Vibrational spectroscopy and electron-phonon interactions in microwave-hydrothermal synthesized Ba(Mn1/3Nb2/3)O3 complex perovskites.
Ba(Mn1/3Nb2/3)O3 ceramics were synthesized by the microwave-hydrothermal process. Crystalline, single-phase, needle-like materials were obtained with high anisotropy and aspect ratio. Large crystals could be prepared from a direct combination of nanosized crystals under microwaves through an oriented attachment mechanism. Infrared and Raman spectroscopies showed perfect agreement with group-theoretical approaches for a trigonal, P3m1 structure. Franck-Condon modes were identified in Raman scattering experiments conducted in different wavelengths, laser powers, and temperatures. The results showed that the Mn ions exhibit a particular role in the lattice dynamics in complex perovskites.
Dias
Anderson
A
Departamento de Química, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, ICEB II, Sala 67, Ouro Preto-MG, 35400-000, Brazil. anderson_dias@iceb.ufop.br
Matinaga
Franklin M
FM
Moreira
Roberto L
RL
D001464:Barium / Q000737:chemistry*; D004583:Electrons; D008345:Manganese / Q000737:chemistry*; D008872:Microwaves; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000138:chemical synthesis* / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000379:methods; D013696:Temperature; D014732:Vibration
D010087:Oxides; D009556:Niobium; D001464:Barium; D008345:Manganese