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Syntheses and Structures of Two Ammonium Zinc Gallophosphates: Analcime and Paracelsian analogs

✍ Scribed by Nataša Zabukovec Logar; Maja Mrak; Venčeslav Kaučič; Amalija Golobič

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 305 KB
Volume: 156
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.9027

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✦ Synopsis

Two ammonium zinc gallophosphates (I) (NH 4 ) 16 [Zn 16 Ga 8 P 24 O 96 ] and (II) (NH 4 ) 4 [Zn 4 Ga 4 P 8 O 32 ] were hydrothermally synthesized and characterized using single crystal X-ray di4raction. The (I) (NH 4 ) 16 [Zn 16 Ga 8 P 24 O 96 ] crystallizes in a cubic I 2 1 3 space group (a ‫؍‬ 13.456(1) A s , V ‫؍‬ 2436.5(5) A s 3 , R (on F) ‫؍‬ 2.47%, R w (on F) ‫؍‬ 2.48%). It has a zeolite analcime topology with distorted eight-member ring channels. Zn and Ga atoms share the same crystallographic site with a partial occupancy of Zn/Ga ‫؍‬ 0.67/0.33. Ammonium ions lie on the three-fold crystallographic axes and compensate for a negatively charged framework. The second compound (II) (NH 4 ) 4 [Zn 4 Ga 4 P 8 O 32 ] has a monoclinic symmetry (P2 1 /a, a ‫؍‬ 9.406(1) A s , b ‫؍‬ 9.881(1) A s , c ‫؍‬ 8.612(1) A s , ‫؍‬ 90.58(1)3, R (on F) ‫؍‬ 2.7%, R w (on F) ‫؍‬ 3.0%). It is isostructural with a feldspar paracelsian. Zinc and gallium occupy two crystallographic sites with a partial occupancy of Zn(1)/Ga(1) ‫؍‬ 0.53(6)/0.47(6) and Zn(2)/Ga(2) ‫؍‬ 0.47(6)/0.53(6). Ammonium ions lie in the elliptical eight-member ring openings of the three-dimensional framework.

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