HONG, SB SEO, JS PYUN, CH KIM, CH UH, YS 2024-01-21T21:14:22Z 2024-01-21T21:14:22Z 2021-09-02 1995-01 1011-372X https://pubs.kist.re.kr/handle/201004/145421 The variation of the cation location and occupancy at different sites in TbNa-Y zeolites as a function of treatment temperature is monitored by luminescence spectroscopy. It is found that the spectral changes caused by thermal treatments can be qualitatively rationalized in terms of the site symmetry around the Tb(III) ion. The luminescence results demonstrate that most of the Tb(III) ions exchanged into supercages of the zeolite migrate first to sodalite cages at temperatures lower than 473 K and then migrate to hexagonal prisms between 473 and 523 K. English BALTZER SCI PUBL BV RARE-EARTH IONS CATION DISTRIBUTION EXCHANGED-ZEOLITE METAL NMR DIFFRACTION TRANSITIONS EU-3+ LOCATION OF TB(III) IONS IN NA-Y ZEOLITE DETERMINED BY LUMINESCENCE SPECTROSCOPY Article 10.1007/BF00813675 1 CATALYSIS LETTERS, v.30, no.1-4, pp.87 - 97 CATALYSIS LETTERS 30 1-4 87 97 scie scopus A1995QE23400009 2-s2.0-34249761676 Chemistry, Physical Chemistry Article RARE-EARTH IONS CATION DISTRIBUTION EXCHANGED-ZEOLITE METAL NMR DIFFRACTION TRANSITIONS EU-3+ LOCATION OF TB(III) IONS IN NA-Y LUMINESCENCE SPECTROSCOPY THERMAL TREATMENTS MIGRATION