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Synthetic strelkinite Na[(UO 2 )(VO 4 )] ·  n H 2 O ( n  = 0, 1, 2) was systematically investigated by single crystal X-ray diffraction and thermoanalytical methods. The anhydrous form and two hydrates were isolated as single crystals and the structures of these phases solved: Na[(UO 2 )(VO 4 )], monoclinic, P2 1 / c ,  a  = 6.0205(1) Å,  b  = 8.3365(1) Å,  c  = 10.4164(2) Å,  β  = 100.466(2)°,  V  = 514.10(1) Å 3 ,  R  1  = 0.0337; Na[(UO 2 )(VO 4 )] · H 2 O, monoclinic, P2 1 / c ,  a  = 7.722(2) Å,  b  = 8.512(1) Å,  c  = 10.480(4) Å,  β  = 113.18(3)°,  V  = 633.3(3) Å 3 ,  R  1  = 0.1658; Na[(UO 2 )(VO 4 )] · 2 H 2 O, monoclinic, P2 1 / n ,  a  = 16.2399(5) Å,  b  = 8.2844(2) Å,  c  = 10.5011(2) Å,  β  = 97.644(2)°,  V  = 1400.24(6) Å 3 ,  R  1  = 0.0776. A possible mechanism of the structural transformation processes during dehydration is proposed based on the structures of the anhydrous phase and the hydrates.

A Detailed Study of the Dehydration Process in Synthetic Strelkinite, Na[(UO 2 )(VO 4 )] · n H 2 O ( n = 0, 1, 2)