辐照条件下绿柱石通道中顺磁配合物的ESR行为  

ESR BEHAVIOUR OF PARAMAGNETIC MIXTURE IN IRRADIATED BERYL

作　　者：亓利剑[1] 向长金[2] 刘国根[3] 裴景成[1] 罗永安[1] 

机构地区：[1]中国地质大学,湖北武汉430074 [2]中国工程物理研究院,四川绵阳610003 [3]中南大学测试中心,湖南长沙410083

出　　处：《地质科技情报》2001年第2期59-64,共6页Geological Science and Technology Information

基　　金：国家自然科学基金资助项目 ( 4 9772 0 96)

摘　　要：四川平武贫铁富碱型无色绿柱石通道中主要存在碱氢化物 ( Na H)、[Fe2 ( OH) 4] 2 +多聚合离子及 OH自由基 ,在电子辐照作用下 ,通道中顺磁配合物的结构、带电性质及化学键易发生转型、裂解和变价 ,并形成自旋浓度不等的 [H0 ] i 心 (裂距为 5 0 0G,g值分别为 2 .175 7,1.8774的二重超精细结构线 )、[Fe3 + ] OH( g=2 .0 0 3 1)和 [Fe3 + 4] s( g=4.3 172 )等辐照损伤心。 [Fe3 + ] OH心属一种有效的电子陷阱 ,其热稳定性大于 [Fe3 + 4] s心。绿柱石中杂质铁离子的占位方式 ,与成矿物理、化学条件及成矿流体的 p H值密切相关。由电子辐照作用而导致杂质离子价态的转变 ,属一种可逆的动态平衡过程。The NaH, [Fe2 (OH)4]2+ polymeric mixture, and OH free radical are present in the channel of the beryl, poor in iron and rich in alkali and colorless in Sichuan Province. Affected by the charged particles in the irradiation field, the paramagnetic mixture structure, electrical-charged property, and chemical bonds are easy to transform, decompose, and change in valence, resulting in the centers with unequal spinning concentrations such as [H0]i centers (whose splitting distance is 500 G, and whose g factors of the double hyperfine structural lines lie at 2.175 7 and 1.877 4, respectively) and [Fe3+]OH centers (g factor is 2.003 1)and [Fe43+]3 centers(g factor is 4. 317 2). This resear shows that the [Fe3+]OH centers is an effective electronictrap, whose thermal stapility is greater than that of [FE43+]3 centers. It also verifies that the occupa tion of the impure Fe ion in the beryl is conspicuously restrained by both the corresponding mineralized physical and chemical conditions and the pH value of the mineralized fluid, with the corresponding change in the valence state defined as a kind of reversible dynamic equilibrium process.

关 键 词：绿柱石 ESR谱 辐照条件 顺磁配合物 铁离子 成矿流体 电子自旋共振 

分 类 号：P578.969[天文地球—矿物学]