Topochemistry of zeolites and related materials. 1. Topology and geometry

Smith, J. V.

doi:10.1021/cr00083a008

Cited by 706 publications

(380 citation statements)

References 43 publications

(57 reference statements)

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“…should be considered for new waste form designs in addition to the current choices in debate such as perovskite, pyrochlore, zirconolite, zircon, monazite, and garnet, which are all based on the mechanism of lattice substitution (4-6). For example, zeolites contain numerous types of void spaces that can be used for selectively trapping actinides of certain size and charge (68)(69). In the near future, we will investigate this hypothesis along with other low-dimensional borate materials.…”

Section: Scanning Electron Microscopy and Energy Dispersive Spectromementioning

confidence: 99%

Interstitial Incorporation of Plutonium into a Low-Dimensional Potassium Borate

Wang

Diwu

Simonetti

et al. 2011

Environ. Sci. Technol.

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show that the plutonium present within the crystals is predominantly characterized by an oxidation state of IV. A small amount of Pu(III) is also present initially, but slowly oxidized to Pu(IV) via interaction with oxygen in the air. X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopic measurements confirm that plutonium is mainly present as a form 2 similar to PuO 2 in the void spaces between the borate chains. K[B 5 O 7 (OH) 2 ]·H 2 O:Pu 4+ provides a novel mechanism for incorporating heavy metal contaminants, including actinides, into natural materials.

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Section: Scanning Electron Microscopy and Energy Dispersive Spectromementioning

confidence: 99%

Interstitial Incorporation of Plutonium into a Low-Dimensional Potassium Borate

Wang

Diwu

Simonetti

et al. 2011

Environ. Sci. Technol.

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“…2(a) and (b), respectively. In the latter case both chains can be connected across a mirror plane to form the double crankshaft chain [cc (Smith, 1988) Fig. 2(d)] or across an inversion centre to form the bifurcated hexagonal-square chain [bhs (Smith, 1988) Table 2.…”

Section: Enumerating Some Subgroupsmentioning

confidence: 99%

“…In the latter case both chains can be connected across a mirror plane to form the double crankshaft chain [cc (Smith, 1988) Fig. 2(d)] or across an inversion centre to form the bifurcated hexagonal-square chain [bhs (Smith, 1988) Table 2. It should be noted that the number of nets in this group increases considerably when more than two crankshaft chains are inserted between adjacent CS-type columns.…”

Section: Enumerating Some Subgroupsmentioning

confidence: 99%

“…constructed from 3MS's and 6MS's without any S3R perpendicular to the symmetry axis) {512, pentagondodecahedron, rd (Smith, 1988), sequence 1-3(H)6(H)6(H)3-1 [see for explanation of symbols]} can be linked with identical cages (sharing S5R's) into a hexagonal sheet, which cannot be stacked to form a net of the tridymite group: the trigonal axes with on-axis 1-1 units disappear as a consequence of the particular mode of connecting these cages. This type of hexagonal sheet occurs in the framework types DOH (Gerke & Gies, 1984) and MTN (ZSM-39) (Gies, 1984).…”

Section: Framework Structures Constructed From Face-sharing Group B 2mentioning

confidence: 99%

“…Detailed structural information on established 3D framework structure types and their secondary building units can be found in the revised Atlas of Zeolite Structure Types (Meier & Olson, 1987) and in a comprehensive review by Smith (1988).…”

Section: Introductionmentioning

confidence: 99%

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Towards a general description of hexagonal three-dimensional framework structures: the lateral connection of trigonal columns (LCTC) group

Andries¹

1990

Acta Cryst Sect A

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Hexagonal three-dimensional framework structures are constructed from trigonal columns. When two 0108-7673/90/100855-14503.00 types of trigonal column are distinguished, all hexagonal 3D framework structures known to date can be classified in the lateral connection of trigonal columns (LCTC) group. Also, orthorhombic 3D nets © 1990 International Union of Crystallography 856 THE LCTC GROUP can be constructed from trigonal columns and a number of such hypothetical nets related to the hexagonal 81(i) series of Smith & Dytrych [Nature (London) (1984), 309, 607-608] are enumerated. A systematic investigation of the several ways by which neighbouring trigonal columns can be linked and symmetry related gives rise to a large number of subgroups in the present LCTC group. A general designation for LCTC structures by means of a composite code is proposed.

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Microporous Titanosilicates and other Novel Mixed Octahedral-Tetrahedral Framework Oxides

Rocha

Anderson²

2000

Eur. J. Inorg. Chem.

288

158

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Stable microporous materials, such as zeolites, are extremely important for applications in catalysis, adsorption, ion‐exchange, and separation. In this review we describe a new class of stable microporous materials that involves novel mixed octhaedral‐tetrahedral framework oxides. The archetypal material is based on titanosilicates, although there is tremendous scope for introducing many other transition metals. These materials not only have potential novel applications in the fields normally associated with zeolites but also possible applications in the areas of optoelectronics, nonlinear optics, batteries, magnetic materials and sensors.

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Topochemistry of zeolites and related materials. 1. Topology and geometry

Cited by 706 publications

References 43 publications

Interstitial Incorporation of Plutonium into a Low-Dimensional Potassium Borate

Interstitial Incorporation of Plutonium into a Low-Dimensional Potassium Borate

Towards a general description of hexagonal three-dimensional framework structures: the lateral connection of trigonal columns (LCTC) group

Microporous Titanosilicates and other Novel Mixed Octahedral-Tetrahedral Framework Oxides

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