Back to Search
Start Over
Band Gap Reduction and Improved Ferromagnetic Ordering via Bound Magnetic Polarons in Zn(Al, Ce)O Nanoparticles.
- Source :
- Materials Technology; 2023, Vol. 38 Issue 1, p1-17, 17p
- Publication Year :
- 2023
-
Abstract
- Polycrystalline nanoparticles of Al-doped and Ce-co-doped ZnO were processed through sol)gel co-precipitation. Crystallite sizes determined from XRD were in the range of 10.90 to 48.77 nm. FTIR spectra indicated a stretching mode of Zn-O bond. The insertion of Al and Ce at Zn-O site created Al-O and Ce-O bonds. UV-vis spectra favoured the formation of impurity levels by doping and co-doping. Their overlapping with the conduction band edge led to the reduction of band-gap. Blue-green emission which arises from radiative recombination of a photogenerated hole with an electron occupying oxygen vacancy was observed in photo)luminescence spectra. FESEM suggested granular growth in undoped ZnO which changed to diverse structures such as nano-bar and cluster of elongated grains. Significant improvement in room temperature ferromagnetism (RTFM) was noticed by co-doping of Ce in Al-doped ZnO. Formation of bound magnetic polarons (Ce<superscript>3+</superscript>-V<subscript>o</subscript>-Ce<superscript>3+</superscript>) was the primary mechanism responsible for the improvement in RTFM. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10667857
- Volume :
- 38
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Materials Technology
- Publication Type :
- Academic Journal
- Accession number :
- 162737956
- Full Text :
- https://doi.org/10.1080/10667857.2022.2151114