Crystal structure of a synthetic lithium zeolite

Kerr, I. S.

doi:10.1524/zkri.1974.139.3-5.186

Cited by 55 publications

(17 citation statements)

References 4 publications

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“…Both materials are based on the 4 2 6 3 8-a network (Smith, 1977;Wells, 1979) observed for zeolite ABW (Kerr, 1974). This is one of several four-connected networks that can be constructed by allowing a tetrahedral point to make three connections within a layer and the fourth to an adjacent layer (Feng et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Henry

Kimber

Argyriou

2010

Acta Crystallogr Sect B

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Rubidium copper phosphate, RbCuPO(4), forms two room-temperature polymorphs that have been investigated with neutron powder diffraction. Polymorph (II) can be converted quantitatively into (I) by grinding the material or by pelletization, and the phase transition is accompanied by a significant colour change from very pale green to sky blue. Polymorph (II) can be obtained essentially free of (I) by quenching from 723 K. Each polymorph shows two unique Cu atoms: in (I) both sites are four-coordinate in a 2:1 ratio, whereas in (II) the atoms are four- and five-coordinate in a 1:1 ratio. In each case these sites are linked by phosphate tetrahedra to form three-dimensional frameworks based on the 4(2)6(3)8-a four-connected net. The Rb atoms are hosted in the six- and eight-ring channels that are similar to those observed in zeolite ABW. The (II) --> (I) phase transition is also accompanied by a volume reduction of 2.1% even though the average coordination of the Cu atoms also falls. The structures of the polymorphs are critically examined and compared with those of KNiPO(4) and KCuPO(4) in terms of hexagonal close packing containing ordered phosphate arrays. As a result of buckling of the six-ring layers, one-dimensional chains of dimerized copper polyhedra are identified in (II), chains that become trimers with mirror symmetry in (I).

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Section: Discussionmentioning

confidence: 99%

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Henry

Kimber

Argyriou

2010

Acta Crystallogr Sect B

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“…When considered in isolation (Smith, 1977), the SSCSSC ring forms the LiAlSiO 4 Á H 2 O (Li-ABW) zeolite (Kerr, 1974) topology, and the SSSCSC ring occurs in 1 Additional material to this paper can be ordered referring to the no. CSD 411142, names of the authors and citation of the paper at the Fachinformationszentrum Karlsruhe, Gesellschaft fu Èr wissenschaftlich-technische Information mbH, D-76344 EggensteinLeopoldshafen, Germany.…”

Section: Discussionmentioning

confidence: 99%

“…The phases CsZnPO 4 [three temperature-dependent modifications] (Blum, Durif, Averbuch-Pouchot, 1986), RbZnPO 4 (Elammari, Elouadi, 1991), and NaZnPO 4 -ABW (Ng, Harrison, 1998) crystallise in different space groups, but are all topologically equivalent to the zeolite ABW (LiAlSiO 4 H 2 O) framework (Kerr, 1974), as was also recently noted by Kahlenberg (1998). Finally, it may be observed that a-AgZnPO 4 (Hammond, Barbier, Gallardo, 1998), b-NH 4 ZnPO 4 (Harrison, Sobolev, Phillips, 1999) and a-KZnPO 4 (Andratschke, Range, Haase, Klement, 1992) are topologically equivalent: the 3 p supercell in the a direction in the latter phase might arise from a different arrangement of extra-framework cations in the [001] channels, from framework relaxation of the symmetry-restrained linear T± ±O± ±T bond in b-NH 4 ZnPO 4 , or from a combination of these effects.…”

Section: Prototype Phasementioning

confidence: 99%

Na_3/4(NH₄)_1/4ZnPO₄, a new framework zincophosphate. Survey of MZnPO₄ tetrahedral topologies

Harrison¹

2000

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Lisitsynite and synthetic Li-A(BW) zeolite {Li[AlSiO 4 ] •H 2 O, a 10.313(1), b 8.194(1), c 4.993(1) Å, Pna2 1 , Z = 4; [Kerr (1974), Krogh Andersen & Ploug-Sørensen (1986)} have similar cell-dimensions and identical main building-units: four-, six-and eight-membered rings of tetrahedra and the same type of puckered-ladder arrangement of four-membered rings. However, because of the different connectivity of the rings, the topologies of lisitsynite and Li-A(BW) are different.…”

Section: Related Compoundsmentioning

confidence: 99%

THE CRYSTAL CHEMISTRY OF MALINKOITE, NaBSiO4, AND LISITSYNITE, KBSi2O6, FROM THE KHIBINA LOVOZERO COMPLEX, KOLA PENINSULA, RUSSIA

