Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-27T06:38:19.201Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Lau, H. Y., “The Magnetic Properties of NICO3 and VF2 ,” Ph.D. Dissertation, Department of Chemistry, University of Chicago, 1967.Google Scholar
Stout, J. W. and Boo, W. O. J., “Magnetic Ordering in VF2 ,” J. Appl. Phys. 37, 966(1966).Google Scholar
Barrett, C. S., “X-Ray Diffraction Studies at Low Temperatures,” Advances In X-Ray Analysis 5, 33 (1953).Google Scholar
Siegbahn, M., Spectroscopie der Rontgenstrahlen, 2nd Ed., Springer, Berlin (1931).Google Scholar
Bond, W. L., “Precision Lattice Constant Determination,” Acta Cryst. 13, 814(1960).Google Scholar