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000906371 1001_ $$0P:(DE-HGF)0$$aPandey, Gaurav Chandra$$b0
000906371 245__ $$aStructural Transformations and Magnetic Properties of Mixed Spinel‐Type NiCr$_{1.7}$Fe$_{0.3}$O$_4$ Nanoparticles
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000906371 520__ $$aStructural and magnetic properties of NiCr1.7Fe0.3O4 nanoparticles, synthesized by a facile coprecipitation method, are examined using temperature-dependent X-ray diffraction, neutron scattering with XYZ polarizations, and magnetic measurements. The structural analysis demonstrates the stabilization of the cubic phase down to 200 K, followed by a low-temperature tetragonal phase at 100 K and an orthorhombic phase below 50 K. The refined occupancies of cations demonstrate that the NiCr1.7Fe0.3O4 is a mixed spinel compound, wherein B sites are populated by ≈85% Cr3+ and ≈15% Ni2+ cations and A sites are populated by ≈70% Ni2+ and ≈30% Fe3+ cations. As a consequence, the reduction in the occupancy of Jahn–Teller active Ni2+ (triply degenerate: e4 t4) at A site is attributed to the stabilization of the cubic phase below room temperature. Temperature-dependent magnetization and neutron scattering with XYZ polarizations measurements reveal the ferrimagnetic nature of the magnetic phase and the absence of spin-spiral ordering in NiCr1.7Fe0.3O4 nanoparticles. Furthermore, field-dependent magnetization measurement demonstrates an exchange bias field of ≈134.5 kA m−1 at 5 K. The training effect measurement is performed to discuss the origin of exchange bias based on different phenomenological models such as power-law and multiexponent models.
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000906371 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b1$$ufzj
000906371 7001_ $$0P:(DE-HGF)0$$aRath, Chandana$$b2$$eCorresponding author
000906371 773__ $$0PERI:(DE-600)1481096-7$$a10.1002/pssb.202100284$$gVol. 258, no. 11, p. 2100284 -$$n11$$p2100284 -$$tPhysica status solidi / B$$v258$$x0370-1972$$y2021
000906371 8564_ $$uhttps://juser.fz-juelich.de/record/906371/files/Physica%20Status%20Solidi%20b%20-%202021%20-%20Pandey%20-%20Structural%20Transformations%20and%20Magnetic%20Properties%20of%20Mixed%20Spinel%E2%80%90Type%20NiCr1.pdf
000906371 8564_ $$uhttps://juser.fz-juelich.de/record/906371/files/su_PSS_B%20_2021_Pandey_final_ver.pdf$$yPublished on 2021-08-27. Available in OpenAccess from 2022-08-27.
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