Nuclear and magnetic structures of the distorted hexagonal perovskites ND4FeCl3 and NH4FeCl3
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.Full text not available from this repository.
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|
|Number of Pages:||2|
|Page Range:||pp. 385-386|
|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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