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- W2516465897 abstract "A new inorganic scintillator has been prepared by the assembly of thallium, zirconium, and chloride ions in a zeolite. Also, for the first time, a 4+ cation has been exchanged directly into a zeolite. From |Na12(H2O)x|[Si12Al12O48]-A (zeolite LTA), |Zr1.7Tl5.4Cl1.7|[Si13.5Al10.5O48]-A and |Zr2.1Tl1.6Cl3.0|[Si17.4Al6.6O48]-A were prepared by the thallous ion exchange (TIE) method: fully dehydrated Tl12-A was treated with ZrCl4 (g, 3.7 × 103 Pa) at 553 and 623 K, respectively. Their crystal structures were determined by single-crystal crystallography using synchrotron X-radiation and their compositions were partially confirmed by SEM-EDX analyses. Their structures were refined in the space group Pm3m (a = 12.215(1) and 11.945(1) Å) with all unique data to the final error indices R1 = 0.047 and 0.075 for the 680 and 380 reflections for which Fo > 4σ(Fo), respectively. Extraframework Zr4+ and Zr2+ ions had replaced some of the Tl+ ions in Tl12-A. Some Zr4+ ions are 4-coordinate with three bonds to framework oxygen atoms and one to a Cl– ion; others are 5-coordinate, bonding to two Cl– ions. Tetrahedral Zr2+ was found as ZrCl42– in |Zr2.1Tl1.6Cl3.0|[Si17.4Al6.6O48]-A; each of its Cl– ions bonds linearly to a Zr4+ ion, which in turn bonds linearly to another Cl– ion to form Zr5Cl810+ clusters centered in and extending out of the sodalite cavities. The Tl+ ions are in the large cavities. The X-ray induced emission spectrum of Zr,Tl,Cl-A has a broad band between 330 and 750 nm, peaking at 490 nm. The integrated light yield observed for Zr,Tl,Cl-A powder is about five times greater than that of anthracene, a well documented scintillator. This strong radioluminescence appears to be due to the simultaneous presence of Zr and Tl within the zeolite." @default.
- W2516465897 created "2016-09-16" @default.
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- W2516465897 date "2015-07-30" @default.
- W2516465897 modified "2023-10-18" @default.
- W2516465897 title "Exchange of a Tetrapositive Cation into a Zeolite and a New Inorganic Scintillator. I. Crystal Structures and Scintillation Properties of Anhydrous Zr<sub>1.7</sub>Tl<sub>5.4</sub>Cl<sub>1.7</sub>–LTA and Zr<sub>2.1</sub>Tl<sub>1.6</sub>Cl<sub>3.0</sub>–LTA" @default.
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- W2516465897 doi "https://doi.org/10.1021/acs.jpcc.5b04859" @default.
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