کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1463222 989644 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Giant dielectric constant in Nd2NiO4+δ ceramics obtained by spark plasma sintering
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Giant dielectric constant in Nd2NiO4+δ ceramics obtained by spark plasma sintering
چکیده انگلیسی

The crystal structure and dielectric properties of Nd2NiO4+δ ceramics prepared by spark plasma sintering (SPS) process were characterized. The crystal structure belonged to orthorhombic system with a space group of F mmm, and the excess oxygen content, δ, was about 0.192. Temperature-stable giant dielectric constants (ɛ′ ∼ 105) up to high frequency (5 MHz) over a wide temperature range (200–500 K) were observed in the present ceramics. After comparing the activation energies of dielectric relaxation and electrical conduction, we found the giant dielectric response should be mainly attributed to the adiabatic small polaronic hopping process, while the polaronic hopping process was closely related to the charge ordering in the present ceramics.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 37, Issue 7, September 2011, Pages 2423–2427
نویسندگان
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