石英E'_1心电子自旋共振信号强度的热活化研究  

Study on the thermal activation of electron spin resonance(ESR) signal intensity in quartz E'_1 center

作　　者：李淼 易朝路[1,3] 毕伟力[1] 杨海军[4] 邱登峰[5] LI Miao;YI Chaolu;BI Weili;YANG Haijun;QIU Dengfeng(Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China;Department of Chemistry,Tsinghua University,Beijing 100084,China;State Key Laboratory for Oil and Gas Enrichment Mechanism and Effective Development of Shale,Laboratory of Structural and Sedimentary Reservoirs of the Sinopec Petroleum Exploration and Development Institute,Beijing 100083,China)

机构地区：[1]中国科学院青藏高原研究所,青藏高原环境变化与地表过程重点实验室,北京100101 [2]中国科学院大学,北京100049 [3]中国科学院青藏高原地球科学卓越创新中心,北京100101 [4]清华大学化学系,北京100084 [5]页岩油气富集机理与有效开发国家重点实验室,中国石油化工股份有限公司,石油勘探开发研究院,构造与沉积储层实验室,北京100083

出　　处：《地球环境学报》2018年第6期614-621,共8页Journal of Earth Environment

基　　金：国家自然科学基金项目(41230523);中国科学院战略性先导科技专项(XDA20070102)~~

摘　　要：石英E'_1心是一种重要的顺磁性缺陷,其热活化ESR信号强度的最大值有许多新的应用,但对于获取E'_1心信号强度最大值的方法尚存不同的认识。为了进一步研究和探讨石英E'_1心信号的增强机理及石英 E'_1心ESR信号强度最大值的获取方法,采用电子自旋共振(ESR)技术测量了两个冰碛物样品在300℃等温加热前和加热后石英E'_1心的ESR信号强度,结果表明:在室温下,石英E'_1心信号强度随辐照剂量的增加而增强是由于伪E'_1心的形成而造成的;而石英E'_1心信号强度随辐照剂量增加而减弱可能是因为辐照使已增强的E'_1心产生衰退。300℃的等温热退火实验(分为15 min和20 min)结果表明:获取E'_1 心ESR信号强度的最大值需要人工辐照,人工辐照的作用不仅是提供更多的空穴,而且可能更有利于氧空位向E'_1心转化。Background,aim,and scope The E′1 center in quartz is an important paramagnetic defect,and the maximum value of its thermal activation ESR signal intensity has many new applications.However,there are different views on the method for obtaining the maximum value of the E′1 center intensity.Therefore,in order to further study and discuss the enhancement mechanism of the quartz E′1 center and the condition for obtaining the maximum ESR signal intensity of the quartz E′1 center,it is important to carry out the study on the thermal activation of ESR signal intensity in quartz E′1 center.Materials and methods The Sample A was collected from the bottom part of the moraine in the Urumqi Valley of Xinjiang,China.And the Sample B was collected from the surface part of the moraine in Purog Kangri,Tibetan Plateau.The samples were irradiated by artificial gamma rays at different doses,and then the E′1 center signal intensities of the samples were measured by electron spin resonance(ESR)technology before and after the 300℃ isothermal heating.Results At room temperature,the intensity of the E′1 signal of Sample A is enhanced with the increase of irradiation dose,while the intensity of the E′1 signal of Sample B descends first and then rises gradually with the increase of radiation dose.After heating at 300℃ for 15 min,the E′1 center signal intensities of Sample A increases first with the increase of radiation dose,and then saturates above 400 Gy.For another set of aliquots of Sample A which are heated at 300℃for 20 min,the E′1 center signal intensities are basically the same.For Sample B,the E′1 center signal intensities of the unirradiated(0 Gy)aliquots are smaller than that of the irradiated aliquots,regardless of heating for 15 min or 20 min.Discussion The signal intensity of the E′1 center is enhanced with the increase of irradiation dose at room temperature due to the formation of the counterfeit E′1 center,while the intensity of E′1 center decreases with the increase of radiation dose may

关 键 词：石英E′1心 ESR信号强度 伪E′1心 等温热退火实验 

分 类 号：P618.13[天文地球—矿床学]