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Abstract <p>The crystal structure and magnetic properties of BiMn<sub>1–<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3</sub> (<i>x</i> ≤ 0.4) solid solutions obtained by solid-phase reactions under high pressure have been studied by neutron and X-ray diffraction and magnetometry methods. The substitution of manganese ions with iron ions is shown to lead to a concentration phase transition from a monoclinic (<i>C</i>2<i>/c</i> space group) to an orthorhombic (<i>Pnma</i> space group) structure; the region of the two-phase structural state corresponds to the concentration range 0.2 ≤ <i>x</i> ≤ 0.4. Solid solutions with chemical compositions corresponding to the morphotropic phase boundary are characterized by the absence of long-range magnetic ordering, while at temperatures below ~80 K spontaneous magnetization is observed, reaching ~10–20 electromagnetic units/g at <i>T</i> = 5 K. The nature of the ferromagnetic component of the magnetic structure in compositions with a two-phase structural state is discussed along with the relationship between the structural state of solid solutions in the region of the morphotropic phase boundary and their magnetic properties.</p>

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Crystal Structure and Magnetic Properties of BiMn1 – xFexO3 (x ≤ 0.4) Solid Solution

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • D. V. Karpinsky,
  • S. I. Latushko,
  • D. V. Zheludkevich,
  • V. V. Sikolenko,
  • M. V. Silibin

摘要

Abstract

The crystal structure and magnetic properties of BiMn1–xFexO3 (x ≤ 0.4) solid solutions obtained by solid-phase reactions under high pressure have been studied by neutron and X-ray diffraction and magnetometry methods. The substitution of manganese ions with iron ions is shown to lead to a concentration phase transition from a monoclinic (C2/c space group) to an orthorhombic (Pnma space group) structure; the region of the two-phase structural state corresponds to the concentration range 0.2 ≤ x ≤ 0.4. Solid solutions with chemical compositions corresponding to the morphotropic phase boundary are characterized by the absence of long-range magnetic ordering, while at temperatures below ~80 K spontaneous magnetization is observed, reaching ~10–20 electromagnetic units/g at T = 5 K. The nature of the ferromagnetic component of the magnetic structure in compositions with a two-phase structural state is discussed along with the relationship between the structural state of solid solutions in the region of the morphotropic phase boundary and their magnetic properties.