Conversion of platelets into dislocation loops and voidite formation in type IaB diamonds
Conversion of platelets into dislocation loops and voidite formation in type IaB diamonds
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IaB 型金刚石中片晶转化为位错环和空隙体形成
DOI：
10.1098/rspa.1995.0045
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
G. Woods
中科院分区：
文献类型：
--
作者：
T. Evans;I. Kiflawi;W. Luyten;G. van Tendeloo;G. Woods
la 型天然钻石在稳定压力下在 2400-2700°C 的温度范围内加热。研究的样品主要是常规 IaB 型钻石。对经过处理的样本进行的透射电子显微镜研究表明，血小板转化为间质 1/2a0<011> 位错环；也形成空洞体。当所有血小板都被转化时，与它们相关的实验特征也消失了，即。 e. X 射线额外反射（尖峰）、B' 局域模式吸收和单声子区域中的晶格吸收（称为 D 谱）。人们发现，当钻石在石墨稳定的条件下而不是在金刚石稳定的条件下加热时，转化率会大大提高；例如，在 2650°C 时，速率增加约三个数量级。这种增强被认为是由于金刚石结构本身的不稳定性，并提出了这种增强的原因。
Type la natural diamonds have been heated in the temperature range of 2400-2700°C under stabilizing pressures. The specimens studied are mainly regular type IaB diamonds. Transmission electron microscopy studies of treated specimens show that platelets are converted to interstitial ½a0<011> dislocation loops; voidites are also formed. When all the platelets have been converted, the experimental features associated with them also disappear, i. e. the X-ray extra reflections (spikes), the B' local-mode absorption and the lattice absorption in the one-phonon region termed the D spectrum. It is discovered that when diamonds are heated under graphite-stable rather than diamond-stable conditions, the rate of conversion is considerably enhanced; for instance, at 2650°C there is an increase in the rate of about three orders of magnitude. This enhancement is considered to be due to the instability of the diamond structure itself and a reason for this enhancement is suggested.