Self-diffusion of fluorine in molten dilithium tetrafluoroberyllate
Self-diffusion of fluorine in molten dilithium tetrafluoroberyllate
复制标题
氟在熔融四氟铍酸二锂中的自扩散
DOI：
10.1021/j100555a022
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
K. Furukawa
中科院分区：
文献类型：
--
作者：
T. Ohmichi;H. Ohno;K. Furukawa
本文用毛细管贮库技术，以~（18）F为示踪剂，测定了F在熔融Li_2BeF_4中的自扩散系数。18F在我们实验室制备。结果可用Ar-Meius方程D= 6.53 × 103 exp [-（30.6±3.4）× 103/RT]描述，其中D以cm ~ 2·s ~（-1）表示，R以cal·mol ~（-1）·deg ~（-1）表示，T以K表示。对氟自扩散的高活化能作了定性解释。可能的机制包括氟铍酸盐阴离子的迁移、相邻阴离子之间的氟交换和离子对扩散。
The self-diffusion coefficients of fluorine in molten Li2BeF4 have been measured with the capillary reservoir technique, using 18F as a tracer. 18F was prepared in our laboratory. The results can be described with the Ar-rhenius equation D= 6.53 X 103 exp [—(30.6±3.4) X 103/RT], where D is expressed in cm2 s-1, R in cal mol-1 deg-1, and T in K. An attempt was made to qualitatively explain thehigh activation energy of fluorine self-diffusion. Possible mechanisms involve the transport of fluorine resulting from the movement of fluoroberyllate anions, the exchange of fluorinebetween neighboring anions, and ion-pair diffusion.