Fluorine Adsorption and Diffusion in Polycrystalline Silica Page: 1
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Jin, Jian-Yue, Fluorine Adsorption and Diffusion in Polycrystalline Silica.
Doctor of Philosophy (Physics), December, 1998, 80 pp., 31 illustrations, references, 72
The measurement of fluorine penetration into archeological flint artifacts using
Nuclear Reaction Analysis (NRA) has been reported to be a potential dating method.
However, the mechanism of how fluorine is incorporated into the flint surface, and finally
transported into the bulk is not well understood. This research focuses on the study of the
fluorine uptake phenomenon of flint mineral in aqueous fluoride solutions. Both
theoretical and experimental approaches have been carried out. In a theoretical approach,
a pipe-diffusion model was used to simulate the complicated fluorine transportation
problem in flint, in which several diffusion mechanisms may be involved.
A comprehensive experimental study was carried out. Scanning Electron
Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray Fluorescence
Analysis (XRF) have been employed to study the microstructure and characteristics of the
sample materials. The NRA method was used to measure the fluorine and hydrogen
depth profiles in flint. Elastic Recoil Detection (ERD) was developed to monitor the
etching and dissolution of silica by the fluoride solution.
The fluorine uptake phenomenon was experimentally simulated by immersing
flint samples in sodium fluoride solutions with different fluoride concentrations and pH
values, at different temperatures, and for different times. The results suggest that fluorine
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Jin, Jian-Yue. Fluorine Adsorption and Diffusion in Polycrystalline Silica, dissertation, December 1998; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc277986/m1/2/: accessed August 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .