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kanemite

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Journal Article

Temperature- and moisture-dependent powder X-ray diffraction studies of kanemite (NaSi 2 O 4 (OH)·3H 2 O)

Daniela Schmidmair, Volker Kahlenberg, Daniel M. Többens, Herwig Schottenberger, Jochem de Wit, Ulrich J. Griesser
Published: 01 February 2015
Mineralogical Magazine (2015) 79 (1): 103–120.
DOI: https://doi.org/10.1180/minmag.2015.079.1.09
...Daniela Schmidmair; Volker Kahlenberg; Daniel M. Többens; Herwig Schottenberger; Jochem de Wit; Ulrich J. Griesser Abstract The high-temperature- and moisture-dependent behaviour of synthetic kanemite (NaSi 2 O 4 (OH)·3H 2 O or SKS-10 ) has been studied by in situ powder X-ray diffraction. Heating...
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Synthesis and characterization of kanemite from fluoride-containing media: Influence of the alkali cation

Juan I. Corredor, Agustín Cota, Esperanza Pavón, Maria D. Alba
Published: 01 May 2013
American Mineralogist (2013) 98 (5-6): 1000–1007.
DOI: https://doi.org/10.2138/am.2013.4372
...Juan I. Corredor; Agustín Cota; Esperanza Pavón; Maria D. Alba Abstract Kanemite belongs to the group of naturally occurring sodium silicate minerals that was first found in Kanem, at the edge of the Lake Chad, and has been synthesized in different ways from NaOH-SiO 2 mixtures and used...
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Surface heterogeneity of kanemite, magadiite and kenyaite: a high-resolution gas adsorption study

C. EYPERT-BLAISON, F. VILLIÉRAS, L. J. MICHOT, M. PELLETIER, B. HUMBERT, J. GHANBAJA, J. YVON
Journal: Clay Minerals
Published: 01 September 2002
Clay Minerals (2002) 37 (3): 531–542.
DOI: https://doi.org/10.1180/0009855023730056
...C. EYPERT-BLAISON; F. VILLIÉRAS; L. J. MICHOT; M. PELLETIER; B. HUMBERT; J. GHANBAJA; J. YVON Abstract The surface properties of various synthetic layered silicates, Na-kanemite, Na-kenyaite and magadiite, exchanged with H, K and Ca, were examined using high-resolution nitrogen and argon...
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Crystal structure of kanemite, NaHSi 2 O 5 .3H 2 O, from the Aris Phonolite, Namibia

Laurence A. J. Garvie, Bertrand Devouard, Thomas L. Groy, Fernando Camara, Peter R. Buseck
Published: 01 August 1999
American Mineralogist (1999) 84 (7-8): 1170–1175.
DOI: https://doi.org/10.2138/am-1999-7-820
...Laurence A. J. Garvie; Bertrand Devouard; Thomas L. Groy; Fernando Camara; Peter R. Buseck Abstract Kanemite was studied by single-crystal X-ray diffraction. The mineral, ideally NaHSi 2 O 5 .3H 2 O, is orthorhombic (space group Pbcn); unit-cell parameters are a = 4.946(3), b = 20.502(15), c...
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Structure solution from powder data of the hydrous layer silicate kanemite, a precursor of the industrial ion exchanger SKS-6

Silke Vortmann, Jordi Rius, Bernd Marler, Hermann Gies
Published: 01 February 1999
European Journal of Mineralogy (1999) 11 (1): 125–134.
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Kanemite; innercrystalline reactivity and relations to other sodium silicates

K. Beneke, G. Lagaly
Published: 01 August 1977
American Mineralogist (1977) 62 (7-8): 763–771.
...K. Beneke; G. Lagaly Abstract The sodium silicate kanemite (idealized: NaHSi 2 O 5 · 3H 2 O) is shown to have a layer structure probably built up by “Zweiereinfachschichten.” The interlayer water can be reversibly removed, and the sodium ions can be exchanged by organic cations and by protons...
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XRD diagrams of <span class="search-highlight">kanemite</span>: ( a ) Si&#x2F;Na = 1 and ( b ) Si&#x2F;(Na+NH 4 ) = 1. ( c ...

XRD diagrams of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4 ) = 1. ( c ...

Published: 01 May 2013
Figure 1 XRD diagrams of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4 ) = 1. ( c ) Structure of kanemite. T = tridymite and C = cristoballite.
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Projections of the crystal structures of ( a ) <span class="search-highlight">kanemite</span>, ( b ) NaSi 2 O 4 (...

Projections of the crystal structures of ( a ) kanemite, ( b ) NaSi 2 O 4 (...

Published: 01 February 2015
F ig . 6. Projections of the crystal structures of ( a ) kanemite, ( b ) NaSi 2 O 4 (OH)·H 2 O and ( c ) NaSi 2 O 4 (OH) along the directions of the zweier single chains. For the sake of clarity the origin of the unit cell of kanemite has been shifted to [0 −¼ 0].
Journal Article

HYDROTHERMAL STABILITY OF LAYERED SILICATES IN NEUTRAL AND ACIDIC MEDIA: EFFECT ON ENGINEERED-BARRIER SAFETY

María D. Alba, Miguel A. Castro, Pablo Chain, M. Mar Orta, M. Carolina Pazos, Esperanza Pavón
Published: 01 August 2010
Clays and Clay Minerals (2010) 58 (4): 501–514.
DOI: https://doi.org/10.1346/CCMN.2010.0580405
... of their different characteristics associated with these properties. Kanemite (1:0 phyllosilicate), kaolinite (1:1 phyllosilicate), and pyrophyllite and talc (2:1 phyllosilicates with no-layer charge) were examined in order to determine the effect of layer structure, whereas the hydrothermal reactivity of silicates...
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23 Na MQ MAS NMR spectra of K01 <span class="search-highlight">kanemite</span>.

