The Evolution of Microstructure and Magnetic Properties of the Bismuth Layer Compounds with Cobalt Ions Substitution

Weipeng Wang; Xi Shen; Wei Wang; Xiangxiang Guan; Yuan Yao; Yanguo Wang; Richeng Yu

doi:10.1021/acs.inorgchem.6b02347

The Evolution of Microstructure and Magnetic Properties of the Bismuth Layer Compounds with Cobalt Ions Substitution

Inorg Chem. 2017 Mar 20;56(6):3207-3213. doi: 10.1021/acs.inorgchem.6b02347. Epub 2017 Mar 1.

Authors

Weipeng Wang^{1

2}, Xi Shen¹, Wei Wang^{1

2}, Xiangxiang Guan^{1

2}, Yuan Yao¹, Yanguo Wang¹, Richeng Yu^{1

2}

Affiliations

¹ Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, P. R. China.
² School of Physical Sciences, University of Chinese Academy of Sciences , Beijing 100049, P. R. China.

PMID: 28248109
DOI: 10.1021/acs.inorgchem.6b02347

Abstract

One of the core issues for the A/B site doping in the bismuth layer magnetoelectric materials is to find out the evolution of the magnetic structure, crystal structure and elemental distribution, and the coupling effects between spin and lattice with the increase of ion substitution. Here, we have conducted systematic structural and physical property studies on the series samples of Bi₅Ti₃Fe_1-xCo_xO₁₅. This work presents that Bi₅Ti₃Fe_1-xCo_xO₁₅ forms a single four layer perovskite-like structure for 0 ≤ x < 0.67, while a three layer perovskite-like structure block begins to arise for x ≥ 0.67. With different cobalt content, the sample demonstrates antiferromagnetism, spin state determined magnetism, or magnetic anisotropy determined magnetism. The weak ferromagnetism is considered to be induced by the larger displacement of Co³⁺ ions from the center of octahedra and the change of the spin state of Co³⁺ ions. It is also observed that Fe and Co elements are homogeneously substituted in the three layer structure block, accompanied by the rotation (and/or distortion) of BO₆ octahedra.