| dc.contributor.author | Smrčok, Ľubomír | |
| dc.contributor.author | Ďurovič, Slavomil | |
| dc.contributor.author | Petříček, Václav | |
| dc.contributor.author | Weiss, Zdeněk | |
| dc.date.accessioned | 2007-11-05T07:54:24Z | |
| dc.date.available | 2007-11-05T07:54:24Z | |
| dc.date.issued | 1994 | |
| dc.identifier.citation | Clays and Clay Minerals. 1994, vol. 42, no. 5, p. 544-551. | en |
| dc.identifier.issn | 0009-8604 | |
| dc.identifier.uri | http://hdl.handle.net/10084/64018 | |
| dc.language.iso | en | en |
| dc.publisher | Clay Minerals Society | en |
| dc.relation.ispartofseries | Clays and Clay Minerals | en |
| dc.relation.uri | https://doi.org/10.1346/CCMN.1994.0420505 | en |
| dc.subject | cronstedtite | en |
| dc.subject | order-disorder (OD) | en |
| dc.subject | polytypism | en |
| dc.title | Refinement of the crystal structure of cronstedtite-3T | en |
| dc.type | article | en |
| dc.identifier.location | Ve fondu ÚK | en |
| dc.description.abstract-en | The crystal structure of cronstedtite-3T from Kutnfi Hora (Bohemia, Czechoslovakia), space
group P31, was refined to Rw(all) = 3.1% for 1336 independent diffractions. There are two and three
independent tetrahedral and octahedral positions, respectively, in this structure. The tetrahedra are occupied
by 0.75 Si and 0.25 Fe while the octahedra are uniformly occupied by Fe. The refinement process
was hindered by two problems: a "strong" superposition structure (all atoms of the octahedral sheets,
i.e., + 70% of the total diffraction power contribute almost solely to the family diffractions with mod(h-k,
3) = 0), and a slight disorder of the investigated crystal. The first problem was resolved by a preliminary
block-diagonal refinement procedure where the atoms coinciding in the superposition structure were
separated into individual blocks. The second problem was resolved by including two scale factors into
the final full-matrix refinement: one for family diffractions, the other for the remaining ones which are
characteristic for this polytype. | en |
| dc.identifier.doi | 10.1346/CCMN.1994.0420505 | |
| dc.identifier.wos | A1994PZ18700005 | |