Effect of Sintering Time on Superconducting Wire Bi-Pb-Sr-Ca-Cu-O With Dopant MgO Sheated Ag Using Powder in Tube Method

Abstract

Telah dilakukan penelitian mengenai variasi waktu proses sintering pada kawat superkonduktor Bi-Pb-Sr-Ca-Cu-O dopan MgO dengan selubung Ag. Bahan-bahan yang digunakan ialah Bismuth (III) Oksida, Timbal (IV) Oksida, Strontium Carbonate, Calcium Carbonate, Copper (II) Oksida dan Magnesium Oksida dengan tingkat kemurnian tinggi. Proses sintering dalam furnance dilakukan pada suhu konstan selama 30 jam dan 9 jam lalu didinginkan dalam tungku. Hasil karakterisasi X-Ray Diffraction dan search match v1.10, sampel kawat superkonduktor monofilamen Bi1.6Pb0.4Sr2Ca2Cu3O10+δ dan Bi1,6Pb0,4Ca1,95Mg0,05Cu3O10+δ dengan variasi waktu sintering masing-masing 30 jam dan 9 jam memiliki nilai intensitas sebesar 993,77cts dan 902,86 cts. Penambahan waktu sintering pada sampel superkonduktor mengakibatkan penurunan fraksi volume 2223 dengan masing-masing nilai fraksi volume sebesar 60% dan 59%, hal ini menunjukkan adanya impuritas berupa senyawa CuO. Parameter kisi diperoleh yaitu Orthorhombic dengan a=5,347 Å, b=5,416 Å dan c=30,67 Å. Hasil morfologi SEM menunjukkan permukaan homogenitas butir sampel terlihat cukup baik, dan terdistribusi secara acak. Pada sampel kawat superkonduktor monofilamen Bi1.6Pb0.4Sr2Ca1.95Mg0.05Cu3O10+δ dengan waktu sintering 30 jam menunjukkan Tconset=72 K dan Tczero=33 K. Sampel kawat superkonduktor monofilamen Bi1.6Pb0.4Sr2Ca1.95Mg0.05Cu3O10+δ dengan waktu sintering 9 jam menunjukkan Tconset=78 K dan Tczero=58 K. Variation of sintering time has been done in Bi-Pb-Sr-Ca-Cu-O superconducting wires dopant MgO using Ag-sheathed. The samples were prepared using highly pure powders of Bismuth (III) Oxide, Lead (IV) Oxide, Strontium Carbonate, Calcium Carbonate, Copper (II) Oxide and Magnesium Oxide. Sintered at a constant temperature for 30 h and 9 h then cooled in the furnace. The structure of the samples was studied by X-Ray Diffraction and search match v1.10. XRD patterns of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ and Bi1,6Pb0,4Ca1,95Mg0,05Cu3O10+δ monofilament superconducting wires using variation of sintering time for 30 h and 9 h have intensity values of 993.77cts and 902.86 cts. The addition of sintering time to superconductor samples resulted decrease in the volume fraction of 2223 with each volume fraction value of 60% and 59% indicating of impurity phases present CuO compounds. The Orthorhombic structure with the lattice constants are calculated as a = 5,347 Å, b = 5,416 Å, and c = 30,67 Å. The surface morphology studied by SEM, show that surface homogeneity, each grain grows in random directions. For the prepared Bi1,6Pb0,4Ca1,95Mg0,05Cu3O10+δ monofilament superconducting wires sample with 30 h, the onset Tc is at 72 K and the resistivity drops to zero at 33 K. Sample of Bi1.6Pb0.4Sr2Ca1.95Mg0.05Cu3O10+δ δ monofilament superconducting wires with 9 h, the onset Tc is at 78 K and the resistivity drops to zero at 58 K. 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