کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1623850 | 1516417 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of N-deficient GaN and its enhanced dielectric responses Synthesis of N-deficient GaN and its enhanced dielectric responses](/preview/png/1623850.png)
The GaN powders were synthesized by the reaction of Ga2O3 and Li3N and scanning transmission electron microscopy (STEM) analysis showed the as-prepared GaN were N-deficient with the N vacancies reaching as much as 21%. Besides single-phase of the hexagonal GaN, no other phase from impurities can be detected under the high-resolution transmission electron microscopy (HRTEM) observations. The room temperature (RT) frequency spectrums of the relative dielectric constants ɛr were measured and the N-deficient GaN exhibited at least twofold enhancement than that of GaN nanostructure materials, especially at low frequency range. Because of the great number of N vacancies (VN), the rotation direction polarization (RDP) contributes mostly for the enhancement of ɛr in N-deficient GaN.
Journal: Journal of Alloys and Compounds - Volume 460, Issues 1–2, 28 July 2008, Pages 31–35