Karakterisasi mikrostruktural material penyerap gelombang elektromagnetik senyawa LaxBa(1-x)Fe0.25Mn0.5Ti0.25O3, (x = 0, 0.25, 0.75, 1) = Microstructural characterization of LaxBa(1-x)Fe0.25Mn0.5Ti0.25O3, (x = 0, 0.25, 0.75, 1), an electromagnetic wave absorbance material
| Main Authors: | Endyas Pratitajati, author, Add author: Azwar Manaf, supervisor, Add author: Muhammad Hikam, examiner, Add author: Dewa Nyoman Adnyana, examiner, Add author: Ridwan, examiner |
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| Format: | Masters Bachelors |
| Terbitan: |
, 2012
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| Subjects: | |
| Online Access: |
https://lib.ui.ac.id/detail?id=20317239 |
Daftar Isi:
- <b>ABSTRAK</b><br> Pertumbuhan butir pada temperatur 1100oC, 1200oC, dan 1300oCkristal LaxBa(1- x)Fe0.25Mn0.5Ti0.25O3 dipelajari. Material sampel dipreparasi menggunakan teknik pengaloyan mekanik (mechanical alloying) dengan waktu penggilingan (high ball energy milling) selama 30 jam. Sintering dilakukan selama 0, 1, 3 dan 6 jam. Material dianalisa menggunakan sinar X. Besar ukuran butir dihitung menggunakan persamaan Debye-Scherrer berdasarkan profil difraksi sinar X-nya. Sifat magnetik diukur menggunakan pemagraf. Sedangkan serapan gelombang mikro diukur menggunakan alat Network Analyzer (VNA) dengan metode Transmission/ Reflection Line (TRL). Semua pengukuran dilakukan pada temperatur kamar. Hasil penelitian menunjukkan bahwa persamaan pertumbuhan butir kristal La0.25Ba0.75Fe0.25Mn0.5Ti0.25O3 mengikuti model persamaan laju difusi . Hasil serapan gelombang mikro menunjukkan adanya serapan pada frekuensi 11-15 GHz. Serapan ini relatif lebih kecil jika dibandingkan dengan serapan material basisnya yakni LaFe0.25Mn0.5Ti0.25O3. Namun daerah serapannya relatif lebih luas daripada material basis tersebut. <hr> <b>Abstract</b><br> Growth of La0.25Ba0.75Fe0.25Mn0.5Ti0.25O3 in the temperatur e1100oC, 1200oC, dan 1300oC during 0, 1, 3 and 6 hours sinteringwas investigated. Sampels was prepared by mechanical alloying techique with high ball energy milling. Milling time is 30 hours. Sample was analized using x-ray diffraction.Grain size was calculated using Debye-Scherrer equation based on their x-ray diffraction profiles. Material absorbance properties was measured using Network Analyzer (VNA) with Transmission/ Reflection Line (TRL) measurement technique. All analysis was conducted in room temperature. Data showed that grain growth of La0.25Ba0.75Fe0.25Mn0.5Ti0.25O3 has followed diffusion rate equation model of . Whilst it microwave absorbance measurement data performed its wide absorbance in the fequency range 11-15 GHz. Despite its relatively small absorbance intensity , La0.25Ba0.75Fe0.25Mn0.5Ti0.25O3 has broader bandwith comparing to its base material LaFe0.25Mn0.5Ti0.25O3