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Infrared Reflection of Ba(Mg 1/3 Ta 2/3 )O 3 Ceramics
Author(s) -
Sagala Djuniadi A.,
Koyasu Shigeji
Publication year - 1993
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.1151-2916.1993.tb03963.x
Subject(s) - infrared , octahedron , infrared spectroscopy , reflection (computer programming) , ceramic , rietveld refinement , materials science , trigonal crystal system , dielectric , crystal structure , spectral line , reflectivity , analytical chemistry (journal) , chemistry , mineralogy , optics , crystallography , physics , optoelectronics , metallurgy , astronomy , computer science , programming language , organic chemistry , chromatography
The dielectric function of the ordered Ba(Mg 1/3 Ta 2/3 )O 3 ceramics was investigated by the infrared reflectance spectra taken over the 50–4000‐cm −1 range. The detailed crystal structure of the specimen was examined by the Rietveld method. The space group of trigonal D 3d 3 and the degree of long‐range order of 0.97 for Mg and Ta atomic arrangement were confirmed. The reflectance spectra were analyzed on the basis of the four‐parameter semiquantum model assuming 16 infrared active vibrational modes allowed for the related D 3d 3 structure. The lowest‐frequency optical mode was found at 60 cm −1 , which can be assumed to involve the motions of the heavy TaO 6 octahedra.