Identification of electron and hole traps in lithium tetraborate (Li2B4O7) crystals: Oxygen vacancies and lithium vacancies
Identification of electron and hole traps in lithium tetraborate (Li2B4O7) crystals: Oxygen vacancies and lithium vacancies
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DOI：
10.1063/1.3392802
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发表时间：
2010-06
影响因子：
3.2
通讯作者：
M. Swinney;J. McClory;J. Petrosky;Sha Yang;A. Brant;V. Adamiv;Y. Burak;P. Dowben;L. Halliburton-L.-Ha
中科院分区：
文献类型：
--
作者：
M. Swinney;J. McClory;J. Petrosky;Sha Yang;A. Brant;V. Adamiv;Y. Burak;P. Dowben;L. Halliburton-L.-Ha
采用电子顺磁共振（EPR）和电子-核双共振（ENDOR）方法对四硼酸锂（Li2B4O7）晶体中氧空位俘获的电子和锂空位俘获的空穴进行了识别和表征。我们的研究包括一个晶体与天然丰度的B10和B11和晶体高度富集B10。生长的晶体含有孤立的氧空位，锂空位，和铜杂质，所有在非顺磁性电荷状态。在用60 kV X射线在77 K下照射期间，双电离氧空位捕获电子，而单电离锂空位和单价铜杂质捕获空穴。当样品的温度升高到约90 K时，空位恢复到它们照射前的电荷状态。超精细相互作用与B10和B11核，观察到13和40 K之间的辐射诱导EPR和ENDOR光谱，提供了两个空位相关的缺陷模型。被氧空位捕获的电子...
Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are used to identify and characterize electrons trapped by oxygen vacancies and holes trapped by lithium vacancies in lithium tetraborate (Li2B4O7) crystals. Our study includes a crystal with the natural abundances of B10 and B11 and a crystal highly enriched with B10. The as-grown crystals contain isolated oxygen vacancies, lithium vacancies, and copper impurities, all in nonparamagnetic charge states. During an irradiation at 77 K with 60 kV x-rays, doubly ionized oxygen vacancies trap electrons while singly ionized lithium vacancies and monovalent copper impurities trap holes. The vacancies return to their preirradiation charge states when the temperature of the sample is increased to approximately 90 K. Hyperfine interactions with B10 and B11 nuclei, observed between 13 and 40 K in the radiation-induced EPR and ENDOR spectra, provide models for the two vacancy-related defects. The electron trapped by an oxygen vacancy ...