Synthesis and properties of nanocrystalline superparamagnetic gamma-Fe2O3

被引：52

作者：

Vollath, D ^{[1
]}

Szabo, DV ^{[1
]}

Taylor, RD ^{[1
]}

Willis, JO ^{[1
]}

Sickafus, KE ^{[1
]}

机构：

[1] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545

来源：

NANOSTRUCTURED MATERIALS | 1995年 / 6卷 / 5-8期

关键词：

D O I：

10.1016/0965-9773(95)00215-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline maghemite (gamma-Fe2O3) was synthesized in a microwave plasma energized by a 915 MHz generator Precursor for this synthesis is water free FeCl3. The resulting particles were in the size range from 4 to 5 nm. Magnetic measurements revealed that the material synthesized by the microwave plasma route is superparamagnetic. At a temperature of 300 K and a magnetic field of I T the magnetization of this material was 2.7 Am-2/kg. Ar 10 K this value increased to 4.3 Am-2/kg. Additionally, measurements of the Mossbauer effect were performed. As expected, these measurements showed a pure quadrupole splitting at room temperature and two predominantly magnetic sites at 4 K. The blocking temperature is around 80 K.

引用

页码：941 / 944

页数：4

共 8 条

[1]

Birringer R., 1986, T JAPAN I METALS S, V2, P43

[2] Magnetism of ultrafine particles [J].

Gangopadhyay, S. ;

Hadjipanayis, G.C. ;

Dale, B. ;

Sorensen, C.M. ;

Klabunde, K.J. .

Nanostructured Materials, 1992, 1 (01)

[3]

GREENWOOD NN, 1971, MOSSBAUER SPECTROSCO, P241

[4] INVESTIGATION OF NANOCRYSTALLINE IRON MATERIALS BY MOSSBAUER-SPECTROSCOPY [J].

HERR, U ;

JING, J ;

BIRRINGER, R ;

GONSER, U ;

GLEITER, H .

APPLIED PHYSICS LETTERS, 1987, 50 (08) :472-474

[5] MOSSBAUER STUDIES OF THERMAL EXCITATIONS IN MAGNETICALLY ORDERED MICROCRYSTALS [J].

MORUP, S ;

TOPSOE, H .

APPLIED PHYSICS, 1976, 11 (01) :63-66

[6]

Shull R. D., 1992, Nanostructured Materials, V1, P83, DOI 10.1016/0965-9773(92)90057-5

[7]

Vollath D., 1992, Nanostructured Materials, V1, P427, DOI 10.1016/0965-9773(92)90093-D

[8]

Vollath D., 1993, Nanostructured Materials, V2, P451, DOI 10.1016/0965-9773(93)90161-4

← 1 →