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| SDMG2 – REBCO masívne monokryštalické supravodiče s vyšším účinným prierezom pre supravodivý prúd pripravované jednosmerným rastom. | |
| Bulk single-grain REBCO superconductors with higher effective cross-section for superconducting current prepared by single-direction growth. | |
| Program: | VEGA |
| Project leader: | Ing. Diko Pavel, DrSc., akademik US Slovenska |
| Annotation: | Currently, REBCO bulk single-grain superconductors (BSS) are produced by the TSMG process and subsequent oxygenation. During the growth of a bulk tetragonal crystal from a small seed, growth sectors are formed growing in the a- and c-crystal direction. This results in macroscopic inhomogeneity of the structure and the associated inhomogeneity of superconducting properties, as well as thermal expansion stresses, which negatively affect the mechanical properties. In addition, during the transformation of a bulk tetragonal REBCO crystal into a superconducting orthorhombic crystal, a network of microcracks is formed, which significantly reduces the effective cross-section for the superconducting current. The presented project aims to improve the homogeneity of the REBCO BSS structure by single-direction growth of a bulk crystal from a large-area seed. The second goal of the project is to increase the effective sample cross section for the superconducting current by additional heat treatment of REBCO BSS. |
| Project webpage: | https://websrv.saske.sk/uef/oddelenia-a-laboratoria/laboratorium-materialovej-fyziky/ |
| Duration: | 1.1.2026 – 31.12.2029 |
| REBCO masívne monokryštalické supravodiče s vyšším účinným prierezom pre supravodivý prúd | |
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| Program: | PostdokGrant |
| Project leader: | Ing. Vojtkova Liudmila, PhD. |
| Duration: | 1.1.2026 – 31.12.2027 |
| REBCOAPL – REBCO masívne supravodiče na báze Y, Gd, Sm a Eu pre praktické aplikácie | |
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| Program: | SRDA |
| Project leader: | Ing. Diko Pavel, DrSc., akademik US Slovenska |
| Annotation: | The project is focused on research and development of selected REBCO bulk singlegrain superconductors (BSS).We will examine YBCO, GdBCO, SmBCO and EUBCO systems, which are currently preferred in terms ofmastering their production technology and specific applications. Based on our latest results, we will focus on thealloying of LREBCO (LRE- light rare earths) with elements that suppress Ba/LRE substitution in the crystal lattice,the addition of nanocrystalline BaCeO3, the bimodal size distribution of pining centres and the configuration ofholes in REBCO BSS. We will apply the research results in the development of BSS production technology withoptimized superconducting and mechanical properties. The use of the research and development results achievedwithin the project is expected by the manufacturer BSS CAN Superconductors s.r.o. |
| Project webpage: | https://websrv.saske.sk/uef/oddelenia-a-laboratoria/laboratorium-materialovej-fyziky/ |
| Duration: | 1.7.2022 – 30.6.2026 |
| Štúdium rastu EuBCO veľkoplošných zárodkov, vhodných pre výrobu masívnych REBCO supravodičov | |
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| Program: | Návratová projektová schéma |
| Project leader: | Ing. Vojtkova Liudmila, PhD. |
| Annotation: | Recently, the trend of growing single crystals is unidirectional growth, where the growth of the crystal takes place from large-area seeds in one growth direction c, which homogenizes their structure, and thus improves superconducting properties. The project deals with the possibility of preparing large-area seeds, usable for the preparation of samples by the SDMG method (growth of a single crystal from below in one growth direction). Since the samples prepared by the SDMG method copy the structure of the seed, for the production of large-area seeds there is a need to optimize the time-temperature regime, with the aim of efficient preparation of seeds of high quality, with an appropriate structure and composition, and with the minimum of structural defects. The repeated use of large-area seeds requires an increase in the plasticity of such samples, which can be achieved by adding silver, thus preventing the formation and propagation of cracks in the seed during cyclic thermal loading. |
| Duration: | 1.1.2025 – 31.1.2025 |