Mechanosynthesis of nanocrystalline MgFe2O4-neutron diffraction and Mossbauer spectroscopy

被引：7

作者：

Sepelak, V. ^{[1
]}

Bergmann, I. ^{[2
]}

Feldhoff, A. ^{[3
]}

Litterst, F. J. ^{[4
]}

Becker, K. D. ^{[5
]}

Cadogan, J. M. ^{[6
]}

Hofmann, M. ^{[7
]}

Hoelzel, M. ^{[7
]}

Wang, J. L. ^{[8
,9
]}

Avdeev, M. ^{[9
]}

Campbell, S. J. ^{[8
]}

机构：

[1] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

[2] Volkswagen AG, D-38436 Wolfsburg, Germany

[3] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany

[4] Braunschweig Univ Technol, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany

[5] Braunschweig Univ Technol, Inst Phys & Theoret Chem, D-38106 Braunschweig, Germany

[6] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[7] Tech Univ Munich, ZWE, FRM 2, D-85747 Garching, Germany

[8] Univ New S Wales, Australian Def Force Acad, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia

[9] ANSTO, Bragg Inst, Lucas Heights, NSW 2234, Australia

来源：

HYPERFINE INTERACTIONS | 2010年 / 198卷 / 1-3期

关键词：

Neutron diffraction; Mossbauer; Nanocrystalline; MgFe2O4; NONEQUILIBRIUM CATION DISTRIBUTION; STEP MECHANOCHEMICAL ROUTE; CANTED SPIN ARRANGEMENT;

D O I：

10.1007/s10751-010-0243-y

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The evolution of nanocrystalline n-MgFe2O4 by high-energy milling a mixture of MgO and alpha-Fe2O3 for periods of between 0 h and 12 h has been investigated by neutron diffraction in addition to previous Mossbauer, XRD and HRTEM measurements. Complete transformation of the milled products to n-MgFe2O4 only occurs on milling to similar to 8 h even though the average particle size decreases to <similar to 10 nm after milling for 2 h. The applied field Mossbauer spectra of n-MgFe2O4 can be well described by two subspectra representing core and shell regions with different cation distributions and spin canting angles. The neutron pattern of nanocrystalline MgFe2O4 is described well by two components comprising nanoparticles of core and shell dimensions similar to 7(1) nm and similar to 0.7(1) nm, respectively, in support of the Mossbauer core-shell model.

引用

页码：67 / 71

页数：5

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