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The influence of pressure on high-pressure, high - temperature annealing of type Ia diamond

机译:压力对Ia型金刚石高温高压退火的影响。

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摘要

The influence of temperature and pressure conditions during high-pressure, high-temperature (HPHT) annealing on the dissociation of nitrogen aggregates is investigated, and special attention is paid to the influence of pressure. When PT conditions are above the diamond-graphite equilibrium line, an activation energy of 5.6 +- 1.4 eV is calculated from the Arrhenius plot of the dissociation rate of A centres by assuming that the dissociation reaction of A centres follows first order kinetics. A second estimate for the binding energy of the A centres, derived from the equilibrium concentrations of A centres and C centres at three different temperatures, gives a value of 7.66 +- 0.6 eV. The dissociation rate of A centres is enhanced by a factor of approx 10 when the PT point during the HPHT annealing is located in the graphite stable region of the carbon phase diagram.
机译:研究了高压高温(HPHT)退火过程中温度和压力条件对氮聚集体解离的影响,并特别注意压力的影响。当PT条件高于金刚石-石墨平衡线时,通过假设A中心的解离反应遵循一级动力学,可以从A中心的解离速率的Arrhenius图计算出5.6 +-1.4 eV的活化能。从三个不同温度下的A中心和C中心的平衡浓度得出的A中心结合能的第二个估计值为7.66±0.6 eV。当HPHT退火过程中的PT点位于碳相图的石墨稳定区域时,A中心的解离速率提高了约10倍。

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