Electrolysis Of Alkali Halide And Alkaline Earth Halide Crystals And Electrolysis Mechanism

In this work, SrF₂:Li⁺ and NaCl:OH-crystals were electrolyticallycolored for the first time, and NaCl, NaCl:K⁺ and KBr crystals weresuccessfully colored. A lot of color centers were produced in theelectrolytically colored crystals. Systematical observation and analysis werecarried out to the colored crystals, and production and conversion mechanismwas presented, which lays a foundation for the further research andapplication of the crystals. KCl and KBr crystals were implanted with xenonions for comparison.A lot of F, M and M⁺ color centers were produced in the SrF₂:Li⁺crystals after the electrolytic coloration with a pointed cathode. Thesuccessful electrolytic colorations should mainly benefit appropriate impuritycontent, coloration temperature and electric field strength. In the electrolysis,various color centers were easily and efficiently obtained through asingle-step procedure without complex treatment used in the other colorationmethods, which shows that the electrolysis has bigger practicability. Thecolor centers produced by the electrolysis are very stable at room temperature,which is favorable to further research and application.A lot of V, F, R, M, N and colloid color centers were produced in theNaCl:OH-crystals after the electrolytic colorations with a pointed cathode.Calculated activation energy of the V color center is smaller than that of the Fcolor center in the crystal, which shows that the V color centers are producedmore easily than the F color centers. On the basis of the research results, it ispresented that the original color center is V color center and not the previousF color center, and a unique anode matrix used makes the electrolyticcolorations successful, however, the electrolytic coloration of the crystaldoped with anions was previously considered as impossible. The F colorcenters in the colored crystal come from the conversion of the V color centers,and F-aggregate color centers from the aggregations of the F color centers.By using measured current-time curves, the mechanism of the electrolyticcoloration was well understood. The NaCl:OH-crystals were efficientlycolored with a pointed anode, and a lot of V color centers were produced inthe colored crystals. By using calculated activation energy of the V colorcenter and measured current-time curves, mechanism explanation of the colorcenter formation for the electrolytically colored crystals is presented.A lot of V, F, N, colloid and ML, F, R, M, N, R', M+, N+ color centerswere produced in the NaCl, NaCl:K+ and KBr crystals after electrolyticcolorations with a pointed cathode, respectively. Research results show thatthe longer coloration time and higher voltage are applied, the deeper crystalcoloration is obtained, and the formed color center types can be adjusted byillumination. By using measured current-time curves of the KBr crystals, thecorresponding electrolytic procedure was well understood.