了电子顺磁共振 (EPR)参量 (D ,g∥ ,g⊥)与Al2 O3∶Ni2 +晶体局域结构之间的定量关系 .利用EPR参量决定了Al2 O3∶Ni2 +晶体的局域结构 .通过考虑适当的晶格畸变 ,成功地解释了Al2 O3∶Ni2 +晶体基态很大的零场分裂和各向异性的 g因子 .获得了Ni2 +离子上方最近邻的三个O2 - 离子偏向〔1 1 1〕晶轴 0 .60 3°,而Ni2 +离子下方的三个O2 - 离子偏向〔1 1 1〕晶轴 0 .598°.
The quantitative relationship between the Electron Paramagnetic Resonance(EPR)parameters \$(D, g\-∥, g\-⊥)\$ and the local structure parameters of Ni\+\{2+\} in Al\-2O\-3∶Ni\+\{2+\} crystal is established according to the superposition model and perturbation theory. The local structure for Ni\+\{2+\} paramagnetic center in Al\-2O\-3∶Ni\+\{2+\} crystal has been determined from EPR parameters of Ni\+\{2+\} ions. The very large zero field splitting parameter D and anisotropic g factors \$(g\-∥, g\-⊥)\$ of Ni\+\{2+\} ions in Al\-2O\-3∶Ni\+\{2+\} crystals are explained by considering the suitable local lattice distortion. We obtain that the three O\+\{2-\} ions above Ni\+\{2+\} rotate 0.603° toward axis while the three O\+\{2-\} ions below Ni\+\{2+\} rotate 0.598°toward it.
出处
《波谱学杂志》
CAS
CSCD
北大核心
2001年第3期209-214,共6页
Chinese Journal of Magnetic Resonance
基金
theEducationCommitteenaturalsciencefundofshaanxiprovince(0 0JK1 1 1 )
