Structural and magnetic properties of Mn3-xCdxTeO6 (x=0, 1, 1.5 and 2)

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

Ivanov, S. A.^1,2  Mathieu, R.¹  Nordblad, P.¹  Politova, E.²  Tellgren, R.³  Ritter, C.⁴  Proidakova, V.² 

[1] Uppsala Univ, Dept Engn Sci, SE-75121 Uppsala, Sweden

[2] Karpov Inst Phys Chem, Dept Inorgan Mat, Moscow 105064, Russia

[3] Uppsala Univ, Dept Chem Mat, SE-75121 Uppsala, Sweden

[4] Inst Laue Langevin, Grenoble, France

关键词: Oxides;    Magnetism;    Tellurates;    Magnetic structures;    Neutron diffraction;    Multiferroics;   

DOI  :  10.1016/j.jmmm.2011.12.027

来源: Elsevier

【 摘 要 】

Mn3TeO6 exhibits a corundum-related A(3)TeO(6) structure and a complex magnetic structure involving two magnetic orbits for the Mn atoms [Ivanov et al., 2011 [3]]. Mn3-xCdxTeO6 (x = 0, 1, 1.5, and 2) ceramics were synthesized by solid state reaction and investigated using X-ray powder diffraction, electron microscopy, and calorimetric and magnetic measurements. Cd2+ replaces Mn2+ cations without greatly affecting the structure of the compound. The Mn and Cd cations were found to be randomly distributed over the A-site. Magnetization measurements indicated that the samples order antiferromagnetically at low temperature with a transition temperature that decreases with increasing Cd doping. The nuclear and magnetic structure of one specially prepared Cd-114 containing sample: Mn-1.5 (Cd1.5TeO6)-Cd-114, was studied using neutron powder diffraction over the temperature range 2-295 K. Mn-1.5 (Cd1.5TeO6)-Cd-114 was found to order in an incommensurate helical magnetic structure, very similar to that of Mn3TeO6 [Ivanov et al., 2011 [3]]. However, with a lower transition temperature and the extension of the ordered structure confined to order 240(10) angstrom. (C) 2011 Elsevier B.V. All rights reserved.

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