20 citations · 20 across the 1 of their papers we have counts for
5 papers
Low-temperature Raman spectra of L-histidine crystal
G. P. De Sousa, P. T. C. Freire, J. Mendes Filho +2
We present a Raman spectroscopy investigation of the vibrational properties of L-histidine crystals at low temperatures. The temperature dependence of the spectra show discontinuit…
A Raman Study of Morphotropic Phase Boundary in PbZr1-xTixO3 at low temperatures
K. C. V. Lima, A. G. Souza, A. P. Ayala +5
Raman spectra of PbZr1-xTixO3 ceramics with titanium concentration varying between 0.40 and 0.60 were measured at 7 K. By observing the concentration-frequency dependence of vibrat…
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…
Concentration-Pressure phase diagram for rich Zr PZT ceramics
A. G. Souza Filho, P. T. C. Freire, A. P. Ayala +6
This work reports on the systematic high pressure Raman studies in the PbZrTiO () ceramics performed at room temperature. The pressure depend…
The monoclinic phase of PZT ceramics: Raman and phenomenological theory studies
A. G. Souza Filho, K. C. V. Lima, A. P. Ayala +5
This work reports on the first Raman detection of the tetragonal to monoclinic phase transition in PZT ceramics near morphotropic phase boundary at low temperatures. The transition…