Magnetic characteristics of K-, Na- and Rb-doped YBCO ceramics

Nurgaliev, T.; Miteva, S.; Nedkov, I.; Veneva, A.

doi:10.1016/0304-8853(94)00659-8

Cited by 2 publications

(2 citation statements)

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“…Particularly, the deposition of the REBCO layer via CSD has clear advantages over other techniques, though: The preparation of the precursor solutions is utterly simple and therefore cheap, and the composition can be easily altered through solution mixing or additions of further soluble salts. With this, a plethora of inclusions for pinning enhancement is accessible: atomic-scale doping [20] on the RE [21][22][23], the Ba [24][25][26], and the Cu [27][28][29] site or secondary phase additions of various compositions (e.g. Y 2 O 3 [30], BaZrO 3 [31,32], BaHfO 3 [33][34][35], BaSnO 3 [36], Ba 2 YTaO 6 [37], Ba 2 YNbO 6 [38]), forms (spherical, plate-like, rectangular, etc) and amount.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c

Erbe

Cayado

Freitag

et al. 2020

Supercond. Sci. Technol.

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REBa 2 Cu 3 O 7−x (REBCO, RE = rare earth) compounds with different single RE elements were grown via TFA-MOD (metal-organic deposition of trifluoroacetates) to clarify their T c values when grown by the same preparation method and their processing windows; here: the crystallisation temperatures at a constant process gas composition (pO 2 , pH 2 O). We focussed on the lanthanides (Ln) Nd, Sm, Gd, Dy, Ho, Er and Yb as substituents for Y in the REBCO phase and investigated their growth behaviour in terms of resulting physical (inductive T c and J c (77 K)) and structural properties (determined by XRD, SEM, TEM). All phases were grown as pristine films on LaAlO 3 and SrTiO 3 and compared to their respective nanocomposites with 12 mol% BaHfO 3 for in-field pinning enhancement.With regard to T c and J c (77 K), the optima of both values shift towards higher growth temperatures for increasing and decreasing RE ion size with respect to yttrium. Highest T c values achieved so far do not show a trend that can solely be related to the RE ionic size. On the contrary, T c,90 values of the LnBCO compounds from Sm to Er range between 94.0 and 95.3 K and are, therefore, significantly larger than the highest values of the average-size non-lanthanide, Y, with T c,90 = 91.5 K. J c,sf values at 77 K seem to plateau between 5 and 6 MA cm −2 from Sm to Er and are again clearly above the maximum values we ever achieved for Y with 4.2 MA cm −2 . REBCO phase formations of the very small Yb and large Nd turned out to be more difficult and require further adjustment of growth parameters. All REBCO phases investigated here show distinct dependences of T c on the lattice parameter c.

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Section: Introductionmentioning

confidence: 99%

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c

Erbe

Cayado

Freitag

et al. 2020

Supercond. Sci. Technol.

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“…The electromagnetic characteristics of the HTS pellets were measured mainly at 77 K. To investigate the screening ability of the pellets, we applied a spatially uniform magnetic field perpendicularly to the sample's surface and registered the response signal [5]. The hysteresis loops were obtained using a miniature Hall probe placed near the specimen's surface [6], and the average critical current density J c (and its field dependence) were found in the approximation of the modified version of Bean's model.…”

Section: Methodsmentioning

confidence: 99%

Grain boundary contribution to the a.c. field behaviour of doped YBCO ceramics

Nedkov¹

1998

Supercond. Sci. Technol.

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The volume of the grain boundaries is a small percentage of the total volume of a polycrystalline superconducting material, but their contribution to the superconductor's properties is paramount. The present work analyses the influence of the variation of the relative fraction of the grain boundary volume, as well as the presence of alkaline additives (K and Rb) and CuO, on the hysteretic losses, the ability to screen low-frequency a.c. fields, the critical current density and the superconducting transition temperature. The data obtained are indicative of a strong dependence on the type of dopant accumulated on the grain boundaries and on the degree of recrystallization of the HTS. The influence of the internal grain pore boundaries caused by the intensification of the recrystallization process is discussed.

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Magnetic characteristics of K-, Na- and Rb-doped YBCO ceramics

Cited by 2 publications

References 5 publications

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c

Grain boundary contribution to the a.c. field behaviour of doped YBCO ceramics

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Magnetic characteristics of K-, Na- and Rb-doped YBCO ceramics

Cited by 2 publications

References 5 publications

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T c

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T c

Grain boundary contribution to the a.c. field behaviour of doped YBCO ceramics

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Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c

Comparative study of CSD-grown REBCO films with different rare earth elements: processing windows and T _c