Abstract
In this paper, single-domain GdBCO bulks have been fabricated by a new Gd + 011 TSIG method with precursor solid phase pellets (PSPPs) of different Gd211 particle sizes and distributions, prepared by solid state reaction with well-mixed (Gd2O3 + BaCuO2) pellets at different temperatures. The novel results indicated that (1) the average size of Gd211 particles in PSPP is monotonically increasing with increasing the sintering temperature up to 1200°C. (2) With increasing the sintering temperature from 950 to 1200°C, the porous ratio and the density of the PSPP are, respectively, monotonically decreasing and increasing. Furthermore when the sintering temperature is less than 1000°C, the porous ratio is higher and the density is lower than the values of the pressed pellets. (3) With increasing the sintering temperature, the average size of Gd211 particles in the GdBCO bulk first decreases and then increases. In addition, the smallest Gd211 particles are obtained in the sample sintered at 1050°C. (4) The maximum levitation force is obtained in the sample sintered at 1150°C with a relatively larger size of Gd211 particles and lower porosity. This result is significant when fabricating high-quality GdBCO bulk superconductors by controlling the porosity, Gd211 particle size, and their distribution characteristic.
Highlights
High-temperature REBCO bulk superconductors (RE is Yb, Y, Gd, Sm, Nd, etc.) are characterized by larger levitation force, higher trapped field, and self-stabilized levitation.ese advantages lead to many applications such as magnetic bearing, flywheel, high-field permanent magnets, and levitated transportation systems [1,2,3,4,5,6]
E pressed pellets prepared in this way were sintered at different temperatures (950, 1000, 1050, 1100, 1150, and 1200°C) for 6 h in the air and furnace cooled to room temperature. e resulting sintered samples were used as the precursor solid-phase pellet (PSPP) for the Gd + 011 Top-seeded infiltration growth (TSIG) process. e liquid phase pellets were prepared from a wellmixed Y2O3, CuO, and 011 powder, which were weighed according to the molar ratio Y2O3 : CuO : 011 1 : 6 : 10, followed by being pressed into the pellets of 30 mm in diameter
Y2O3 or Yb2O3 was pressed into a plate of thickness 2 mm and diameter 30 mm to support the liquid phase at elevated temperature. e configuration of the precursor sample consisted of three cylindrical pellets and stacked up together along their coaxial line: the top one being the precursor solid phase pellets (PSPPs), followed by the liquid phase pellet and the Y2O3 or Yb2O3 pellet
Summary
High-temperature REBCO bulk superconductors (RE is Yb, Y, Gd, Sm, Nd, etc.) are characterized by larger levitation force, higher trapped field, and self-stabilized levitation.ese advantages lead to many applications such as magnetic bearing, flywheel, high-field permanent magnets, and levitated transportation systems [1,2,3,4,5,6]. Top-seeded infiltration growth (TSIG) technique is one of the most popular methods for fabrication of single-grain REBCO bulk superconductors. The traditional TSIG process will take a long time and expensive cost but is inefficient during the fabrication of single-domain REBCO superconductor. In order to reduce the cost and simplify the fabrication process, we have invented a new RE + 011 TSIG method to fabricate single-domain REBCO superconductor by using only one precursor powder BaCuO2 (011) [11,12,13,14,15]. Is method has a considerable number of advantages, for example, improving the production efficiency, reducing the preparation cost, simplifying the experiment process, and enhancing the physical In order to reduce the cost and simplify the fabrication process, we have invented a new RE + 011 TSIG method to fabricate single-domain REBCO superconductor by using only one precursor powder BaCuO2 (011) [11,12,13,14,15]. e traditional solid phase RE211 and the traditional liquid phase (REBa2Cu3O7-y and Ba3Cu5O8) are, respectively, replaced with the new solid phase (RE2O3 + xBaCuO2) and Y2O3 + 6CuO + 10BaCuO2. is method has a considerable number of advantages, for example, improving the production efficiency, reducing the preparation cost, simplifying the experiment process, and enhancing the physical
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