Sokolova¹,

Hawthorne²,

Khomyakov³

2001

The Canadian Mineralogist

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The crystal structure of malinkoite, NaBSiO 4 , a 13.8964(4) Å, c 7.7001(2) Å, P6 3 , Z = 18, D x = 2.922 g cm -3 , from the Khibina-Lovozero complex, Kola peninsula, Russia, has been solved by direct methods and refined to an R index of 3.8% using 2094 unique observed (|F o | > 4F) reflections collected with a single-crystal diffractometer fitted with a CCD detector and MoK␣ X-radiation. Malinkoite is a framework borosilicate with a structure consisting of six-membered rings of regularly alternating (SiO 4 ) and (BO 4 ) tetrahedra, and Na located in the large channels extending along [001]. There are three unique Si sites, each occupied by Si and each coordinated by four O atoms in a tetrahedral arrangement, with distances of 1.625, 1.622 and 1.622 Å, respectively. There are three unique B sites, each occupied by B and each coordinated by four O atoms in a tetrahedral arrangement, with distances of 1.476, 1.476 and 1.473 Å, respectively. There are five unique Na sites, each completely occupied by Na. Three of the Na sites are [9]-coordinated, with distances of 2.626, 2.642 and 2.630 Å, respectively; the remaining two Na sites are [6]-coordinated, with distances of 2.444 and 2.440 Å, respectively. The (SiO 4 ) and (BO 4 ) tetrahedra link to form six-membered rings of two different configurations based on the following sequences of up (U) and down (D) linkages: UDUDUD and UUDUDD in the ratio of 1:2. Nine-coordinated Na polyhedra are located in big cages formed by stacking of UDUDUD rings. Stacking of UUDUDD rings produces smaller cages occupied by [6]-coordinated Na. In accord with the ratio of two types of rings, there are twelve Na octahedra and six [9]-coordinated Na polyhedra per unit cell in malinkoite. The framework topology is related to that of beryllonite NaBePO 4 .In the crystal structure of lisitsynite, KBSi 2 O 6 , four-membered rings consist of two (SiO 4 ) and two (BO 4 ) tetrahedra, and are linked into zig-zag chains (puckered ladders) along [001]. There are two types of chemically distinct six-and eight-membered rings: (4Si + 2B) and (5Si + B); (5Si + 3B) and (6Si + 2B). Two different pairs of six-membered and eight-membered rings, (4Si + 2B) and (5Si + 3B), and (5Si + B) and (6Si + 2B), respectively, form sheets on (100) and (010). Stacking of sheets and zig-zag chains gives rise to a three-dimensional framework. There are one-dimensional seven-ring channels along the c direction. Lisitsynite, KBSi 2 O 6 , and synthetic "boroleucite", K(Si 2 B)O 6 , may be regarded as polymorphs with different patterns of Si-B order. SOMMAIRE Nous avons résolu la structure cristalline de la malinkoïte, NaBSiO 4 , a 13.8964(4), c 7.7001 (2) Å, P6 3 , Z = 18, D x = 2.922 g cm -3 , provenant du complexe de Khibina-Lovozero, péninsule de Kola, en Russie, par méthodes directes, et l'avons affiné jusqu'à un résidu R de 3.8% en utilisant 2094 réflexions uniques observées (|F o | > 4F), prélevées avec un diffractomètre pour cristaux uniques muni d'un détecteur CCD et avec rayonnement MoK␣. Il s'...

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Crystal structure of a synthetic lithium zeolite

Cited by 55 publications

References 4 publications

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Na_3/4(NH₄)_1/4ZnPO₄, a new framework zincophosphate. Survey of MZnPO₄ tetrahedral topologies

THE CRYSTAL CHEMISTRY OF MALINKOITE, NaBSiO4, AND LISITSYNITE, KBSi2O6, FROM THE KHIBINA LOVOZERO COMPLEX, KOLA PENINSULA, RUSSIA

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Crystal structure of a synthetic lithium zeolite

Cited by 55 publications

References 4 publications

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO4

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO4

Na3/4(NH4)1/4ZnPO4, a new framework zincophosphate. Survey of MZnPO4 tetrahedral topologies

THE CRYSTAL CHEMISTRY OF MALINKOITE, NaBSiO4, AND LISITSYNITE, KBSi2O6, FROM THE KHIBINA LOVOZERO COMPLEX, KOLA PENINSULA, RUSSIA

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Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Polymorphism and piezochromicity in the three-dimensional network-based phosphate RbCuPO₄

Na_3/4(NH₄)_1/4ZnPO₄, a new framework zincophosphate. Survey of MZnPO₄ tetrahedral topologies