کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7886329 | 1509786 | 2018 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Large electrocaloric effect in lead-free Ba1-xCaxTi1-yZryO3 ceramics under strong electric field at room-temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, lead-free Ba1-xCaxZryTi1-yO3 (BCTZ(x, y)) ceramics were prepared by means of the classic solid-state reaction method. The morphotropic phase transition (MPB) from the orthorhombic to the tetragonal phase (O-T) was identified in this composition. Besides, the identification of those two structures at room temperature (RT) was made possible thanks to an X-ray diffraction (XRD) study. In order to determine the phase transitions dielectric measurements were conducted. Based on Maxwell equation, the electrocaloric (EC) effect in the studied ceramics was performed via the indirect method. The compositions gave maximum EC temperature changes (ÎT) at above their TC on application of a 3â¯kV/mm electric field. These temperature changes are ÎTâ¯=â¯0.565â¯K at TEC=â¯392â¯K, ÎTâ¯=â¯0.548â¯K at TEC=â¯365â¯K and ÎTâ¯=â¯0.235â¯K at TEC=â¯307â¯K for BCZT(10%,5%), BCZT(13%,10%) and BCZT(20%,15%), respectively. At RT, these compositions provided a very interesting EC coefficient (ξâ¯=â¯ÎT/ÎE) compared to the pure BaTiO3 (BT). These values, lying between 0.105 Kmm/kV and 0.188Kmm/kV for ÎEâ¯=â¯3â¯kV/mm, are also greater than those related to some lead-based ferroelectric.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 12, 15 August 2018, Pages 13595-13601
Journal: Ceramics International - Volume 44, Issue 12, 15 August 2018, Pages 13595-13601
نویسندگان
Manel ben Abdessalem, Issa Kriaa, Abdelhedi Aydi, Najmeddine Abdelmoula,