INVESTIGADORES
MASSA Nestor Emilio
artículos
Título:
Infrared and Transport Properties of the Layered Perovskite Related Oxide Ba5Nb4O15 adn its Oxygen Deficient Phases
Autor/es:
SILVINA PAGOLA; NESTOR E. MASSA; GRISELDA POLLA; GABRIELA LEYVA; RAUL E. CARBONIO
Revista:
PHYSICA C - SUPERCONDUTIVITY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 1994 vol. 235 p. 755 - 756
ISSN:
0921-4534
Resumen:
Ba5Nb4O15−x oxides were studied by infrared, electrical resistivity and thermogravimmetric analysis (TGA). FIR reflectivity measurementsreveal a strong ionic compound that has well defined features in groups that we assign to oxygen stretching, bending and lattice phonons splitted by the lower symmetry of this layered compound. For the sample with x = 0.56, oxygen vacancies do not affect phonon band profiles, indicating that carriers are not free enough to interact with longitudinal modes. Electrical resistivity vs. temperature measurements show that the oxygen deficient compounds, for low values of x, are small band gap semiconductors.
