Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1

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Marco E. Ciriotti
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Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1

Messaggio da Marco E. Ciriotti » dom 30 lug, 2017 10:26

Prossima pubblicazione.

Referenza:
▪ Mills, S.J., Christy, A.G., Favreau, G., Galea-Clolus, V. (2017): Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1. Acta Crystallographica, B73, (in press).

Synopsis:
This is the first refined example of a cyano­trichite-group mineral in which long-range order of interlayer anions produces a superstructure.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
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Re: Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1

Messaggio da Marco E. Ciriotti » mar 03 ott, 2017 14:26

Pubblicazione avvenuta.

Referenza:
▪ Mills, S.J., Christy, A.G., Favreau, G., Galea-Clolus, V. (2017): Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1. Acta Crystallographica, B73, 950-955.

Abstract:
A new superstructure of the mineral camérolaite, Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4), has been refined in space group P11 with unit-cell parameters aP = 7.7660(16), bP = 8.759(4), cP = 11.306(2) A ˚, alphaP = 108.67 (4), betaP = 83.41(3), gammaP = 126.64(2), V = 581.6(3) A˚3 and Z = 1, with R1 = 0.0951 (all data). This is the first refined example of a cyanotrichite-group mineral in which long-range order of interlayer anions produces a superstructure along b, although diffuse scattering has previously been reported that corresponds to short-range order.
Though the structure shares with other members of the cyanotrichite group a structural unit in which ribbons of edge-sharing Cu and Al octahedra form layers || (001), the superstructure arises from regular alternation of [SO4] and [Sb(OH)6] polyhedra along rods that lie between the layers, and phase coupling between rods that maximizes the distance between [SO4] groups of adjacent rods along a and c directions. This arrangement suggests an alternative nearly orthogonal choice of unit cell in F11 with parameters aF = 12.473 (26), bF = 8.759 (4), cF = 21.476 (7)A ˚ , alphaF = 85.94 (4), betaF = 95.91 (5), gammaF = 92.34 (9), which is recommended for comparing this structural variety of camérolaite with other members of the group.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 23411
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Multidimensional structural variation in the cyano­trichite family of merotypes: camérolaite-3b-F-1

Messaggio da Marco E. Ciriotti » mar 03 ott, 2017 14:36

Eventuali interessati possono richiedere a me copia a uso personale del lavoro: m.ciriotti@tin.it
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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