...Sergey V. Krivovichev; Peter C. Burns Abstract Crystals of a new thallium uranyl molybdate, Tl 2 [(UO 2 ) 2 O(MoO 5 )], have been synthesized by high-temperature solid-state reactions. The structure [monoclinic, P 2 1 / n , a 8.2527(3), b 28.5081(12), c 9.1555(4) Å, β 104.122(1)°, V 2088.91(15) Å...

... group P 2 1 / c , a 7.893(2), b 10.907(2), c 13.558(3) Å, β 98.70(3)°, V 1153.8(4) Å 3 , Z = 4. Both structures are based upon sheets of uranyl pentagonal bipyramids and molybdate tetrahedra. The structural sheets in the two compounds are isochemical but topologically distinct. Abstract Nous avons...

...Sergey V. Krivovichev; Peter C. Burns Abstract Two Cs uranyl molybdates, Cs 4 [(UO 2 ) 3 O(MoO 4 ) 2 (MoO 5 )] and Cs 6 [(UO 2 )(MoO 4 ) 4 ], have been synthesized by high-temperature solid-state reactions. The structures of these compounds were solved by direct methods and refined on the basis...

... Association of Canada 2005 uranyl molybdate crystal structure cesium molybdate uranylé structure cristalline césium Both 135 Cs and 99 Mo are long-lived products of radioactive fission. These isotopes are present in significant concentrations in radioactive waste and spent nuclear...

... uranyl molybdate, Ag 10 [(UO 2 ) 8 O 8 (Mo 5 O 20 )], have been synthesized by high-temperature solid-state reaction. The structure [monoclinic, C 2/ c , a 24.672(2), b 23.401(2), c 6.7932(4) Å, β 94.985(2)°, V 3907.3(4) Å 3 , Z = 4] was solved by direct methods and refined to R 1 = 0.049 ( wR 2...

...Sergey V. Krivovichev; Peter C. BURNS Abstract Crystals of four sodium uranyl molybdates, Na 3 Tl 3 [(UO 2 )(MoO 4 ) 4 ] ( 1 ), Na 13− x Tl 3+ x [(UO 2 )(MoO 4 ) 3 ] 4 (H 2 O) 6+ x ( x = 0.1) ( 2 ), Na 3 Tl 5 [(UO 2 )(MoO 4 ) 3 ] 2 (H 2 O) 3 ( 3 ) and Na 2 [(UO 2 )(MoO 4 ) 2 ](H 2 O) 4 ( 4 ), have...

...Sergey V. Krivovichev; Peter C. Burns Abstract A new uranyl molybdate hydrate, [(UO 2 )Mo 2 O 7 (H 2 O) 2 ], has been synthesized by hydrothermal methods. The crystals are dark yellow elongate plates that are invariably twinned on (100). The structure was solved by direct methods and refined...

...Sergey V. Krivovichev; Peter C. Burns Abstract Two Na uranyl molybdates, Na 6 [(UO 2 ) 2 O(MoO 4 ) 4 ] and Na 6 [(UO 2 )(MoO 4 ) 4 ], and one K uranyl molybdate, K 6 [(UO 2 ) 2 O(MoO 4 ) 4 ], have been synthesized by high-temperature solid-state reactions of mixtures of Na 2 CO 3 , K 2 CO 3 , UO 3...

...Sergey V. Krivovichev; Peter C. Burns Abstract Two new uranyl molybdate hydrates, M 2 [(UO 2 ) 6 (MoO 4 ) 7 (H 2 O) 2 ] ( M = Cs, NH 4 ), have been synthesized using hydrothermal methods. The crystals occur as transparent yellow needles and yellow elongate plates for M = Cs and NH 4 , respectively...

... of the structure. 21 05 2000 10 01 2000 © 2000 Mineralogical Association of Canada 2000 The sheets of uranyl and molybdate polyhedra are linked by H bonds involving an interlayer H 2 O group ( Fig. 2 ). The H 2 O(8) group donates two H bonds that are probably accepted by O(7) anions...

.... The structure reportedly contained electrostatically neutral uranyl molybdate sheets linked through H bonds to interlayer H 2 O groups, with the formula [UMoO 6 (H 2 O) 2 ](H 2 O) 2 . The sheets were said to contain uranyl and molybdate hexagonal bipyramids. According to Burns et al. (1996) , the sheets...

...Ting Li; Guang Fan; Xiangkun Ge; Tao Wang; Apeng Yu; Liumin Deng ABSTRACT Tengchongite, a uranyl molybdate mineral from Tengchong County, Yunnan Province, China, was originally described as orthorhombic, with space group A 2 1 22, unit-cell parameters a = 15.616(4) Å, b = 13.043(6) Å, c = 17.716(14...