Biganeh A, Kakuee O, Rafi-Kheiri H
Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran.
Physics and Accelerators Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran.
Appl Radiat Isot. 2020 Dec;166:109330. doi: 10.1016/j.apradiso.2020.109330. Epub 2020 Jul 27.
Four samples of nominally pure KCl crystals and doped with Zn impurities are grown by the Czochralski method and characterized by X-ray diffraction and Proton Induced X-ray Emission techniques. Positron Annihilation Lifetime Spectroscopy (PALS) is performed to obtain information on the cation vacancy type defects and their evolution under doping. The results of the PALS experiment indicate that doping KCl by Zn ions, at first increases the concentration of mono vacancies and in the second stage leads the creation of divacancy sites. Coincidence Doppler Broadening Spectroscopy (CDBS) is carried out to obtain the chemical environment of positron annihilation sites. The results of CDBS show that cation vacancies have a significant role in the annihilation process. An interesting observation is the participation of Zn cations in the positron annihilation process which confirms that positrons are not completely localized on the anion sites. The internal consistency between the results of PALS and CDBS experiments is also clarified.
通过提拉法生长了四个名义上纯净且掺杂了锌杂质的氯化钾晶体样本，并采用X射线衍射和质子激发X射线发射技术对其进行表征。进行正电子湮没寿命谱（PALS）以获取有关阳离子空位型缺陷及其在掺杂情况下演变的信息。PALS实验结果表明，用锌离子掺杂氯化钾，首先会增加单空位的浓度，在第二阶段会导致双空位位点的产生。进行符合多普勒展宽谱（CDBS）以获取正电子湮没位点的化学环境。CDBS结果表明阳离子空位在湮没过程中起重要作用。一个有趣的观察结果是锌阳离子参与了正电子湮没过程，这证实了正电子并非完全定域在阴离子位点上。PALS和CDBS实验结果之间的内在一致性也得到了阐明。
