波谱学杂志 ›› 1996, Vol. 13 ›› Issue (3): 267-275.

• 研究论文 • 上一篇    下一篇

金刚石材料的ESR研究

周建威1, 杨保联1, 胡红兵1, 李丽云1, 裘鉴卿1, 曾凡明1, 郭丸皋1, 詹如娟1, 陈丰1, 叶朝辉1, 贺萍2, 陆君涛2   

  1. 1. 中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室, 武汉 430071;
    2. 武汉大学化学系, 武汉 430072
  • 收稿日期:1995-06-14 出版日期:1996-06-05 发布日期:2018-01-17
  • 基金资助:
    第三世界科学院科学基金93-023 RG/CHE/AS项目和国家自然科学基金资助项目

ESR STUDY OF THE NATURAL DIAMONDS AND THE DIAMOND-LIKE MATERIALS

Zhou Jianwei1, Yang Baolian1, Hu Hongbing1, Li Liyun1, Qiu Jiangqing1, Zeng Fanming1, Guo Jiugao1, Zhan Rujuan1, Chen Feng1, Ye Chaohui1   

  1. 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhau Iastitute of Physics, The Chinese Academy Sciences, Wuhan 430071;
    2. Department of Chemistry, Wuhan University, Wuhan 430070
  • Received:1995-06-14 Online:1996-06-05 Published:2018-01-17

摘要: 用ESR方法对照研究了中国出产的五颗天然金刚石单晶,四颗人造金刚石单晶和两个化学沉积金刚石膜(CVD)等固体材料.发现Ib型天然金刚石中有四种aN各向异性的N-中心自由基和一种C-中心自由基;而IaB3型的未配对电子定域在N3型杂质中心的π*反键轨道上;Ib型人造金刚石含有少量Ni,Fe等顺磁元素造成ESR线增宽,仅可观察到二重或三重裂分;在不同金刚石膜中.c-中心自由基的浓度可以相差很大.而低浓度的N-中心自由基的浓度相对变化较小;所观察到的C-中心自由基的两个卫星峰(aH=7.2×10-4T)是金刚石膜中1H存在的直接证据.结果表明ESR方法是金刚石及类金刚石材料的一种快捷而有效的表征方法.

关键词: 金刚石, 金刚石类材料, ESR

Abstract: Five single crystals of the natural diamonds,four Synthetic diamonds and two diamond-like films (PCVD film) have been investigated by means of ESR method. The results show that there are four kinds of N-center free radicals and one kind of C-center free radical in the Ib type natural diamonds, and the unpaired electron is located on an antibonding orbital of the N3 impurity center in the IaB3 type natural diamonds.The ESR spectra of the Ib type synthetic diamonds are similar to the natural diamonds,except that the linewidthes are broader since they contain some paramagnetic elements,such as Ni,Fe,etc.For diamond films,the concentration of the C-center free radicals varies greatly. however,the concentration of the N-center free radicals,which are usually quite low in diamond-like films, varies relative slightly.Finally,the two satellite peaks of the C-center free radicals are found to be the direct evidence of the existence of hydrogen atoms in the PCVD films.

Key words: Diamond, Diamond-like material, ESR