Melt-textured YBaCuO with High Trapped Fields up to 1.3 T at 77 K

Abstract

CeO2-doped YBaCuO monoliths synthesized with a top-seeded melt growth process in a conventional box furnace exhibited values of trapped magnetic field of up to 1.33 T at 77 K. To our knowledge, this is the highest value of trapped field reported for a melt-textured YBaCuO monolith. A suitable temperature profile and the use of high-density Y2BaCuO5 substrates led to reproducible single-domain crack-free samples investigated by optical and scanning electron microscopy and trapped field measurements. The zero-field-cooled levitation forces at 77 K of standard samples amounted to 70–83 N. A transport critical current density of up to 1.3 × 105 A/cm2 in self field at 77 K was obtained.

Infiltration and Top Seed Growth‐Textured YBCO Bulks With Multiple Holes

“…3) of the samples reveal the typical microstructural features known 13 from melt‐processed bulk materials. In the present ITSG process, no specific efforts like doping 17,18 or irradiation 19 have been made to optimize the Y211 particle size and defect density in further improving the critical current densities. The average size of Y211 particles is determined at 1 μm for the ITSG samples compared with 2.4 μm for conventional TSMTG 13 ones.…”

Magnetic and transport measurements on melt-textured DyBCO single domains

“…The micro structure of bulk melt-textured (RE) BCO materials (RE = Y, Nd, Dy, ...) consists of large grains, called domains, characterized by a high critical current density J c as well as a large irreversibility field H irr at T = 77 K [1][2][3][4][5][6]. Therefore these materials are promising candidates for various engineering applications [7,8].…”

Physical principles of development of magneto-levitation systems based on the second generation high temperature superconducting composites (Review)

“…It is achieved by texturing the materials and improving the orientation of grains, improving the conductivity of grain boundaries (absence of weak links between grains) and creation of the centers of pinning of magnetic flux. Main methods of synthesis of materials with a high texturing degree include the following [18,19]: slow cooling down in homogeneous temperature field (with zero temperature gradient); slow cooling down in gradient temperature field without movement of the sample (Bridgman method); gradient crystallization with hot zone movement (Zone-Melt (MZ))zone melt method; seeded directional solidification (Seeded-Directional-Solidification (SDS)); top seeded melt growth (Top-Seeded-Melt-Growth (TSMG)); texturing in the magnetic field, as well as other methods, whose description can be found in the literature [18][19][20][21][22][23][24][25][26][27][28][29][30].…”