Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-19T12:35:27.229Z Has data issue: false hasContentIssue false
  • English
  • Français

B-Site Doped Lanthanum Strontium Manganites by the DAAS Technique

Published online by Cambridge University Press:  10 February 2011

S. Yang ,
M.R. Kolody ,
C.-T. Lin ,
P.M. Adams  and
D.M. Speckman
S. Yang
Affiliation:
Department of Chemistry, Northern Illinois University, DeKalb, IL 60115
M.R. Kolody
Affiliation:
Department of Chemistry, Northern Illinois University, DeKalb, IL 60115
C.-T. Lin
Affiliation:
Department of Chemistry, Northern Illinois University, DeKalb, IL 60115
P.M. Adams
Affiliation:
The Aerospace Corporation, P.O. Box 92957, Los Angeles, CA 90009
D.M. Speckman
Affiliation:
The Aerospace Corporation, P.O. Box 92957, Los Angeles, CA 90009
Get access

Abstract

Magnetic perovskites of the general form La0.7Sr0.3Mn1−yFeyO3 (y = 0, 0.05, 0.10, and 0.15) have successfully been synthesized using deposition by aqueous acetate solution (DAAS). Crystalline, iron-doped, lanthanum strontium manganite (Fe-doped LSMO) powders are obtained by preparing an aqueous solution of metal acetate precursors in the proper stoichiometry, drying the solution to generate a glassy gel, consolidating the gel, and then firing the gel for short periods of time (<2hrs). This novel technique has the potential for depositing large area thin films with high throughput and low cost. Powder samples of La0.7Sr0.3Mn1−yFeyO3 prepared by DAAS and annealed for 100 minutes at 1200°C are of high purity, are single phase, and exhibit excellent electrical and magnetic characteristics. Powders annealed at 1200°C or greater exhibit sharp metalinsulator transitions. Increasing the iron dopant concentration in these powders from 0% to 15% decreases the metal-insulator transition temperature of these samples from ∼360K to about 140K. The resistivity of these powders also increases with increasing substitution of the lattice B-site with iron, as does the unit cell volume of the lattice. Preparation of an iron doped LSMO powder that exhibits a maximum magnetoresistance at 305K was successfully carried out via a careful selection of iron content and anneal temperature. This compound, La0.7Sr0.3Mn0.93Fe0.07O3, exhibits a magnetoresistance of 40% at 305K and an applied field of 5 Tesla.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 263
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. Rao, C.N. R., Cheetham, A.K., and Mahesh, R., Chem. Mater. 8, 2421 (1996)Google Scholar
2. Urushibara, A., Moritomo, Y., Arima, T., Asamitsu, A., Kido, G., Tokura, Y., Phys. Rev. B 51, 14103 (1995)Google Scholar
3. Yang, S., Lin, C.T., Rogacki, K., Dabrowski, B.M., Adams, P.M., and Speckman, D.M., Mat. Res. Soc. Symp. Proc. 474, 241 (1997); C.T. Lin, “Production of PT/PZT/PLZT Thin Films, Powders, and Laser ‘Direct Write’ Patterns”, U.S. patent 5,188,902, February 23, 1993; U.S. patent 5,348,775, September 20, 1994Google Scholar
4. Otoshi, S., Sasaki, H., Ohnishi, H., Hase, M., Ishimaru, K., Ippommatsu, M., Higuchi, T., Miyayama, M., and Yanagida, H., J. Electrochem. Soc. 138, 1519 (1991)Google Scholar
5. Zhang, N., Zhong, W., and Ding, W., J. Electron. Mater. 27, 1 (1998)Google Scholar
6. Kim, C.H., Park, S.I., and Bae, S.Y., unpublishedGoogle Scholar