English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Single crystals of synthetic francoanellite K 3 Al 5 (HPO 4 ) 6 (PO 4 ) 2 -12H 2 O could be obtained for the first time by topochemical dehydration of taranakite crystals. An X-ray structure determination showed francoanellite to be the mineral with the second longest crystallographic axis described hitherto. Crystal data: space group R3c, a = 869.0(2), c = 8227(1)pm, Z = 6 , R g  = 0.042. Francoanellite is a layer structure mineral having six layers of composition [K 3 Al 5 (HPO 4 ) 6 (PO 4 ) 2 (H 2 O) 12 ], connected by hydrogen bonds. The rigid layer is formed by columns of corner sharing hydrogen phosphate tetrahedra and AIO 6 -octahedra which are inter­ connected by additional six-coordinated Al ions. In trigonal holes of the layer orthophosphate ions are situated. The structure of francoanellite is very similar to the structure of taranakite K 3 H 6 Al 5 (PO 4 )  8  · 18H 2 O which has planar water interlayers between the Al-phosphate layers. A neutron scattering experiment with subsequent Rietveld refinement of the powder pattern gave the H-atom positions. Hydrogen bonds in francoanellite are formed within the rigid layers and between them.

zeitschrift für naturforschung b

Francoanellit K 3 Al 5 HPO 4 ) 6 (PO 4 ) 2  · 12H 2 O: Struktur und Synthese durch topochemische Entwässerung von Taranakit / Francoanellite K 3 Al 5 HPO 4 ) 6 (PO 4 ) 2  · 12H 2 O: Structure and Synthesis by Topochemical Dehydration of Taranakite