کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7886689 | 1509787 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Defect chemistry and dielectric behavior of Sr0.99Ce0.01Ti1âxO3 ceramics with high permittivity
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Sr0.99Ce0.01Ti1-xO3 (SCT, xâ¯=â¯0, ±â¯0.0025, ±â¯0.0050, 0.0075) ceramics were prepared by solid state reaction methods and sintered in air atmosphere at different temperatures, with a soaking time of 2â¯h. The dielectric properties of all samples presented excellent temperature independence over a broad temperature range from 25 to 330â¯â and frequency independence between 10â¯kHz and 1â¯MHz. Sr0.99Ce0.01Ti0.9925O3 (SCT0.9925) ceramics sintered in air atmosphere exhibited a high permittivity (~5400) and a low dielectric loss (~0.01) measured at room temperature and 1â¯kHz. XPS and complex impedance spectroscopy analysis confirmed that the high permittivity and low dielectric loss were attributed to the fully ionized oxygen vacancies and giant defect-dipoles in Ti-deficient samples. However, a higher dielectric loss of Ti-rich samples is owing to the destruction of giant defect dipoles, in which highly localized electrons were transformed into hopping electrons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 11, 1 August 2018, Pages 12065-12072
Journal: Ceramics International - Volume 44, Issue 11, 1 August 2018, Pages 12065-12072
نویسندگان
Xingxing Zhou, Minghe Cao, Zhijian Wang, Yun Rao, Qu Luo, Bo Yang, Hua Hao, Zhonghua Yao, Zhiyong Yu, Hanxing Liu,