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The hitherto unreported compound NH 4 CrF 4  could be prepared by applying hydrothermal high pressure techniques. X-ray powder data show NH 4 CrF 4  to crystallize tetragonally with a = 743.2, c = 650.4 pm, similar to CsFeF 4  and other TIAIF 4 -related structures. The magnetic behaviour was studied below room temperature and proved NH 4 CrF 4  to become antiferromagnetic (TN = 34 K ) within the range known from other A I CrF 4  compounds. The thermolysis of NH 4 CrF 4 , as investigated by X-rays and TG/DTA, begins at about 400 °C and yields CrF 3  and also Cr 2 F 5 , if extended to 1000 °C

Zur Kenntnis von Ammoniumchrom(III)-fluorid NH 4 CrF 4 / On Ammonium Chromium (III) Fluoride NH 4 CrF 4