Structural Transformations and Magnetic Properties of Mixed Spinel-Type NiCr1.7Fe0.3O4 Nanoparticles,Physica Status Solidi (B) - Basic Solid State Physics

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Structural Transformations and Magnetic Properties of Mixed Spinel-Type NiCr1.7Fe0.3O4 Nanoparticles
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-08-27 , DOI: 10.1002/pssb.202100284
G. C. Pandey ₁ , Y. Su ₂ , Chandana Rath ₁

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Structural and magnetic properties of NiCr_1.7Fe_0.3O₄ nanoparticles, synthesized by a facile coprecipitation method, are examined using temperature-dependent X-ray diffraction, neutron scattering with XYZ polarizations, and magnetic measurements. The structural analysis demonstrates the stabilization of the cubic phase down to 200 K, followed by a low-temperature tetragonal phase at 100 K and an orthorhombic phase below 50 K. The refined occupancies of cations demonstrate that the NiCr_1.7Fe_0.3O₄ is a mixed spinel compound, wherein B sites are populated by ≈85% Cr³⁺ and ≈15% Ni²⁺ cations and A sites are populated by ≈70% Ni²⁺ and ≈30% Fe³⁺ cations. As a consequence, the reduction in the occupancy of Jahn–Teller active Ni²⁺ (triply degenerate: e⁴ t⁴) at A site is attributed to the stabilization of the cubic phase below room temperature. Temperature-dependent magnetization and neutron scattering with XYZ polarizations measurements reveal the ferrimagnetic nature of the magnetic phase and the absence of spin-spiral ordering in NiCr_1.7Fe_0.3O₄ nanoparticles. Furthermore, field-dependent magnetization measurement demonstrates an exchange bias field of ≈134.5 kA m⁻¹ at 5 K. The training effect measurement is performed to discuss the origin of exchange bias based on different phenomenological models such as power-law and multiexponent models.

中文翻译：

混合尖晶石型 NiCr1.7Fe0.3O4 纳米颗粒的结构转变和磁性能

NiCr _1.7 Fe _0.3 O ₄纳米粒子的结构和磁性能是通过简单的共沉淀法合成的，使用温度相关的 X 射线衍射、XYZ极化的中子散射和磁测量来检查。结构分析表明立方相稳定到 200 K，然后是 100 K 的低温四方相和低于 50 K 的正交相。精细的阳离子占有率表明 NiCr _1.7 Fe _0.3 O ₄是一种混合尖晶石化合物，其中 B 位点由 ≈85% Cr ³⁺和 ≈15% Ni ²⁺填充阳离子和 A 位点由 ≈70% Ni ²⁺和 ≈30% Fe ³⁺阳离子填充。因此，A 位的Jahn-Teller 活性Ni ²⁺（三重简并：e ⁴ t ⁴）的占有率降低归因于立方相在室温以下的稳定化。具有XYZ极化测量的温度相关磁化强度和中子散射揭示了磁性相的亚铁磁性性质和 NiCr _1.7 Fe _0.3 O ₄纳米颗粒中不存在自旋螺旋有序。此外，场相关磁化测量表明交换偏置场 ≈134.5 kA m^-1 at 5 K。执行训练效果测量以讨论基于不同现象学模型（例如幂律模型和多指数模型）的交换偏差的起源。

更新日期：2021-08-27

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