Multiple seeding of large plane bulks, rings and cylinders improves the magnetic properties and ensures an optimum geometry for application. Large single grain bulk fabrication of 50–100 mm requires exact precursor phase preparation of RE123 and RE211 and a temperature/ oxygen-controlled furnace process. Top-seed melt growth (TSMG) fabrication methods dominate the bulk production by using single or multiple seeds to prevent unwanted parasitic multi- crystalline nucleation. While BiSCCO compounds play an important role in the conductor development the REBCO melt texture processes provide large crystalline bulks for magnetic application. For the three material groups REBCO (RE: Y, Sm, Gd, Nd, …), BiSCCO (Bi2122, Bi2223), and MgB 2 the processing routes are described and evaluated. The preparation and production of bulk High – Temperature Superconductors (HTS) since the discovery is analysed and reported in their development and progress.
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