91 citations · 91 across the 3 of their papers we have counts for
3 papers
Fossilization in Geopark Araripe studied through X-ray diffraction, scanning microscopy and thermogravimetric analysis
Ricardo J. C. Lima, Paulo T. C. Freire, Zélia S. Macedo +2
The Geopark Araripe, located in Northeastern Brazil, is the first UNESCO Natural Park in the South hemisphere and a world-famous fossil deposit of the Early Cretaceous period (appr…
High-pressure Raman study of L-alanine crystal
A. M. R. Teixeira, P. T. C. Freire, A. J. D. Moreno +4
Pressure-dependent Raman scattering studies in the range 0.0 -- 32 kbar were carried out in L-alanine in order to investigate its external mode phonon spectra in relation to the ph…
A Raman Investigation of PbZr0.94Ti0.06O3 Ceramics Under High-Pressures
A. G. Souza Filho, P. T. C. Freire, J. M. Sasaki +5
We have investigated the behavior of the PbZr(0.94}Ti(0.06)O3 Raman spectra as a function of Hydrostatic pressures. The new structural phases were identified based on previous work…