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Nuclear and magnetic structures of the distorted hexagonal perovskites ND4FeCl3 and NH4FeCl3
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UNSPECIFIED (1997) Nuclear and magnetic structures of the distorted hexagonal perovskites ND4FeCl3 and NH4FeCl3. In: International Conference on Neutron Scattering, TORONTO, CANADA, AUG 17-21, 1997. Published in: PHYSICA B-CONDENSED MATTER, 241 pp. 385-386. ISSN 0921-4526.
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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) | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICA B-CONDENSED MATTER | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0921-4526 | ||||
Official Date: | December 1997 | ||||
Dates: |
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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 |
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