16 citations · 19 across the 10 of their papers we have counts for
8 papers · 1 filter
Ionic Conductivity Of Solid Oxides Hxag1-xtawo6.NH2O: Microstructural Aspects
Daniel Valim, Antônio G Souza Filho, Josue M Filho +4
A study of impedance spectroscopy was done for the electrical characterization of pyrochlore materials. The experiment consisted of measurements of the dependence of the impedance…
The HLiTaWOHO trirutile structure characterization through Raman and IR spectra comparison: The non-center symmetric case
D. Valim, AG Souza Filho, J M Filho +3
We have performed the LiTaWO vibrational studies for both Raman and infrared actives modes. Although we do not have crystalline samples, the study was conducted qualitatively,…
Chemical doping-induced gap opening and spin polarization in graphene
I. Zanella S. Guerini, S. B. Fagan, J. Mendes Filho +1
By using first principles calculations we report a chemical doping induced gap in graphene. The structural and electronic properties of CrO interacting with graphene layer are…
Raman spectra of L-leucine crystals
P. F. Facanha Filho, P. T. C. Freire, K. C. V. Lima +3
Single crystal samples of L-leucine, C6H13NO2, a fundamental aliphatic amino acid of the human body, have been studied by Raman spectroscopy at temperatures from 300 to 430 K over…
Raman studies of polycrystalline CaCuTiO under high-pressure
D. Valim, A. G. Souza Filho, P. T. C. Freire +5
We report a Raman scattering study of polycrystalline CaCuTiO (CCTO) under pressure up to 5.32 GPa. The pressure dependence of several Raman modes was investigated.…
Low Temperature Phase Transition in Sr(0.66)Ba(0.34)Nb2O6 single Crystal Fibers
J. L. B. Faria, C. W. A. Paschoal, P. T. C. Freire +5
The structural changes in Sr(0.66)Ba(0.34)Nb2O6 single crystal fibers when the temperature decreases from 295 to 10 K is investigated by dielectric constant measurements and Raman…