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Revised crystal data for magnesium dichloride, MgCl 2
Author(s) -
Dorrepaal J.
Publication year - 1984
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889884011997
Subject(s) - diffractometer , monochromator , diffraction , analytical chemistry (journal) , powder diffractometer , magnesium , graphite , powder diffraction , materials science , crystallography , crystal (programming language) , chemistry , wavelength , crystal structure , optics , physics , metallurgy , programming language , optoelectronics , chromatography , computer science
A refinement of the cell parameters of MgCl 2 has been achieved by powder X‐ray diffraction. The diffraction pattern was obtained using a standard PW‐1050 Philips diffractometer operating in the step‐scan mode and equipped with a graphite monochromator and a Xe‐filled proportional counter. Cu radiation with a wavelength of 1.54056 Å was used. The specimen was placed in an air‐tight sample holder in an N 2 atmosphere. An emission spectrographic analysis revealed a purity of > 99%, while the XRD pattern showed that only a small amount of Mg(OH)Cl was present. Unit‐cell dimensions of a = 3.640(4) and c = 17.673(15) Å have been found with V = 234.2(7), Z = 3, D x = 2.339 Mg m −3 . These values are different from those found by Ferrari, Braibanti & Bigliardi [ Acta Cryst. (1963). 16 , 846] using a photographic method. The difference is probably due to the higher accuracy obtained for the present data with the diffractometer.