Document Details
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Document Type |
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Thesis |
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Document Title |
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MICROWAVES EFFECT ON NITRIDE CERAMICS AT HIGH TEMPERATURES تأثير الميكرويف على مواد نيتريدات السيراميك عند درجات حرارة عالية |
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Subject |
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physics department |
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Document Language |
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Arabic |
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Abstract |
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Microwave dielectric measurements of nitride ceramics are determined using the cavity perturbation technique. Three samples of nitride ceramics, aluminum nitride, AlN, silicon nitride, Si_3 N_4, and boron nitride, BN, are selected for these measurements. The complex permittivity’s two parts, ε' and ε'', of these samples are measured in frequency ranges, 615 MHz, 1412 MHz, 2214 MHz, 3017 MHz and 3820 MHz at temperatures range from 25℃ to 2000℃. Electric conductivity, σ, activation energy, E_A, and the frequency exponent, n, are calculated from the complex permittivity in the same microwave frequencies and temperatures range. The structural characterizations of these samples of nitride ceramics before and after the microwave measurements are determined using the X-ray diffraction, XRD, Fourier transform infrared spectroscopy, FTIR, and scanning electron microscopy, SEM. The goal of this work is to compare the microwave measurements of the dielectric properties of nitride ceramics to the structural measurements.
The results show that the materials remain stable but around 1000℃ the nitride ceramics begin absorbing microwaves, their conductivities increase and some changes in their structures occur. |
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Supervisor |
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Prof. Thoria A. Baeraky |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1433 AH
2012 AD |
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Co-Supervisor |
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Dr. Hala A. Aljawhari |
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Added Date |
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Sunday, March 18, 2012 |
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Researchers
| يمان حسين أفندي | Afandi, Yaman HUSSEIN | Researcher | Master | |
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