UNSPECIFIED (1997) Nuclear and magnetic structures of the distorted hexagonal perovskites ND4FeCl3 and NH4FeCl3. In: International Conference on Neutron Scattering, AUG 17-21, 1997, TORONTO, CANADA.

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Abstract

The crystal structure of NH4FeCl3 and ND4FeCl3 is related to hexagonal perovskite: chains of face-sharing FeCl6 octahedra lie parallel to the c-axis, giving quasi-one-dimensional magnetic properties. At high temperatures the nonspherical ion NH4+ or ND4+ is fully disordered, and the structure may be modelled in space group P6(3) with a primitive cell of dimensions a x a x c, Powder neutron diffraction and single crystal X-ray measurements show that on cooling the ammonium group becomes more ordered and the rest of the crystal structure distorts, with phase transitions at 181 and 19.5 K. At 3.5 K the magnetic moments freeze to give long-range magnetic order with ferromagnetic correlation within the chains and an antiferromagnetic array in the frustrated nb plane. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICA B-CONDENSED MATTER
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0921-4526
Date:	December 1997
Volume:	241
Number of Pages:	2
Page Range:	pp. 385-386
Publication Status:	Published
Title of Event:	International Conference on Neutron Scattering
Location of Event:	TORONTO, CANADA
Date(s) of Event:	AUG 17-21, 1997
URI:	http://wrap.warwick.ac.uk/id/eprint/15663

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