Magnetic nanocrystals embedded in silicate glasses studied by polarized SANS

被引：15

作者：

Raghuwanshi, V. S. ^{[1
]}

Harizanova, R. ^{[2
]}

Haas, S. ^{[3
]}

Tatchev, D. ^{[4
]}

Gugov, I. ^{[2
]}

Dewhurst, C. ^{[5
]}

Ruessel, C. ^{[6
]}

Hoell, A. ^{[1
]}

机构：

[1] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[2] Univ Chem Technol & Met, BU-1756 Sofia, Bulgaria

[3] Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden

[4] Bulgarian Acad Sci, Inst Phys Chem, BU-1113 Sofia, Bulgaria

[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[6] Univ Jena, Otto Schott Inst, D-07743 Jena, Germany

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2014年 / 385卷

关键词：

Magnetic nanoparticles; Spherical core-shell; Glass; Polarized small angle neutron scattering (pSANS); SMALL-ANGLE SCATTERING; SYSTEM; MAGNETORESISTANCE; CRYSTALLIZATION; NANOPARTICLES; SIZE; NANOSTRUCTURES; DEPENDENCE; SENSOR; CAF2;

D O I：

10.1016/j.jnoncrysol.2013.10.007

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fe-Mn-O magnetic nanocrystals precipitate in a glass system SiO2/Na2O/Fe2O3/MnO during thermal annealing for different periods of time. We report here small angle neutron scattering investigations using polarized neutrons (pSANS) on these glass samples. Analysis of scattering data reveals the formation of spherical core-shell particles. The core of the particle is found to be magnetic and it is surrounded by a non-magnetic shell-like region. The size parameters of the nanocrystals calculated by pSANS data analyses are comparable with the small angle X-ray scattering (SAXS) investigations, previously reported. Contrary to other glasses in the studied system the diffusion of Fe and Mn ions is not impaired by a rigid shell. This is explained by decreasing of the glass transition temperature of the shell region while its composition departs from that of the matrix. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：24 / 29

页数：6