Signature of lattice defects in far infrared reflectivity of Ba(Mg1/3Ta2/3)O3

Autor:	Taras Kolodiazhnyi, K. Touji, Hsiang Lin Liu, Yuan Tai Tzeng, Chih Ta Chia, Takeshi Shimada
Rok vydání:	2007
Předmět:	Materials science Mineralogy chemistry.chemical_element Sintering Partial pressure Molecular physics Reflectivity Oxygen Spectral line Far infrared chemistry visual_art Lattice defects Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic
Zdroj:	Journal of the European Ceramic Society. 27:2797-2802
ISSN:	0955-2219
DOI:	10.1016/j.jeurceramsoc.2006.11.005
Popis:	Far infrared reflectivity spectra of Ba(Mg1/3,Ta2/3)O3 prepared at several sintering temperatures were measured, and the eigenfrequencies and damping constants of the TO modes were determined. The reflectivity spectra were fitted with the four-parameter semi-quantum model. The variation in the Eu(OII) at 222 cm−1 and A2u(OII) at 238 cm−1 modes in well ordered ceramics was attributed to the variation in the concentration of the B site defects. It was also found that the change in the oxygen partial pressure of the sintering atmosphere causes a change in the seventh (316 cm−1) and eighth (352 cm−1) modes. We attribute these changes to the oxygen site defect although we cannot evaluate the concentration of this defect at this moment. From the behavior of the damping constants it is suggested that the Ba(Mg1/3Ta2/3)O3 (BMT) attains equilibrium defect density at the heat treatment temperature of more than 1630 °C (120 h).
Databáze:	OpenAIRE
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