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Infrared Spectroscopic Investigations in Ordered Barium Magnesium Niobate Ceramics
Author(s) -
Dias Anderson,
Paschoal Carlos William A.,
Moreira Roberto Luiz
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03597.x
Subject(s) - permittivity , ceramic , hydrothermal circulation , materials science , infrared , microwave , infrared spectroscopy , dielectric , barium , trigonal crystal system , electroceramics , relative permittivity , mineralogy , phonon , analytical chemistry (journal) , hydrothermal synthesis , crystal structure , optics , optoelectronics , chemistry , composite material , condensed matter physics , crystallography , metallurgy , fabrication , physics , chemical engineering , alternative medicine , pathology , microfabrication , chromatography , quantum mechanics , medicine , organic chemistry , engineering
Highly ordered Ba(Mg 1/3 Nb 2/3 )O 3 ceramics from hydrothermal powders were investigated for the first time using infrared spectroscopy. The experimental data were analyzed in view of the 16 predicted modes of the trigonal structure and adjusted by a four–parameter semiquantum model. The obtained phonon parameters allowed us to calculate the real part of the dielectric permittivity and losses in all infrared regions, and also to estimate the quality factor ( Q ) for this material in the microwave region. The values obtained for the dielectric permittivity (ɛ′= 19) and Q (12 800 at 10 GHz) showed that hydrothermal Ba(Mg 1/3 Nb 2/3 )O 3 ceramics are good materials for passive components in microwave circuits.