Flux mapping at 77K and local measurement at lower temperature of thin-wall YBaCuO single-domain samples oxygenated under high pressure

Chaud, X.; Noudem, Jacques; Prikhna, T. A.; Savchuk, Yaroslav; Haanappel, E.; Diko, P.; Zhang, C.P.

doi:10.1016/j.physc.2009.05.017

Cited by 22 publications

(11 citation statements)

References 20 publications

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“…In copper oxide high- critical temperature ( T c ) superconductors, such as Nd 2-x Ce x CuO 4±δ 3–5 , Pr 2− x Ce x CuO 4±δ 6–8 and YBa 2 Cu 3 O 7−δ 9–11 , T c can be greatly improved in a large range by adjusting the oxygen content during the annealing process, as well as the titanium oxide systems, such as SrTiO 3 12,13 and TiO 14,15 . Oxygen has a strong effect not only on superconductivity, but also on many other properties.…”

Section: Introductionmentioning

confidence: 99%

The effects of oxygen in spinel oxide Li1+xTi2−xO4−δ thin films

Jia

et al. 2018

Sci Rep

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The evolution from superconducting LiTi2O4-δ to insulating Li4Ti5O12 thin films has been studied by precisely tuning the oxygen pressure in the sample fabrication process. In superconducting LiTi2O4-δ films, with the increase of oxygen pressure, the oxygen vacancies are filled gradually and the c-axis lattice constant decreases. When the oxygen pressure increases to a certain critical value, the c-axis lattice constant becomes stable, which implies that the sample has been completely converted to Li4Ti5O12 phase. The two processes can be manifested by the angular bright-field images of the scanning transmission electron microscopy techniques. The transition temperature (Tch) of magnetoresistance from the positive to the negative shows a nonmonotonic behavior, i.e. first decrease and then increase, with the increase of oxygen pressure. We suggest that the decrease Tch can be attributed to the suppressing of orbital-related state, and the inhomogeneous phase separated regions contribute positive MR and thereby lead to the reverse relation between Tch and oxygen pressure.

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Section: Introductionmentioning

confidence: 99%

The effects of oxygen in spinel oxide Li1+xTi2−xO4−δ thin films

Jia

et al. 2018

Sci Rep

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“…The Y123 matrix, in bright contrast, comprises Y211 particles which are uniformly distributed and can be categorized into two types of size: small majority inclusions with a size spanning from 1 to 4 μm, and large minority particles that can reach 18 μm in length. The Y211 particles size is generally larger than that reported elsewhere, perhaps due to the initial Y211 precursor since the single domains were prepared by using the same process.…”

Section: Microstructurementioning

confidence: 67%

“…We have first determined the experimental conditions enabling to reach the optimized trapped field at 77 K . The processed thin‐wall Y123 single domains were thus progressively oxygenated under these conditions of 700 °C and 10 MPa oxygen pressure for 12 h in a classical tubular furnace comprising a vessel resisting oxidization at high temperature under pressure up to 16 MPa . The temperature and pressure cycles were applied and the atmosphere controlled such that: the furnace air is primarily substituted by the nitrogen gas at 30 °C.…”

Section: Progressive Oxygenation At High Temperature Under Pressurementioning

confidence: 99%

An Effective Approach for the Development of Reliable YBCO Bulk Cryomagnets with High Trapped Field Performances

Kenfaui

Sibeud

Louradour

et al. 2014

Adv Funct Materials

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Widespread use of YBa2Cu3O7‐δ (Y123) bulk superconductors as source of strong magnetic fields requires development of high‐performance materials sufficiently reliable with improved thermal transfer ability. An effective approach based primarily on the growth of bulk Y123 single domains comprising a holes‐network to diminish the oxygen diffusion paths is reported here, as well as their progressive annealing at high temperature under oxygen pressure to reduce undue stresses and processing time. Finely, it aims to stimulate the thermal exchange inside the superconductor and compensate for induced magnetic stresses during the field‐trapping process. The approach brings considerable time and energy savings, and turns out to knock down barriers having stymied hitherto the use of Y123 bulk superconductors for engineering applications. Indeed, it enables the achievement of a pore‐free and crack‐free microstructure yielding marked fracture toughness and promoting large size persistent current loops, thereby boosting the trapped field performances. The fostering of the internal thermal exchange leads the maximum trapped field Bmax to shift to higher temperatures by up to 14 K. A value Bmax of 6.34 T is attained at 17 K on ≈16 mm‐diameter reinforced pellet (disk area s = 1.99 cm2), resulting in an outstanding field density Bmax/s=3.19 Tcm−2.

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“…Another unique aspect concerning flux trapping is to distribute holes drilled within the bulk pack. The recently reported [41][42][43][44][45] hole-patterned YBa2Cu3Oy (Y123) bulks with improved superconducting properties are highly interesting from the points of view of material quality and their variety of application. It is well known that the core of plain bulk superconductors needs to be fully oxygenated, and some defects like cracks, pores and voids [46,47] must be suppressed in order that the material can trap a high magnetic field or else carry a high current density.…”

Section: Gd211 Bazro3mentioning

confidence: 99%