X-ray powder diffraction data and unit cells of ammonium paratungstate tetrahydrate
article
X-Ray powder diffraction data and unit cell parameters of industrially produced, as well as bench scale prepared, ammonium paratungstate tetrahydrate are reported and compared with current Powder Data file (PDF) (1989) patterns. A least-squares refinement resulted in two slightly different unit cells. Both ceils are monoclinic with S.G. = P21/n(14), Z = 2. The density, 4.639(2)kg/m3, calculated from one of these unit cells corresponds reasonably well with a measured value of 4.61 (2). it has, however, not been possible to determine at present why ammonium paratungstate tetrahydrate has two unit cells. No relation between the crystalline form and the method of preparation nor the exact water content could be established.
TNO Identifier
270855
Source
Powder Diffraction, 5(3), pp. 167-169.
Collation
3 p.
Pages
167-169
Files
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