Hostname: page-component-84b7d79bbc-2l2gl Total loading time: 0 Render date: 2024-07-25T14:49:56.053Z Has data issue: false hasContentIssue false
  • English
  • Français

Structure and Magnetism of Nanocrystalline KδMnO2

Published online by Cambridge University Press:  10 February 2011

R.M. Stroud ,
E. Carpenter ,
V.M. Browning ,
J.W. Long ,
K.E. Swider  and
D.R. Rolison
R.M. Stroud
Affiliation:
Naval Research Laboratory, Washington, DC 20375
E. Carpenter
Affiliation:
Naval Research Laboratory, Washington, DC 20375
V.M. Browning
Affiliation:
Naval Research Laboratory, Washington, DC 20375
J.W. Long
Affiliation:
Naval Research Laboratory, Washington, DC 20375
K.E. Swider
Affiliation:
Naval Research Laboratory, Washington, DC 20375
D.R. Rolison
Affiliation:
Naval Research Laboratory, Washington, DC 20375
Get access

Abstract

The structure and magnetic properties of sol-gel-synthesized, nanocrystalline KσMnO2 were investigated. The nanoparticles were determined by x-ray diffraction and high-resolution transmission electron microscopy to be single-crystal rods of the cryptomelane phase of MnO2, with a typical particle size of 6 nm × 20 nm. The field and temperature dependence of the magnetization indicates superparamagnetic behavior, with a blocking temperature of 15K. The dependence of the magnetic properties on particle size, surface layers and mixed valency is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 283
Copyright
Copyright © Materials Research Society 2000

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

1. Chabre, Y. and Pannetier, J., Prog. Solid St. Chem. 23, pp.1–130 (1995).Google Scholar
2. Ananth, M.V., Venkatesan, V., Dakshinamurthi, K., J. of Power Sources 72, pp. 99–102 (1998).Google Scholar
3. Bach, S., Henry, M., Baffïer, N., Livage, J., J. Solid- State Chem. 88, 325–333 (1990).Google Scholar
4. Long, J.W., Swider, K. E., Stroud, R. M., Rolison, D. R., Electrochem. Solid-State Lett., in preparation.Google Scholar
5. Cullity, B. D., Introduction to Magnetic Materials, Addison-Wesley, Reading, MA, 1972, p. 414.Google Scholar
6. Wang, Z. L., Bentley, J., and Evans, N. D., Microscopy and Microanalysis, vol. 5, supplement 2, Proceedings of Microscopy and Microanalysis '99, Portland, OR August 1-5, 1999, (Springer p. 102–103, 1999).Google Scholar