Author:
van Put John W.,Verkroost Theo W.,Sonneveld Eduard J.
Abstract
AbstractX-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 cells 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.
Publisher
Cambridge University Press (CUP)
Subject
Condensed Matter Physics,Instrumentation,General Materials Science,Radiation
Reference8 articles.
1. Powder Data File (1989). Swarthmore, PA: International Centre for Diffraction Data.
2. Über die Löslichkeit von Wolframsäure und Ammoniumparawolframat in wäßrigem Ammoniak
3. Characterization of various commercial forms of ammonium paratungstate powder
4. van Put J.W. , De Koning P.M. & Van Sandwijk A. (1990). Paper accepted for publication at the 11th Symp. on Ind. Crystall., Garmisch Partenkirchen FRG.
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献