Application of principal component analysis and Raman spectroscopy in the analysis of polycrystalline BaTiO3 at high pressure.
The principal component analysis (PCA) was applied to Raman spectra of polycrystalline BaTiO(3) under pressure from atmospheric pressure to approximately 6.72 GPa. For the system utilized, PCA was able to distinguish spectral features and to determine the phase transition pressure: tetragonal to cubic at approximately 2.0 GPa. The present study demonstrates the potentialities of the application of PCA to the investigation on phase transitions at high pressure by Raman spectroscopy.
Sato-Berrú
R Y
RY
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, UNAM, C.P. 04510, México D.F., Mexico. roys_la@yahoo.com
Mejía-Uriarte
E V
EV
Frausto-Reyes
C
C
Villagrán-Muniz
M
M
S
H Murrieta
HM
Saniger
J M
JM
D017609:Barium Compounds / Q000032:analysis*; D003460:Crystallization; D011312:Pressure; D025341:Principal Component Analysis / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014025:Titanium / Q000032:analysis*
D017609:Barium Compounds; C024547:barium titanate(IV); D014025:Titanium