Study about functionalizations of transparent oxides utilizing a high-pressure apparatus

研究了带式高压装置中产生压力(&lt；3.7 Gpa)的精度提高，以及在受压部件(砧座/气缸、垫片等)因外界温度引起的温度波动下产生压力的重现性。结果表明，压力误差在~0.2 Gpa范围内减小，不到原装置的一半。利用该装置研究了钙铝石结构氧化铝(C12A7)中钙离子与镁、锶离子的置换反应。没有形成掺镁的C12A7晶体，但得到了掺锶的C12A7晶体，并合成了C12A7-S12A7晶体的固溶体。

Accuracy enhancements of generated pressures (<3.7 G Pa) in a belt-type high-pressure apparatus as well as reproducibility of generated pressure under temperature fluctuation of pressure members (anvil/cylinder, gasket etc) due to outside temperatures were examined. As a result, pressure error was reduced within ~0.2 G Pa, which was less than a half of that in a previous setup. Using this setup, replacements of Ca ions with Mg and Sr ions in calcium aluminum oxides with Mayenite-structure (C12A7) were examined. Mg-doped C12A7 crystals were not formed, but Sr-doped C12A7 were obtained and solid solutions of C12A7-S12A7 crystals were synthesized.