Journal
RSC ADVANCES
Volume 5, Issue 50, Pages 39828-39839Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra03691g
Keywords
-
Categories
Funding
- Higher Education Commission of Pakistan under 5000 Indigenous Ph.D fellowship program (Pin) [041211772 P-108]
- project Development and Study of Magnetic Nanostructures
Ask authors/readers for more resources
Structural and Raman analysis confirmed a single phase wurtzite hexagonal crystalline structure of Li co-doped ZnO nanoparticles. In the Raman backscattering spectra, E-2(Low) and E-2(High) modes corresponded to zinc and oxygen lattice vibrations. No extra vibration modes of secondary or metallic phases of Co or Li were observed. The intensity of Raman modes decreased with increasing Li content. High resolution X-ray photoelectron spectroscopy (XPS) of Zn and Co confirmed the +2 oxidation state. The deconvolution of high resolution XPS spectra of Li showed the presence of interstitial and substitutional Li defects. The room temperature polarization lay in the range of 0.155-0.225 mu C cm(-2) for different compositions. We observed an interesting result in the co-doped system, that even the low Li concentration sample, e.g., Zn0.94Co0.04Li0.02O, showed a P-E hysteresis loop of polarization at similar to 0.20 mu C cm (2). There was higher polarization for y = 0.10, due to more interstitial Li defects, and lower polarization for y = 0.06, due to more substitutional Li defects. We suggest that polarization might have appeared and been enhanced due to the net interaction of dipoles, formed by Li off-center impurities (interstitial Li defects).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available