無水含硫酸ジルコニアの結晶構造

概要

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Zirconium oxide sulfate (ZOS) with high crystallinity was synthesized hydrothermally from a Zr(SO_4)_2 solution. The obtained ZOS had a layer structure and was very thin hexagonal particles. The chemical composition as prepared corresponded to Zr_3O_5SO_4・H_2O and density was 4.12 g/cm^3. ZOS was dehydrated below 600℃ without any change in morphology. The unit cell of anhydrous ZOS was a_0=0.631_1 nm, c_0=1.0250_0 nm and Z =2 if assigned as hexagonal symmetry. Anhydrous ZOS was desulphurized at about 650℃ to metastable cubic ZrO_2 with an orientation relationship (0001)_<ZOS>//(111)_<c->, [1010]_<zos>//[110]_<C-ZrO_2_2>. A reasonable model was proposed for the crystal structure of anhydrous ZOS, in which the center part of a layer was composed of two zirconium planes same as the (111) planes in cubic ZrO_2 with distorted SO^<2->_4 tetrahedrons coordinated at both sides of the layer. The calculated intensities of the diffractions based on the model were in good agreement with those measured by X- ray powder diffractions.
社団法人日本セラミックス協会の論文
1988-10-01