A novel representative {l_brace}[Rb{sub 1.94}(H{sub 2}O,OH){sub 3.84}](H{sub 2}O){sub 0.1}{r_brace}{l_brace}Al{sub 4}(OH){sub 4}[PO{sub 4}]{sub 3}{r_brace} in the pharmacosiderite structure type
Journal Article
·
· Crystallography Reports
- Philipps-Universitaet Marburg (Germany)
- Lomonosov Moscow State University (Russian Federation)
The crystal structure of a new synthetic aluminophosphate {l_brace}[Rb{sub 1.94}(H{sub 2}O,OH){sub 3.84}](H{sub 2}O){sub 0.1}{r_brace}{l_brace}Al{sub 4}(OH){sub 4}[PO{sub 4}]{sub 3}{r_brace} synthesized under mild hydrothermal conditions (T = 280{sup o}C, P = 100 atm) in the Rb{sub 2}O-Al{sub 2}O{sub 3}-P{sub 2}O{sub 5}-H{sub 2}O system is determined using X-ray diffraction (Stoe IPDS diffractometer, {lambda}MoK{sub {alpha}}, graphite monochromator, 2{theta}{sub max} = 64.33{sup o}, R = 0.032 for 312 reflections). The main crystal data are as follows: a = 7.4931(6) A, space group P 4 bar 3m, Z = 1, and {rho}{sub calcd} = 2.76 g/cm{sup 3}. It is shown that the synthesized compound belongs to the pharmacosiderite structure type with a characteristic mixed open microporous framework composed of octahedra and tetrahedra. A comparative crystal chemical analysis of related phases is performed, and the chemical compositions of promising absorbents, i.e., hypothetical compounds potentially possible in the structure type under consideration, are proposed. It is established that pharmacosiderite and rhodizite are homeotypic to each other.
- OSTI ID:
- 22050978
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 3 Vol. 53; ISSN 1063-7745; ISSN CYSTE3
- Country of Publication:
- United States
- Language:
- English
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