Crystal structure of a complex basic zirconium sulfate

Abstract

crystals that are strictly isomorphous with those of the same isomer of the tantalum analogue.9 In both cases, the two chelate rings have the same ( ) conformation and the molecule is chiral. The two molecular structures have principal dimensions that do not differ significantly at the 3 level. Thus, there are the following differences (esd's in parentheses): M-M, 0.004 (3) Á; M-P, 0.018 (8) A; M-Clb, 0.009 (9) A; M-C1" 0.000 (10) A. While corresponding Nb and Ta molecules of this class have previously been found to have similar dimensions, as in the comparison of 1 and 2 above, this is apparently the first case in which they have been so similar as to be identical within the 3 criterion.Comparison of 1 and 3. These two structures are surprisingly similar in view of the difference between dene and depe as ligands.The two Nb-Nb distances are different in a statistically significant sense, viz., 2.741 (3) A in the depe compound (3) and 2.764 (1) A in the dene compound (1), but in a chemical sense the difference (9) Cotton, F.

Structural Analysis of Zirconium Hydroxide Nitrate Monohydrates by X-Ray Powder Diffraction

“…Similar to the variety of zirconium hydroxide sulfates reported in literature (1,2), the related family of hydroxide nitrates exhibits a number of phases, which have been clearly identified from temperature-dependent X-ray powder diffraction (TDXD) (3). These phases are generally obtained in a powder form and the application of the developments occurred in the past 10 years in ab initio structure determination (see, for example, Ref.…”

“…Pure CuK radiation ( "1.540598 A s ) was produced with an incident beam curved-crystal germanium monochromator with asymmetric focusing (8). The alignment of the instrument was checked by means of the 00l diffraction lines of fluorophlogopite mica standard material (NIST SRM 675); the error on the zero point was estimated less than 0.01° (2 ). Powder specimens of the and forms were mounted in a top-loaded sample holder and data were collected at 20 and 24°C, respectively.…”

“…Powder specimens of the and forms were mounted in a top-loaded sample holder and data were collected at 20 and 24°C, respectively. Slits in the incident beam were adjusted for a complete illumination of the sample at 12° (2 ). No significant preferred orientation of the crystallites was detected from different preparations of the two samples in the sample holder.…”

Oxo‐Anion Modified Oxides

“…Sulfate-bridged complexes of the constitution [Zr n (OH) n+1 (SO 4 , which include water as a ligand [80]. Hence, it is not hydrous zirconia that is precipitated from these solutions but sulfates, and the large number of possible sulfates [61,81,82], particularly basic sulfates [61,83,84,85], suggests that numerous complexes of different constitution may exist in solution. Consistently, no particular species have been reported as being stable over a range of conditions in zirconium sulfate solutions.…”

Dynamic studies of zirconia crystallization

“…It is instructive to review the question of the structural unit. While there are no hard data concerning the hydroxide, structural studies on the oxychloride [15,16,18], crystalline basic sulphates [21,22] and all three phases of the oxide [23-253 reveal striking similarities. In particular, the tetramer in the oxychloride can be seen as being closely related to the fluorite structure of the cubic phase, with the tetragonal and monoclinic forms representing the effects of distortions [26].…”