Pengaruh Suhu Sintering terhadap Pembentukan Senyawa Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d
Abstract
Research has been conducted variations in sintering temperature between 900 ºC – 950 ºC for 12 hours on the synthesis phase of Gd1Ba2Cu3O7-d substituted La and Sr with stoichiometric composition Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d. This study is intended to find out at what temperature the compound Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d can be formed to the maximum. Samples with composition Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d made from the raw materials Gd2O3, La2O3, BaO, Sr2O3 and CuO. Samples are synthesized using solid-state reaction method by wet mixing with nitric acid (HNO3) as solvent. The sample is sintering in the form of pellets in the furnace without annealing of oxygen gas. The synthesis results were characterized by X-Ray Diffraction (XRD) and analyzed with the Match-3 Program. By using the Entry number 96-153-9606, the results of it analysis showed that sintering temperature had an impact on the formation of phase compounds Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Show that the volume fraction is increases with increasing of the sintering temperature, especially from temperatures of 930 ºC to 950 ºC. The highest volume fraction of 75.43% was obtained in samples that sintering at 950 ºC. Refinement results with Rietveld analysis method showed phase Gd0.95La0.05Ba1.95Sr0.05Cu3O7-d formed is in orthorhombic symmetry. The volume of cell units is likely to increase as the temperature increases.
Abstrak
Telah dilakukan penelitian variasi suhu sintering antara 900 ºC - 950 ºC selama 12 jam pada sintesis fase Gd1Ba2Cu3O7-d tersubstitusi La dan Sr dengan komposisi stoikiometri Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Penelitian ini bertujuan untuk mengetahui pada suhu berapa senyawa Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d dapat terbentuk secara maksimal. Sampel dengan komposisi Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d dibuat dari bahan awal Gd2O3, La2O3, BaO, Sr2O3 dan CuO. Sampel disintesis dengan menggunakan metode reaksi padatan (solid-state reaction) dengan pencampuran basah (wet-mixing) dengan asam nitrat (HNO3) sebagai pelarut. Sampel disintering dalam bentuk pelet di dalam tungku tanpa pemberian annealing gas oksigen. Sampel hasil sintesis dikarakterisasi dengan X-Ray Difraction (XRD) dan dianalisis dengan Program Match-3. Dengan menggunakan referensi Entry number 96-153-9606, hasil analisisnya menunjukkan bahwa suhu sintering adalah berdampak terhadap pembentukan senyawa fase Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d. Memperlihatkan bahwa fraksi volume bertambah seiring dengan bertambahnya suhu sintering, terutama pada suhu 930 °C sampai dengan 950 °C. Fraksi volume tertinggi sebesar 75,43 % didapat pada sampel yang disintering pada suhu 950 °C. Hasil refinemen dengan metode analisis Rietveld menunjukkan fase Gd0,95La0,05Ba1,95Sr0,05Cu3O7-d yang terbentuk adalah dalam simetri ortorombik. Volume unit sel adalah cenderung meningkat seiring bertambahnya suhu sintering.
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References
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