The effect of thermal excitation on paramagnetic defects in natural sedimentary quartz irradiated with different doses of gamma radiation was studied using electron spin resonance (ESR) spectroscopy. We report a variation in the activation energy and the frequency factor for [AlO₄/h⁺]⁰ and [TiO₄/M⁺]⁰ paramagnetic defects with the gamma dose, for a dose range investigated between ∼100 Gy and ∼40 000 Gy. Our results indicate that both [AlO₄/h⁺]⁰ and [TiO₄/M⁺]⁰ defects are less thermally stable above 1 kGy–2 kGy than below this dose range. The correlation between the two kinetic parameters (activation energy and frequency factor) satisfies the Meyer–Neldel rule. A linear correlation was found between the amplitude of the ESR signals of [AlO₄/h⁺]⁰ and [TiO₄/M⁺]⁰ paramagnetic defects corresponding to different doses after the application of thermal treatments in the pulse annealing procedure. We propose a mechanism involving the exchange of the cation, assigned mainly to Li⁺ here, between the two defects. Under irradiation, the cation is removed from [AlO₄/M⁺]⁰ (forming [AlO₄/h⁺]⁰) to [TiO₄]⁻ (forming [TiO₄/M⁺]⁰), while under heating, the reverse mechanism takes place. The migration energy of the cation from one defect to another was found to be about 51 meV, corresponding to a temperature of about 325 °C.

中文翻译：

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对辐照沉积石英中[AlO4 / h +] 0和[TiO4 / M +] 0顺磁中心的补偿效应（Meyer–Neldel法则）

使用电子自旋共振（ESR）光谱研究了热激发对天然沉积石英中不同剂量的伽马射线辐照的顺磁缺陷的影响。我们报告了[AlO ₄ / h ⁺ ] ⁰和[TiO ₄ / M ⁺ ] ⁰顺磁缺陷的活化能和频率因数随γ剂量的变化，其剂量范围在约100 Gy和约40 000之间Gy。我们的结果表明[AlO ₄ / h ⁺ ] ⁰和[TiO ₄ / M ⁺ ] ⁰1 kGy–2 kGy以上的缺陷比低于此剂量范围的热稳定性差。两个动力学参数（活化能和频率因子）之间的相关性满足Meyer–Neldel规则。在脉冲退火程序中进行热处理后，发现与不同剂量对应的[AlO ₄ / h ⁺ ] ⁰和[TiO ₄ / M ⁺ ] ⁰顺磁缺陷的ESR信号的幅度之间存在线性关系。我们提出了一种机制，涉及在两个缺陷之间交换主要分配给Li ⁺的阳离子。在照射下，阳离子从[AlO ₄ / M ⁺ ]中除去⁰（形成[AlO ₄ / h ⁺ ] ⁰）至[TiO ₄ ] ^-（形成[TiO ₄ / M ⁺ ] ⁰），在加热下发生相反的机理。发现阳离子从一个缺陷迁移到另一个缺陷的迁移能为约51 meV，对应于约325°C的温度。