LETTER
Preparation and crystal structural properties of Er3+–exchanged GTS–type sodium titanosilicate
2020 年 115 巻 1 号 p. 59-64
詳細
2020 年 115 巻 1 号 p. 59-64
Powder sample of GTS–type sodium titanosilicate (Na–GTS) was prepared using a hydrothermal method. The Er3+–exchanged forms [Na4(1−x)Er4x/3Ti4O4(SiO4)3·nH2O] of Na–GTS with the compositions up to x = 0.96 were obtained by shaking the single–phase sample of Na–GTS in the ErCl3 aqueous solutions (25 mL, 0.01–0.5 M) at 25 and 60 °C for 6 h. The Er3+–exchange experiments revealed that the Er3+–exchange amounts (x) increase with increasing the concentration of ErCl3 aqueous solutions and the higher treatment temperature more effectively promotes ion–exchange. Thermogravimetry–differential thermal analysis (TG–DTA) measurements showed that the exchange of Na+ for Er3+ decreases the dehydration temperature and the H2O content. The simulation of powder X–ray diffraction (XRD) patterns suggests that Er3+ ions occupy both 4e and 6g sites in the assumed psuedocubic structure.
