Oxide Formations from Molten Salt Systems and Their Applications

熔盐体系中的氧化物生成反应在新氧化物材料的生产、核燃料后处理和腐蚀防护等工程应用方面具有重要意义。本课题的目的是利用熔盐作为反应介质合成几种氧化物，并对它们进行表征，主要结果如下：（1）电分析法和稳定氧化锆-空气电极指示电极法都能有效地测定氧化物离子浓度。(2)建立了LiF-KF- <O^（2-）>体系中Ni的电位- <pO^（2-）>图。(3)本文合成了ZnO<Al_2><O_3>、Th<O_2>、U<O_2>，并对其进行了表征，用氧化锆指示剂测定了它们的溶度积。(4)此外，作为该项目的副作用，建立了电沉积难熔金属及其碳化物的新方法。

Oxide formation reactions in a molten salt system is very important from many engineering aspects, such as new oxide material production, nuclear fuel reprocessing and corrosion protection. The aim of this project is to synthesize several kinds of oxide by the use of molten salt as a reaction media and to characterize them taking into account the above engineering aspects.The major results are :(1) Both electroanalytical method and stabilized zirconia - air electrode indicator electrode method have been confirmed to be effective to measure oxide-ion concentration.(2) Potential - <pO^(2-)> diagram of Ni in a LiF-KF- <O^(2-)> system has been established.(3) ZnO, <Al_2> <O_3> , Th <O_2> and U <O_2> have been synthesized and characterised, and their solubility products have been veasured by using the zirconia indicator.(4) In addition, as a side effect of this project, new method of electrodepositing refractory metals and their carbides has been established.