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Crystal Distortions Associated with Magnetic Ordering in the Antiferromagnetic Compound VF2

Published online by Cambridge University Press:  06 March 2019

W. S. McCain ,
D. L. Albright  and
W. O. J. Boo
W. S. McCain
Affiliation:
Illinois Institute of Technology, ChicagoIllinois 60616
D. L. Albright
Affiliation:
Illinois Institute of Technology, ChicagoIllinois 60616
W. O. J. Boo
Affiliation:
University of Mississippi, University, Mississippi
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Abstract

Lattice constants were measured as a function of temperature by single crystal diffracrometry in the temperature range which includes the Néel temperature of VF2(TN= 7°K). The lattice constants of VF2(D4h14=P42m n m) were measured from room temperature down to 4.2°K. In this range rhe tetragonal c-axis contracts 0.58% from 3.2359 Å (RT) to 3.2170 Å (4.2°K). On the other hand, the a-axes show a net expansion of 0.18% from 4.8023 Å (RT) to 4.8110 Å at 4.2°K. The temperature dependence of the lattice constants can be correlated with anisotropy of exchange forces. Vanadium Ions occupy the center and corner positions of the unit cell. Strong magnetic interactions are directed parallel to the c-axis >001< with considerably weaker interactions parallel to the body diagonals >111< The relative strengths of the two exchange integrals are J >001< = 50 J >111<. As a consequence the magnetic ordering is one-dîmensional along the c-axis and the associated distortions arise from the strong magnetic interactions along this axis.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 14: Nineteenth Annual Conference on Applications of X-ray Analysis, August 5-7, 1970 , 1970 , pp. 433 - 440
Copyright
Copyright © International Centre for Diffraction Data 1970

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References

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