Elucidation of the centers responsible for the TL peaks in the anhydride crystal
Elucidation of the centers responsible for the TL peaks in the anhydride crystal
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阐明酸酐晶体中 TL 峰的中心
DOI：
10.1016/j.jlumin.2020.117082
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发表时间：
2020
影响因子：
3.6
通讯作者：
S. Watanabe
中科院分区：
文献类型：
--
作者：
N. F. Cano;T. Rao;Betzabel N. Silva;Sofia P.S. Cruz;Henry S. Javier;Yaan A. Bedoya;J. Ayala;S. Watanabe
在150、200、268和338℃的温度下，经伽玛射线照射后的酸酐呈现出四个热释光峰。利用初始上升和辉光曲线反褶积（GCD）方法确定了与主要TL峰相关的动力学参数，即活化能、频率因子和动力学阶数。利用电子自旋共振（ESR）技术研究了γ射线辐照在该矿物中引起的缺陷中心，以期确定与TL过程有关的缺陷中心。在室温下观察到的ESR谱是至少六个缺陷中心的叠加。principal -valuesg||= 2.011和g⊥= 2.012的中心I被鉴定为(SO4) -自由基，中心与200°C时的TL峰相关。中心II、III和IV具有轴向张量的特征，这三个中心都归属于(SO4)−自由基。这些中心与268°C TL峰相关。中心V的各向同性值为1.9953，属于(SO3)−自由基，该自由基也与268°C TL峰有关。中心VI的各向同性因子为2.015，属于本征O -型中心，该中心与268°C时的TL峰相关。中心VII呈现菱形张量，归属于(SO3)−自由基。
The mineral anhydride after gamma irradiation displays four thermoluminescence (TL) peaks at 150, 200, 268 and 338 °C. The kinetic parameters, namely activation energy, frequency factor and kinetic order associated with the main TL peaks have been determined using initial rise and glow curve deconvolution (GCD) methods. Defect centers induced in the mineral by gamma irradiation are studied by electron spin resonance (ESR) with a view to identify the centers responsible for the TL process. ESR spectrum at room temperature is observed to be a superposition of at least six defect centers. Center I with principalg-valuesg||= 2.011 andg⊥= 2.012 is identified as (SO4)−radical and the center relates to the TL peak at 200 °C. Centers II, III and IV are characterized by axialg-tensors and all these three centers are assigned to (SO4)−radicals. These centers correlate with the 268 °C TL peak. Center V with an isotropicg-value equal to 1.9953 is attributed to (SO3)−radical and the radical is also associated with the 268 °C TL peak. Center VI having an isotropicgfactor 2.015 is assigned to an intrinsic O−type center and the center correlates with the TL peak at 268 °C. Center VII displays a rhombicg-tensor and is ascribed to (SO3)−radical.
影响因子：
2.7
作者：
Misra SK;Andronenko SI;Tipikin D;Freed JH;Somani V;Prakash O
通讯作者：
Prakash O