...-structure determination for two alkali uranyl dimolybdates, both of which have structural sheets with the composition [(UO 2 )(MoO 4 ) 2 ], but with different sheet-topologies. The structures of K 2 [(UO 2 )(MoO 4 ) 2 ](H 2 O) and Na 2 [(UO 2 )(MoO 4 ) 2 ] contain sheets formed by sharing vertices...

... a): Syntheses and crystal structures of two topologically related modifications of Cs2[(UO2)2(MoO4)3 .. Inorg. Chem . 41 , 34 – 39 . Krivovichev , S.V. , Finch , R. & Burns , P.C. ( 2002 b): Crystal chemistry of uranyl molybdates. V. Topologically distinct uranyl dimolybdate sheets...

... framework uranyl molybdate: synthesis and structure of (NH4)4[(UO2)5 (MoO4)7](H 2 O)5 . Inorg. Chem . 42 , 2459 – 2464 . Krivovichev , S.V. , Finch , R. & Burns , P.C. ( 2002 b): Crystal chemistry of uranyl molybdates. V. Topologically different uranyl dimolybdate sheets...

... [(UO 2 ) 3 O(MoO 4 ) 5 ]: a novel sheet of triuranyl clusters and MoO 4 tetrahedra . Inorg. Chem . 41 , 4108 – 4110 . ——— & ——— ( 2002d ): Crystal chemistry of uranyl molybdates. VII. An iriginite-type sheet of polyhedra in the structure of (UO 2 )Mo 2 O 7 (H 2 O) 2 . Can. Mineral . 40...

... of deloryite contains a uranyl molybdate chain ( Pushcharovsky et al. 1996 ), and both umohoite and iriginite have structures that involve sheets of uranyl and molybdate polyhedra ( Krivovichev & Burns 2000a , b ). The current study demonstrates that other structural themes are possible in uranyl...

... of electroneutral sheets of composition (UO 2 )Mo 2 O 7 (H 2 O) 2 that are parallel to (100) ( Fig. 1a ). The sheets are based upon the iriginite anion-topology ( Fig. 1b ) ( Burns et al. 1996 ) and are topologically identical to the iriginite sheet. F ig . 1. (a) The sheet of uranyl and molybdate...

... the framework. F ig . 1. Polyhedral representations of the structure of Cs 2 [(UO 2 ) 6 (MoO 4 ) 7 (H 2 O) 2 ] (a) projected along [010]. (b) The complex sheet of uranyl and molybdate polyhedra projected along [001]. Uranyl and molybdate polyhedra are shaded with crosses and parallel lines, respectively...

..., for which the connectivity is 2–3–3–2–3. The isostructural compounds Mg[(UO 2 ) 3 (MoO 4 ) 4 ] (H 2 O) 8 and Zn[(UO 2 ) 3 (MoO 4 ) 4 ](H 2 O) 8 contain the uranyl molybdate sheet shown in Figure 6n that is based upon graph L1/2g ( Fig. 6m ). In these structures, the uranyl dimolybdate sheets...

... of composition [(UO 2 )(MoO 4 ) 2 ] 2− that are parallel to the (1̅01) plane. Naϕ 6 octahedra share edges with each other, giving chains parallel to the b axis that link adjacent [(UO 2 )(MoO 4 ) 2 ] 2− sheets into a framework. The four structures are compared to those of related uranyl molybdates. Scattering...

... ] . Inorg. Chem . 41 , 34 – 39 . Krivovichev , S.V. , Finch , R.J. & Burns , P.C. ( 2002b ): Crystal chemistry of uranyl molybdates. V. Topologically distinct uranyl dimolybdate sheets in the structures of Na 2 [(UO 2 )(MoO 4 ) 2 ] and K 2 [(UO 2 ) 3 O(MO 4 ) 2 ](H 2 O) . Can...

... uranyl dimolybdate sheets in the structures of Na 2 [(UO 2 )(MoO 4 ) 2 ] and K 2 [(UO 2 )(MoO 4 ) 2 ](H 2 O) . Can. Mineral . 40 , 193 – 200 . Li , Yaping & Burns , P.C. ( 2000a ): Synthesis and crystal structure of a new Pb uranyl oxide hydrate with a frame-work structure...

.... Topologically distinct uranyl dimolybdate sheets in the structures of Na 2 [(UO 2 )(MoO 4 ) 2 ] and K 2 (UO 2 ) 3 O(Mo 4 ) 2 ](H 2 O) . Canadian Mineralogist 40 , 193 – 200 . Krivovichev, S.V., Cahill, C.L...

... ) Crystal chemistry of uranyl molybdates. V. Topologically distinct uranyl dimolybdate sheets in the structures of Na 2 [(UO 2 )(MoO 4 ) 2 ] and K 2 [(UO 2 )(MoO 4 ) 2 ](H 2 O) . The Canadian Mineralogist , 40 , 193 – 200 . Krivovichev S.V. Filatov S.K. Burns P.C. ( 2002...

... structure of štěpite consists of sheets perpendicular to [001], made up of eight-coordinate uranium atoms and hydroxyarsenate ‘tetrahedra’. The ligands surrounding the uranium atom consist of six oxygen atoms which belong to the hydroxyarsenate groups and two oxygen atoms which belong to interlayer H 2 O...

..., leading to approximately 2-mm-thick sheets of glass after quenching. The melts were equilibrated either in air or under an H 2 –CO 2 –Ar–N 2 atmosphere ( Table 1 ) for 6 hours at 1100°C (NS2 and NS3 compositions), at 1300°C (albite composition), at 1500°C (diopside, basalt and rhyolite compositions...