The Crystal Structure of Hf(OH)2SO4.

Ab initiostructure determination of Zr(OH)2SO4.3H2O using the conventional monochromatic X-ray powder diffraction

“…These results, combined with the corresponding O-O distances ranging from 2.38 to 2.44A, agree remarkably well with those reported for SOn ions in a series of hydrated salts (Baur, 1964). The regular shape observed in this work probably results from the less important influence of the sulfate group in the zirconium framework in comparison with its r61e in other known hydrated basic zirconium sulfates; for example, the layer structure of Zr(OH)2SO4.H20 (Hansson, 1973a) exhibits somewhat distorted sulfate tetrahedra, probably due to their chain connecting function, to give rise to a twodimensional network. Zr2(OH)2(SOa)3.4H20 (McWhan & Lundgren, 1958) is built up from dimeric units, they behave as bridging ligands linking positive zirconium dimers in a three-dimensional arrangement.…”

Solution‐Processed HafSOx and ZircSOx Inorganic Thin‐Film Dielectrics and Nanolaminates

“…Several structures have been characterized as simple hydrates, e.g., Hf(SO 4 ) 2 · nH 2 O or Zr(SO 4 ) 2 · nH 2 O, [12] exhibiting variations in the degree of hydration and in the structural dimensionality associated with the condensation of the metal atom, sulfate groups, and water. Materials rich in metal relative to sulfate are known, and they include Zr 2 (OH) 2 (SO 4 ) 3 · 4H 2 O; [13] Hf(OH) 2 SO 4 , Zr(OH) 2 SO 4 , and their hydrates; [14][15][16][17][18] [19,20] and Zr 3 O 5 SO 4 and its hydrate. [21] Additional, largely uncharacterized phases have also been reported.…”

The crystal structure of Hf18O10(OH)26(SO4)13(H2O)33

“…The determination of HfI8010(OH)z6(SO4)13(HzO)33 forms part of a systematic investigation of crystalline basic phases appearing in the two systems Zr(Hf)Oz-803-H20 (McWhan & Lundgren, 1966;Hansson, 1969Hansson, , 1973aHansson, Lundgren & McWhan; to be published) and Zr(Hf)Oz-CrO3-H20 (Mark, 1972(Mark, , 1973Hansson & Mark, 1973).…”