Preparation et affinement de la structure d'un silicate a double chaines d'yttrium et de trisodium

Bourguiba, Noura Fakhar; Dogguy, Leila Smiri

doi:10.1016/0025-5408(94)90075-2

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The main structural features of the four A 3 MSi 6 O 15 -(•nH 2 O) silicates synthesized in the present work are summarized in Table 2 along with similar data for four related silicates: ␤-Na 3 YSi 6 O 15 (Bourguiba and Dogguy 1994); dalyite, K 2 ZrSi 6 O 15 (Fleet 1965); armstrongite, CaZrSi 6 O 15 (Kashaev and Sapozhnikov 1978); and K 2 CeSi 6 O 15 (Karpov et al 1976). All of the structures are based on linkages of SiO 4 tetrahedra that share three of their four O corners with a corner of a neighboring SiO 4 group.…”

Section: Overview Of Structures To Be Consideredsupporting

confidence: 56%

“…It does not reflect the spread in individual values used to calculate the average. Sources: (a) Shumyatskaya et al (1980); (b) Bourguiba and Dogguy (1994); (c) Fleet (1965); (d) Gerbert et al (1983); Lazebnik et al (1984); (e) Kashaev and Sapozhnikov (1978); (f ) Karpov et al (1976 (Robinson and Fang 1970).…”

Section: Double-chain Silicatesmentioning

confidence: 99%

“…These features provide a capacity for accommodation of cations of varying size and valence, attributed by Gunawardane et al (1982) as the result of the unique ability of this structure to balance local distortions at the tetrahedral (A) and octahedral (M) sites in a manner that minimizes distortions of the silicate chain. Bourguiba and Dogguy (1994) suggested that the chain itself is quite flexible. In the case of ␤-Na 3 Y, the distortions at the usually tetrahedral site are so great as to cause the coordination at this site to become eightfold.…”

Section: Double-chain Silicatesmentioning

confidence: 99%

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Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Haile

Wuensch

1997

American Mineralogist

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The structures of four A 3 MSi 6 O 15 (•nH 2 O) silicates (A ϭ Na or K, M ϭ Nd or Y) recently determined by the authors are compared with one another and with the structures of related silicates. The 2:5 Si:O ratio in these compounds (silicate tetrahedra linked by sharing three O atoms per tetrahedron plus one unshared O atom) permits layer, double-chain, or doublering configurations. In ␣-K 3 NdSi 6 O 15 •2H 2 O, ␤-K 3 NdSi 6 O 15 , and Na 3 NdSi 6 O 15 •2H 2 O, the linkage is found to result in a corrugated layered structure, in ␤-Na 3 YSi 6 O 15 a double-chain structure, and in ␣-Na 3 YSi 6 O 15 a unique double-ring structure. Although the factors that govern the stabilities of ring vs. chain vs. layered structures remain to be completely elucidated, it is apparent in the layered structures that larger M cations (such as Nd and Ce) produce a greater degree of corrugation than do Zr and Ti cations. The more open structures of neodymium and cerium silicates contain large channels that may serve as pathways for fast alkali ion transport.

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Section: Overview Of Structures To Be Consideredsupporting

confidence: 56%

Section: Double-chain Silicatesmentioning

confidence: 99%

Section: Double-chain Silicatesmentioning

confidence: 99%

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Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Haile

Wuensch

1997

American Mineralogist

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“…[1,2] The two symmetry-equivalent six-membered (Si-O) rings of the cyclotrisilicate anion [Si 6 O 16 ] 8-are in a flat boat conformation (two O b atoms below and one above the Si-ring plane), unlike the other silicates containing cyclotrisilicate anions with a chair conformation of the six-membered (Si-O) rings ( Figure S1, Supporting Information). [3,7,[13][14][15] Charge compensation within the structure is accomplished by Cs + cations occupying the voids between the anions. The cations are irregularly coordinated to seven to ten oxygen ligands at distances between 2.922(4) and 3.723(3) Å.…”

Section: Resultsmentioning

confidence: 99%

The New Alkali Cyclotrisilicate Cs₈[Si₆O₁₆]

Hlukhyy

Fässler

2012

Zeitschrift anorg allge chemie

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“…The alkali metal rare earth silicates have several important physical properties such as ionic conductivity, luminescence, scintillation and lasing. [1][2][3][4][5][6] There are many different formulas for the alkali rare earth silicates but one very common one is A3RESi6O15. [7] Most exploratory synthetic investigations focus on sodium and potassium, and the phase space is quite broad for those alkali ions.…”

mentioning

confidence: 99%