Fine magnetic particles in layered silicates and zeolites

Author

Zhang, L. ; Manthiram, A.

Author_Institution

Center for Mater. Sci. & Eng., Texas Univ., Austin, TX, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3784

Lastpage

3786

Abstract

Ultrafine Ni particles have been generated at ambient temperatures in clay (montmorillonite) and zeolite (mordenite) matrices. The synthesis involves a reduction in aqueous solutions of the ion-exchanged clay or zeolite with sodium borohydride. SQUID magnetometer measurements reveal single domain Ni particles with superparamagnetic properties. While the Ni particles in clay have a narrow distribution of blocking temperatures T_b and particle size, they seem to have in zeolites a broader distribution of T_b and particle size. Time decay measurements of thermoremanent magnetization also support single domain characteristics

Keywords

clay; magnetic domains; magnetic particles; nanostructured materials; nickel; particle size measurement; remanence; superparamagnetism; Ni; SQUID magnetometer measurements; ambient temperatures; aqueous solutions; blocking temperatures; clay; fine magnetic particles; layered silicates; layered zeolites; montmorillonite; mordenite; particle size; single domain Ni particles; sodium borohydride; superparamagnetic properties; thermoremanent magnetization; time decay measurements; ultrafine Ni particles; Amorphous materials; Chemicals; Magnetic particles; Magnetic properties; Magnetization; Materials science and technology; Nanostructured materials; Nickel; Plasma temperature; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489771

Filename

489771