Analisis komposisi fasa komposit keramik tersinter MgO-Y2O3 dan MgO- α -Al2O3

Mugiono, Slamet (2006) Analisis komposisi fasa komposit keramik tersinter MgO-Y2O3 dan MgO- α -Al2O3. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

Telah dilakukan analisis komposisi fasa pada komposit keramik MgO-Y₂O₃ (komposit A) dan MgO-α-Al₂O₃ (komposit B) menggunakan data difraksi sinar-X. Komposit keramik disintesis dengan variasi Y₂O₃ sebesar 10%, 20%, dan 30% pada komposit A, serta variasi α-Al₂O₃ yang sama pada komposit B. Kedua komposit disinter pada suhu 1550 °C selama 3 jam. Hasil analisis menunjukkan bahwa tidak ditemukan fasa baru pada komposit A, sedangkan pada komposit B ditemukan fasa baru MgAl₂O₄ (spinel). Analisis komposisi fasa menggunakan metode Rietveld menunjukkan bahwa secara umum terjadi penyimpangan terhadap komposisi yang seharusnya (true content) pada komposit yang telah disinter. Ukuran kristal Y₂O₃ pada komposit A dan ukuran kristal spinel pada komposit B semakin besar dengan bertambahnya persentase komposisi. Sebaliknya, ukuran kristal MgO semakin kecil pada kedua komposit. Besarnya penyimpangan komposisi relatif fasa Y₂O₃ pada komposit keramik A berturut-turut adalah +1,0%, −2,3%, dan −3,9%, sedangkan penyimpangan komposisi fasa spinel pada komposit B adalah +2,1%, −2,3%, dan −8,9%. Hasil ini menunjukkan bahwa besarnya penyimpangan sebanding dengan peningkatan persentase komposisi. Besarnya penyimpangan berat absolut fasa Y₂O₃ pada komposit A berturut-turut adalah 4,2%, 6,8%, dan 15,7%, sedangkan penyimpangan fasa spinel pada komposit B berturut-turut adalah +2,8%, −2,3%, dan −11%. Pemodelan koreksi matematis dapat memperkecil penyimpangan komposisi fasa Y₂O₃ hingga masing-masing sebesar 1,2%, 2,1%, dan 6,1% untuk komposit A, serta fasa spinel hingga masing-masing sebesar 1,1%, 0,5%, dan 5,8% untuk komposit B.
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The phase composition of MgO-Y₂O₃ ceramic composites (composite A) and MgO-α-Al₂O₃ ceramic composites (composite B) was analyzed using X-ray diffraction data. The ceramic composites were synthesized with Y₂O₃ content variations of 10%, 20%, and 30% for composite A and the same α-Al₂O₃ content variations for composite B. Both composites were sintered at 1550 °C for 3 hours. The analysis showed that no new phase was formed in composite A, whereas a new MgAl₂O₄ (spinel) phase was formed in composite B. Phase composition analysis using the Rietveld method indicated that, in general, deviations from the expected phase composition (true content) occurred in the sintered composites. The crystallite size of Y₂O₃ in composite A and that of spinel in composite B increased with increasing composition percentage. In contrast, the crystallite size of MgO tended to decrease in both composites. The relative phase composition deviations of Y₂O₃ in composite A were +1.0%, −2.3%, and −3.9%, respectively, while those of the spinel phase in composite B were +2.1%, −2.3%, and −8.9%, respectively. These results indicate that the magnitude of the deviation increases with increasing Y₂O₃ or spinel content. The absolute phase composition deviations of Y₂O₃ in composite A were 4.2%, 6.8%, and 15.7%, respectively, while the deviations of the spinel phase in composite B were +2.8%, −2.3%, and −11%, respectively. Mathematical correction modeling reduced the deviations in the Y₂O₃ phase composition to 1.2%, 2.1%, and 6.1%, respectively, for the MgO-Y₂O₃ composites, and reduced the deviations in the spinel phase composition to 1.1%, 0.5%, and 5.8%, respectively, for the MgO-spinel composites.

Item Type:	Thesis (Masters)
Additional Information:	RTFi 620.14 Mug a
Uncontrolled Keywords:	Anal isis komposisi fasa, komposit keramik MgO-Y 203, komposit keramik Mg0-a-Ah03, metode Rietveld, Phase composition analysis, ceramic composites of MgO-Y 203, ceramic composites ofMgO-a-Ah03, Rietveld method.
Subjects:	Q Science > QE Geology > QE389.2 Crystallography.
Divisions:	Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis
Depositing User:	magang .
Date Deposited:	30 Sep 2026 03:29
Last Modified:	30 Sep 2026 03:29
URI:	http://repository.its.ac.id/id/eprint/145072

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