23 Na MQ MAS NMR spectra of K01 kanemite.

Published: 01 May 2013
Figure 8 23 Na MQ MAS NMR spectra of K01 kanemite.
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Structure of Na-<span class="search-highlight">kanemite</span> (adapted from Garvie et al. , 1999 ).

Structure of Na-kanemite (adapted from Garvie et al. , 1999 ).

Published: 01 September 2002
F ig . 9. Structure of Na-kanemite (adapted from Garvie et al. , 1999 ).
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IR&#x2F;FT spectra of <span class="search-highlight">kanemite</span>: Si&#x2F;Na = 1 ( left ) and Si&#x2F;(Na+NH 4 ) = 1 ( right...

IR/FT spectra of kanemite: Si/Na = 1 ( left ) and Si/(Na+NH 4 ) = 1 ( right...

Published: 01 May 2013
Figure 6 IR/FT spectra of kanemite: Si/Na = 1 ( left ) and Si/(Na+NH 4 ) = 1 ( right ).
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Folded 6 3 sheets of u–d tetrahedra in ( a ) sanbornite and <span class="search-highlight">kanemite</span> a...

Folded 6 3 sheets of u–d tetrahedra in ( a ) sanbornite and kanemite a...

Published: 01 February 2019
Fig. 12. Folded 6 3 sheets of u–d tetrahedra in ( a ) sanbornite and kanemite and ( b ) makatite ; cross-sections of each sheet show the folding in one direction, and the u–d symbols indicate the different u–d arrangements in each type of sheet.
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19 F(SP) MAS NMR spectra of <span class="search-highlight">kanemite</span>: ( a ) Si&#x2F;Na = 1 and ( b ) Si&#x2F;(Na+NH 4...

19 F(SP) MAS NMR spectra of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4...

Published: 01 May 2013
Figure 7 19 F(SP) MAS NMR spectra of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4 ) = 1. * = spinning side bands.
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Comparison between the powder XRD patterns of <span class="search-highlight">kanemite</span> starting material an...

Comparison between the powder XRD patterns of kanemite starting material an...

Published: 01 February 2015
F ig . 1. Comparison between the powder XRD patterns of kanemite starting material annealed ex situ at five different temperatures. Characteristic peaks of the monohydrate (NaSi 2 O 4 (OH)·H 2 O, 60°C) and NaSi 2 O 4 (OH) (150°C) are indicated by arrows.
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Projections of a single silicate layer in ( a ) <span class="search-highlight">kanemite</span>, ( b ) NaSi 2 O 4 ...

Projections of a single silicate layer in ( a ) kanemite, ( b ) NaSi 2 O 4 ...

Published: 01 February 2015
F ig . 4. Projections of a single silicate layer in ( a ) kanemite, ( b ) NaSi 2 O 4 (OH)·H 2 O and ( c ) NaSi 2 O 4 (OH) parallel to the normal of the sheet in a topological description showing the connectivities of the Si atoms.
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Powder XRD pattern of synthetic (a) H-magadiite, (b) Na-magadiite, (c) Ca-m...

Powder XRD pattern of synthetic (a) H-magadiite, (b) Na-magadiite, (c) Ca-m...

Published: 01 September 2002
F ig . 1. Powder XRD pattern of synthetic (a) H-magadiite, (b) Na-magadiite, (c) Ca-magadiite, (d) Na-kanemite, and (e) Na-kenyaite.
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1 H (SP) MAS NMR spectra of <span class="search-highlight">kanemite</span>: ( a ) Si&#x2F;Na = 1 and ( b ) Si&#x2F;(Na+NH 4...

1 H (SP) MAS NMR spectra of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4...

Published: 01 May 2013
Figure 5 1 H (SP) MAS NMR spectra of kanemite: ( a ) Si/Na = 1 and ( b ) Si/(Na+NH 4 ) = 1. ( c ) Relation between proportions of proton involved in hydrogen bonds and proton from water as function of synthesis medium and mineralizing agent.
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The structure of the layered sodium silicate <span class="search-highlight">kanemite</span> consisting of monolay...

The structure of the layered sodium silicate kanemite consisting of monolay...

Published: 01 June 2012
Fig. 2 The structure of the layered sodium silicate kanemite consisting of monolayers with terminal silanol/siloxy groups and bands of [Na(H 2 O) 6 ] + octahedra interconnected via common edges, Si (small spheres), O (large spheres), Na(H 2 O) 6 (tabezoids), the terminal O atoms represent OH
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Waterfall plot of the sequence of temperature-dependent powder XRD patterns...

Waterfall plot of the sequence of temperature-dependent powder XRD patterns...

Published: 01 February 2015
F ig . 2. Waterfall plot of the sequence of temperature-dependent powder XRD patterns of kanemite collected in situ in the range 25–250°C in steps of Δ T = 5°C.