Phase-pure eutectic CoFe2O4-Ba1-xSrxTiO3 composites prepared by floating zone melting

被引:6
作者
Breitenbach, Martin [1 ]
Ebbinghaus, Stefan G. [1 ]
机构
[1] Martin Luther Univ Halle Wittenberg, Inst Chem, Kurt Mothes Str 2, D-06120 Halle, Germany
关键词
Eutectics; Floating zone technique; Composites; Magnetoelectric materials; Magnetic materials; MAGNETIC-PROPERTIES; MAGNETOELECTRIC BEHAVIOR; NANOPARTICLES; COFE2O4; COMBUSTION; NIFE2O4; OXIDE; SIZE;
D O I
10.1016/j.jcrysgro.2017.11.003
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Composites consisting of ferrimagnetic CoFe2O4 and ferroelectric Ba1-xSrxTiO3 were grown by the floating zone technique. The influence of Sr substitution, growth rate and atmosphere during the floating zone process were investigated. The formation of the non-ferroelectric, hexagonal modification of BaTiO3 was avoided by a slight Sr substitution of 3 mol% and the formation of BaFe12O19 was suppressed using pure nitrogen as atmosphere during the floating zone melting. These synthesis parameters led to phase-pure, but electrically conductive CoFe2O4-Ba1-xSrxTiO3 composites. A thermal treatment at 973 K in air resulted in a strong increase of the electric resistivity accompanied by a decrease of the unit-cell parameters of both components indicating the healing of oxygen defects. SEM investigations revealed a variety of different geometric structures and crack-free interfaces between both phases. The low porosities observed in the micrographs correspond with densities above 90%. Magnetoelectric (ME) measurements confirmed a coupling between the ferroic orders of both phases with a hysteresis and maximum alpha(ME) of 1.3 mV Oe(-1) cm(-1). (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:81 / 88
页数:8
相关论文
共 40 条
  • [1] ASTROV DN, 1961, SOV PHYS JETP-USSR, V13, P729
  • [2] Magnetoelectric Interactions in Lead-Based and Lead-Free Composites
    Bichurin, Mirza
    Petrov, Vladimir
    Zakharov, Anatoly
    Kovalenko, Denis
    Yang, Su Chul
    Maurya, Deepam
    Bedekar, Vishwas
    Priya, Shashank
    [J]. MATERIALS, 2011, 4 (04) : 651 - 702
  • [3] Synthesis of nickel ferrite nanoparticles by sol-gel method
    Chen, DH
    He, XR
    [J]. MATERIALS RESEARCH BULLETIN, 2001, 36 (7-8) : 1369 - 1377
  • [4] Directional solidification and interface structure of BaTiO3-CoFe2O4 eutectic
    Echigoya, J
    Hayashi, S
    Obi, Y
    [J]. JOURNAL OF MATERIALS SCIENCE, 2000, 35 (22) : 5587 - 5591
  • [5] Multiferroic and magnetoelectric materials
    Eerenstein, W.
    Mathur, N. D.
    Scott, J. F.
    [J]. NATURE, 2006, 442 (7104) : 759 - 765
  • [6] Finite size effects on the structural and magnetic properties of sol-gel synthesized NiFe2O4 powders
    George, M
    John, AM
    Nair, SS
    Joy, PA
    Anantharaman, MR
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2006, 302 (01) : 190 - 195
  • [7] Ferroelectric ceramics: History and technology
    Haertling, GH
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1999, 82 (04) : 797 - 818
  • [8] A synthesis concept for a nanostructured CoFe2O4/BaTiO3 composite: Towards multiferroics
    Haffer, Stefanie
    Lueder, Christian
    Walther, Till
    Koeferstein, Roberto
    Ebbinghaus, Stefan G.
    Tiemann, Michael
    [J]. MICROPOROUS AND MESOPOROUS MATERIALS, 2014, 196 : 300 - 304
  • [9] Nanostructure-Related Magnetic Properties of Various Mesoporous Cobalt Oxide and Cobalt Ferrite Spinel Phases
    Haffer, Stefanie
    Walther, Till
    Koeferstein, Roberto
    Ebbinghaus, Stefan G.
    Tiemann, Michael
    [J]. JOURNAL OF PHYSICAL CHEMISTRY C, 2013, 117 (46) : 24471 - 24478
  • [10] Room temperature magnetoelectric coupling in single crystal Bi2Fe4O9 nanotubes grown within an anodic aluminum oxide template
    Hajra, P.
    Maiti, R. P.
    Chakravorty, D.
    [J]. MATERIALS LETTERS, 2012, 81 : 138 - 141