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Titolo:
Characterization and size-dependent magnetic properties of Ba3Co2Fe24O41 nanocrystals synthesized through a sol-gel method
Autore:
Xiong, G; Wei, GB; Yang, XJ; Lu, LD; Wang, X;
Indirizzi:
Nanjing Univ Sci & Technol, Mat Chem Lab, Nanjing 210094, Peoples R China Nanjing Univ Sci & Technol Nanjing Peoples R China 210094 eoples R China
Titolo Testata:
JOURNAL OF MATERIALS SCIENCE
fascicolo: 4, volume: 35, anno: 2000,
pagine: 931 - 936
SICI:
0022-2461(200002)35:4<931:CASMPO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
BARIUM FERRITE; PARTICLES; POWDERS; FINE; FERROMAGNETS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, X Nanjing Univ Sci & Technol, Mat Chem Lab, Nanjing 210094, Peoples R China Nanjing Univ Sci & Technol Nanjing Peoples R China 210094 China
Citazione:
G. Xiong et al., "Characterization and size-dependent magnetic properties of Ba3Co2Fe24O41 nanocrystals synthesized through a sol-gel method", J MATER SCI, 35(4), 2000, pp. 931-936

Abstract

Ba3Co2Fe24O41 nanocrystals are synthesized through a stearic acid sol-gel method. The reaction temperatures are dramatically lower than that of the conventional ceramic method. The nanocrystalline powders obtained at 750 degrees C were spherical in shape with grain sizes in the range 15-25 nm and become a plate-like form when the heat-treatment temperature increased. The magnetic properties of these samples are different from those of the bulk Z-type hexagonal ferrite with a lower specific saturation magnetization. This phenomenon can be attributed to the existing of a nonmagnetic layer existing on the surface of the particles. The higher value of the coercivity force is obtained when the particle sizes approximately are equal to 90 nm andassume a single-domain character. The surface composition of the nanocrystalline Co-2-Z hexagonal ferrite is different from that of the bulk counterpart material with a higher content of the Ba element and Co element. (C) 2000 Kluwer Academic Publishers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 19:37:53