Color Centers and the Flow Stress of LiF Single Crystals
Color Centers and the Flow Stress of LiF Single Crystals
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LiF 单晶的色心和流动应力
DOI：
10.1063/1.1702432
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发表时间：
1962
影响因子：
3.2
通讯作者：
J. Nadeau
中科院分区：
文献类型：
--
作者：
J. Nadeau
氟化锂晶体在300°和78°K下暴露于钴- 60伽马辐射中。为了将硬化与可识别的色心联系起来，测量了流动应力和光学吸收的变化。在300°K辐照的晶体中，发现流动应力与F中心浓度之间有很好的相关性。然而，硬化的程度表明它是由间隙缺陷引起的。通过对加色法和辐照法硬化缺陷的比较，发现硬化缺陷为间隙氟。这种间隙和F中心之间的直接关系支持了块状晶体中F中心产生的Varley型机制。在一些有限的实验中，NaCl和KCl定性地显示了相同的行为，并表明它们可能发生相同的F中心产生机制。78°K的LiF辐照产生了稳定的困孔中心，脉冲退火实验表明，vkc…
Lithium fluoride crystals were exposed to cobalt‐60 gamma radiation at 300° and 78°K. Changes of the flow stress and of the optical absorption were measured in an effort to relate the hardening to identifiable color centers.In crystals irradiated at 300°K there was found to be a good correlation between the flow stress and the concentration of F centers. The magnitude of the hardening, however, suggested that it was caused by interstitial defects. Comparison of the hardening produced by additive coloring with that produced by irradiation indicated that the hardening defects were interstitial fluorines. This direct relation between interstitials and F centers supports a Varley type of mechanism for F‐center production in the bulk crystal. Some limited experiments with NaCl and KCl showed qualitatively the same behavior and suggest that the same F‐center production mechanism may occur in them.Irradiation of LiF at 78°K produced stable trapped‐hole centers and pulse annealing experiments showed that the Vk c...