Structural, optical, and magnetic behavior and the nucleation of a Griffiths-like phase in (Ca,V)-doped ZnO nanoparticles

Single-phase (Ca,V) co-doped ZnO nanoparticles (Zn Ca V O, called hereinafter ZCVO) were synthesized a modified sol-gel method. The hexagonal wurtzite symmetry of the ZnO phase nanostructure, belonging to the 6 space group, has been confirmed through X-ray diffraction examinations using Rietveld ref...

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Bibliographic Details
Published in:	Dalton transactions : an international journal of inorganic chemistry Vol. 54; no. 18; p. 7400
Main Authors:	Mrabet, S, Ihzaz, N, Bessadok, M N, Vázquez-Vázquez, C, Alshammari, M, Lemine, O M, Ananias, D, El Mir, L
Format:	Journal Article
Language:	English
Published:	England 06.05.2025
ISSN:	1477-9234, 1477-9234
Online Access:	Get more information
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Summary:	Single-phase (Ca,V) co-doped ZnO nanoparticles (Zn Ca V O, called hereinafter ZCVO) were synthesized a modified sol-gel method. The hexagonal wurtzite symmetry of the ZnO phase nanostructure, belonging to the 6 space group, has been confirmed through X-ray diffraction examinations using Rietveld refinement. No segregated secondary phases or Ca or/and V-rich clusters were detected. The TEM images clearly show the presence of nanoparticles exhibiting a diverse range of spherical shapes. The effect of co-doping on the optical band gap and crystalline quality was also investigated photoluminescence (PL), UV-vis, and Raman spectrometers. The - curve suggests a tenability of magnetic coupling which was discussed within the context of three competing magnetic phases using the 3D spin wave model and Curie-Weiss law. The lack of saturation of the - loop at 10 K suggests the presence of both paramagnetic (PM) and ferromagnetic (FM) phases in ZCVO NPs. The bound magnetic polaron (BMP) model provides a plausible explanation for the observed magnetic phase transition. Moreover, a Griffiths-like phase was observed for the first time, to our knowledge, in co-doped ZnO nanoparticles. This novelty may stem from the interplay between the antiferromagnetic (AFM) and FM interactions of the Ca and V ions, which are acquired by oxygen deficiency.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1477-9234 1477-9234
DOI:	10.1039/d5dt00096c