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Non-crystallographic symmetries in the superstructure of (NH4)2ZnCl4

✍ Scribed by doc. dr hab. J. Warczewski

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 359 KB
Volume: 15
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.19800150607

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✦ Synopsis

Abstract

The modulation vector turned out to be equal 1/4. The lattice constants of the orthorhombic superstructure are determined: a = 12.6197(16) Å, b = 7.2107(81) Å, c = 4 × 9.2746(15) Å. The two of the four absences rules are interpreted as corresponding to the non‐crystallographic symmetries:
equation image

The space group P 2~1~cn is determined on the basis of the single crystal X‐ray pictures taking into account the experimental evidence of pyroelectricity in (NH~4~)~2~ZnCl~4~.

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