The effect of high-pressure–high-temperature annealing on paramagnetic defects in diamond
The effect of high-pressure–high-temperature annealing on paramagnetic defects in diamond
复制标题
高压高温退火对金刚石顺磁缺陷的影响
DOI：
10.1088/0953-8984/15/39/017
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. Kanda
中科院分区：
文献类型：
--
作者：
R. Pereira;W. Gehlhoff;A. Neves;N. Sobolev;L. Rino;H. Kanda
通过对生长晶体的综合热处理研究，研究了高压高温金刚石中顺磁缺陷的形成和退火。金刚石晶体在 1550 至 2000°C 的温度范围内进行一系列等时退火，并且在每个退火步骤后通过电子顺磁共振测量来确定顺磁性缺陷的浓度。根据最近发表的关于退火时镍和/或氮缺陷行为的结果对定量数据进行了分析。与 P1 和 W8 中心一样，NIRIM1 镍相关缺陷在 1900°C 退火后浓度显着下降，而 NIRIM2 中心似乎相当稳定。退火过程中镍相关中心浓度的演变表明，并非所有 W8 缺陷都会转化为顺磁性镍氮复合物。事实上，大多数 W8 缺陷在其他非顺磁中心转变，AB1、AB3 和 AB6 缺陷可能是该过程的副产品。退火时形成的镍-氮顺磁配合物浓度相对较低，表明它们的形成在热处理过程中氮聚集的动力学中不发挥任何基本作用。
The formation and annealing out of paramagnetic defects in high-pressure and high-temperature diamond are investigated through a comprehensive heat treatment study of as-grown crystals. Diamond crystals are subjected to a sequence of isochronal anneals in the temperature range between 1550 and 2000 °C and the concentrations of paramagnetic defects are determined by electron paramagnetic resonance measurements after each annealing step. The quantitative data are analysed in the light of recently published results on the behaviour of nickel and/or nitrogen defects upon annealing. Like the P1 and W8 centres, the NIRIM1 nickel-related defects show a strong decrease in their concentration upon annealing at 1900 °C, whereas the NIRIM2 centres seem to be rather stable. The evolution of the nickel-related centre concentration through the annealing sequence shows that not all W8 defects transform into paramagnetic nickel–nitrogen complexes. Indeed, most of the W8 defects are transformed in other non-paramagnetic centres, with the AB1, AB3, and AB6 defects being probably by-products of this process. The relatively low concentration of nickel–nitrogen paramagnetic complexes formed upon annealing shows that their formation does not play any fundamental role in the kinetics of the nitrogen aggregation during heat treatments.