کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1604942 1516204 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel double-coating approach to prepare fine-grained BaTiO3@La2O3@SiO2 dielectric ceramics for energy storage application
ترجمه فارسی عنوان
یک رویه دوپوششی جدید برای تهیه سرامیک دی الکتریک BaTiO3 @ La2O3 @ SiO2 با دانه ریز برای برنامه ذخیره سازی انرژی
کلمات کلیدی
ساختار هسته پوسته؛ ذرات BaTiO3 @ La2O3 @ SiO2 ؛ سرامیک های با دانه ریز ؛ ذخیره انرژی؛ خواص دی الکتریک درجه حرارت پایدار
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی


• The BaTiO3 particles were coated by La2O3 and SiO2 using a double-coating approach.
• BaTiO3@La2O3@SiO2 particles with a multi-level core-shell structure were obtained.
• Fine-grained BaTiO3@La2O3@SiO2 ceramics met the X8R specification were prepared.
• The prepared ceramics are to be utilized in multi-layer energy storage capacitors.

We prepared submicron BaTiO3@La2O3@SiO2 particles with high uniformity and dispersity using a novel double-coating method. The monodispersed submicron BaTiO3 particles (diameter about 240 nm) formed a ferroelectric core that was coated with La2O3 and SiO2 as a modified layer and a layer with high electrical resistance, respectively, and the thickness of two shells was about 20 nm. We then obtained dense, fine-grained BaTiO3-based energy storage ceramics (grain size ≤ 300 nm) with the same particle structure by means of sintering in air at 1240 °C for 2 h. As the amount of SiO2 increased, the content of the tetragonal phase and the densification first increased and then decreased. When the amount of SiO2 exceeded 9.0 wt%, a secondary phase with Ba2TiSi2O8 appeared, and the core-shell structure disappeared. The BaTiO3@La2O3@SiO2 ceramics met the X8R requirements, with a maximum dielectric constant of 3362 at 6.0 wt% SiO2, and a low dielectric loss at room temperature (< 0.020, with a minimum of 0.011). The remnant polarization deceased from 13.80 to 1.21 μC/cm2, while the energy storage density first increased and then decreased as the amount of SiO2 coating increased from 0.0 to 12.0 wt%. The discharged energy storage density was highest (0.54 J/cm3) for samples containing 9.0 wt% SiO2 under a maximum polarization field of 13.6 kV/mm, and the energy storage efficiency of the ceramic was >85%.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 690, 5 January 2017, Pages 438–445
نویسندگان
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