کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1527945 1511864 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric relaxation of BaTiO3 (BTO)–CaCu3Ti4O12 (CCTO) composite screen-printed thick films at low temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Dielectric relaxation of BaTiO3 (BTO)–CaCu3Ti4O12 (CCTO) composite screen-printed thick films at low temperatures
چکیده انگلیسی

In this work, we report electrical measurements of CaCu3Ti4O12 (CCTO) and (BaTiO3–barium titanate, BTO) thick films. The dielectric constant (K) measurements shows that the BTO thick film present a higher K compared to CCTO compound, in the range of frequencies under study. However, for the composite film (CCTO50 and CCTO50T films), one has an unexpected result; the dielectric constant is higher for all the frequencies under study. The BTO–CCTO composite films do not obey the empirical mixing rule.These electric properties were also studied in the temperature range of 80–300 K. For the CCTO film, two relaxation processes were detected. The calculated activation energy was around 0.51 eV for temperatures above 200 K. One second relaxation process was observed on cooling below 200 K with activation energy around 0.061 eV. For the composite film CCTO50T, both relaxation processes are still present.Therefore, these measurements confirm the potential use of such materials for small high dielectric planar devices. These films are also attractive for capacitor applications and certainly for microelectronics, microwave devices (cell mobile phones, for example), where the miniaturization of the devices is crucial.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 96, Issues 2–3, 10 April 2006, Pages 402–408
نویسندگان
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