کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1476668 1510147 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Signature of lattice defects in far infrared reflectivity of Ba(Mg1/3Ta2/3)O3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Signature of lattice defects in far infrared reflectivity of Ba(Mg1/3Ta2/3)O3
چکیده انگلیسی

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).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 27, Issues 8–9, 2007, Pages 2797–2802
نویسندگان
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