Abstract
A spinel LiMn2O4 is investigated via Raman spectroscopy at 514.5-nm
excitation and X-ray diffraction. The dependence of Raman spectra on the different
irradiated laser powers is determined and found to be different from that at
632.8-nm excitation. Based on our extensive analysis, our experimental results can
be attributed to the laser heating effect, which reduces the Mn4+ cation
concentration in the local area. Consequently, the decrease in average Mn valence in
the local area unavoidably induces the Jahn-Teller effect and local lattice
distortion, which accounts for the evolution of the measured Raman spectra of spinel
LiMn2O4.
© 2012 Chinese Optics Letters
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription