English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The study particularly focuses on the effect of the Cr co-doping on thestructural, optical and magnetic properties of Zn0.99Fe0.01O.Zn0.99-xFe0.01CrxO (x =0, 0.01, 0.03 and 0.05) nanoparticles. Powder x-raydiffraction (XRD) analysis confirms all the samples have hexagonal wurtzitestructures. The average crystallite size (D) and microstrain of the sampleswere calculated using the Williamson-Hall relation and D was found to be 13 +-1 nm for Zn0.99Fe0.01O. In Cr co-doped samples, D increase slightly with Crcontent and are given by 9 +- 1, 10 +- 1, and 11 +- 1 nm for the samples with x= 0.01, 0.03 and 0.05, respectively; while the strain decreased with increasein Cr co-doping. Transmission electron microscopy (TEM) images of the samplesindicate that particles are in the nano-regime and agglomerated. Particle sizesare found to be 14 +- 1, 11 +- 1 and 12 +- 1 nm for Zn0.99-xFe0.01CrxO with x =0, 0.03 and 0.05, respectively. The substitution of Fe3+ and Cr3+ at Zn2+ siteshas an impact on the optical properties. The band-gap decreases from 3.296 +-0.002 eV to 3.258 +- 0.002 eV with increase of Cr concentration.Photoluminescence (PL) of Zn0.96Fe0.01Cr0.03O revealed the presence of defects,the emission peaks at 410 nm and 513 nm are attributed to Zn vacancies (VZn)and singly ionized oxygen vacancies, respectively. The M(-H) curves ofZn0.99-xFe0.01CrxO (x = 0.03 and 0.05) measured at room temperature using avibrating sample magnetometer (VSM) are found to be hysteretic, signifying roomtemperature ferromagnetism (RTFM). Maximum saturation magnetization, 0.67 +-0.01 emu.g-1, is observed in Zn0.94Fe0.01Cr0.05O. The observed RTFM in Fe+Crco-doped ZnO is explained by of bound magnetic polaron (BMP) mechanism, theBMPs are formed by VZn and Vo^+ defects. This paper enhances the understandingof the origin of RTFM in Fe+Cr co-doped ZnO nanoparticles.

Structure, optical and magnetic properties of Fe doped, Fe+Cr co-doped ZnO nanoparticles