Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-29T07:45:05.115Z Has data issue: false hasContentIssue false
  • English
  • Français

Preparationand Properties of Colloidal Particles. Silica on Yttrium Iron Garnet

Published online by Cambridge University Press:  21 February 2011

R.H.M. Godoi ,
M. Jafelicci Jr  and
Joaquim Portillo
R.H.M. Godoi
Affiliation:
São Paulo State University Chemistry Institute, Campus of Araraquara, Brazil
M. Jafelicci Jr
Affiliation:
São Paulo State University Chemistry Institute, Campus of Araraquara, Brazil
Joaquim Portillo
Affiliation:
Seveis Cientifico Tecnics, University of Barcelona, Barcelona, Spain E-mail: [email protected]
Get access

Abstract

Various properties of particles can be altered by coating them with a layer of different chemical composition. Yttrium iron garnet (YIG) particles has been coated with silica for control of their sintering, corrosion resistance, and stabilization of magnetic properties. This silica cover was obtained by hydrolysis of tetraethylorthosilicate (TEOS) in 2-propanol. This material was characterized by transmission (TEM) electron microscopy, (XEDS) X-ray energy-dispersive spectrometry, (XPS) X-ray photoemission spectroscopy and (VSM) vibrating sample magnetometry. YIG was heterocoagulated by silica as indicated by TEM micrographies. XPS measurements indicated that only binding energy for silicon and oxygen was found on the silica shell, which confirms that the YIG was covered. The values of the saturation magnetization differ from the heterocoagulated system to well-crystallized YIG.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 21
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

REFERENCES

01- Philipse, A. P., Bruggen, P. B. Van, Pathmamanoharan, C., Langmuir, 10, 92, 1994.Google Scholar
02- Kihira, H., Ryde, N., Matijevic, E., Colloids and Surfaces,64, 317, 1992.Google Scholar
03- Kihira, H., Ryde, N., Matijevic, E.., J. Chem. Soc. Faraday Trans,88, 2379, 1992.Google Scholar
04- Ryde, N., Matijevic, E., J. Chem. Soc. Faraday Trans,90, 167,1994.Google Scholar
05- Giesche, H., J.Disp. Sci and Technology,19(2&3), 249, 1998 Google Scholar
06- Matijevic, E., Langmuir., 10, 8, 1994.Google Scholar
07- Matijevic, E., Formation ofmonodispersed inorganic particulates;p39–59 in Controlled Particle, dropled and bubble formation, ed Wedlock, D.J., Butterworth-Heinemann Ltd, Oxford 1994.Google Scholar
08- Maroto, J. A, Nieves, F. J., Colloids and Surfaces,145, 271, 1998.Google Scholar
09- Roy, P. R., Roy, K. S., Ganguly, C., Advanced Ceramics; Proceeding of an Internascional Symposium on Advanced Ceramics ISAC'90,Bombay India. Ramini, G, V., Agrawal, D, C., Majumder, S, B., Key Eng. Mater, 56-57, 165, 1991.Google Scholar
10- Matijevic, E., Ohmori, M., J. Colloid Interface Sci. 150,594, 1992.Google Scholar
11- Godoi, R.H.M., Jafelicci, M. Jr, Marques, R.F.C. and Varanda, L.C.. Materials Research Society, Symposium Proceedings 517, 583, 1998.Google Scholar
12- Godoi, R. H. M., Jafelicci, M. Jr, Marques, R. F. C., Varanda, L. C., Lima, R. C.. Quimica Nova, in press, 1999.Google Scholar
13- Matijevic, E., Hsu, W. P. and Wang, G., Colloids and Surfaces,61, 255, 1991.Google Scholar
14- Godoi, R. H. M., Fernandes, L., Jafelicci, M. Junior, Marques, R. C., Varanda, L C., Davolos, M. R.. Journal of Non-Crystalline Solids 247, 141, 1999.Google Scholar
15- Stober, W., Fink, A. and Bohn, E., J.Colloid Interface Sci 26, 62, 1968.Google Scholar
16- Kratohvil, S., Matijevic, E., Adv. Ceramic Mater 2, 798, 1987.Google Scholar
17- Aiken, B., Matijevic, E., J. Colloid Interface Sci,126, 645, 1988.Google Scholar
18- Garg, A., Matijevic, E., Langmuir 4, 38, 1988.Google Scholar
19- Garg, A, Matijevic, E., J. Colloid Interface Sci 126, 243, 1988.Google Scholar
20- Ohmori, M., Matijevic, E., J. Colloid Interface Sci 150, 594, 1992.Google Scholar
21- Chernakova, A., Kostov, K., Shapovalov, V., Nucl. Inst. andMeth. BB62, 228, 1991.Google Scholar
22- Wyk, G. N., Priggemeyer, S., Roos, W. D., Heiland, W., Applied Surface Sci,52, 351, 1991 Google Scholar
23- Vaqueiro, P., et all, J. Mater. Chem. 7(3),501, 1997.Google Scholar
24- Taketomi, S., Kawasaki, K., Osaki, Y., Yuasa, S., J Am. Ceram Soc. 77, 1787, 1994.Google Scholar
25- Ohmori, M. and Matijevic, E., J. Colloid Interface Sci 160, 288, 1993.Google Scholar