کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5353434 | 1388163 | 2016 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Terahertz characterization of Y2O3-added AlN ceramics
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Terahertz optical and dielectric properties of AlN ceramics fabricated by hot pressed sintering are investigated by THz time-domain spectroscopy in the frequency range of 0.2-3.5Â THz. The measured properties of the pure AlN ceramic are compared with those of Y2O3-added AlN ceramic. Two prominent resonance modes, which are essentially responsible for the dielectric properties of the Y2O3-added AlN in terahertz regime, are characterized at ÏTO1/(2Ï)Â =Â 2.76Â THz (92Â cmâ1) and ÏTO2/(2Ï)Â =Â 18.2Â THz (605Â cmâ1) and are well described by the pseudo-harmonic oscillator model through theoretical fitting. The resonance ÏTO1 at 2.76Â THz is proposed to be due to the formation of a YAG (Y3Al5O12) secondary phase in Y2O3-added AlN ceramic. From the experimental results, good correlation is observed between the prominent peak of YAG secondary phase at 2.76Â THz and thermal conductivity. Additionally, there is a high correlation between densification and refractive index of AlN ceramics fabricated by hot pressed sintering.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 388, Part B, 1 December 2016, Pages 741-745
Journal: Applied Surface Science - Volume 388, Part B, 1 December 2016, Pages 741-745
نویسندگان
Seung Beom Kang, Dong Chul Chung, Sung-Jin Kim, Jun-Ki Chung, Sang-Yeup Park, Ki-Chul Kim, Min Hwan Kwak,