Superconducting properties and microstructure of YBCO HTSC materials with K2CO3 addition

Veneva, A.; Nedkov, I.; Lovchinov, V.

doi:10.1016/0921-4534(94)91627-6

Cited by 8 publications

(1 citation statement)

References 5 publications

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“…(i) The first is chemical core doping. The role of additives in the core is to insert holes or electrons into the oxide superconductor (for instance, doping of Sr into La 2 CuO 4 ) or to enhance a desired phase formation, to improve microstructure and phase formation [1][2][3][4][5][6][7][8]. (ii) The second way is to add certain elements to the sheath.…”

Section: Introductionmentioning

confidence: 99%

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Lovchinov

Dimitrov

Simeonova

et al. 2000

Supercond. Sci. Technol.

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The influence of tellurium (Te) addition to the Bi-Pb-Sr-Ca-Cu-O (B(Pb)SCCO) system on its microstructure and phase formation is investigated. Electron probe microanalysis and scanning electron microscopy analyses show Te diffusion from the superconducting core into the silver sheath of the B(Pb)SCCO tapes. It is established that the initial Te presence in the core does not lead to any essential changes with respect to the superconducting transition temperature (Tc) and critical current density (Jc). However, Te addition appears to be a supporting factor for 2223 phase formation and crystal growth. Final Te incorporation in the silver sheath has an additional strengthening effect on the sheath that makes it more stable to external mechanical damages and gives the opportunity for better protection of the superconducting core.

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Section: Introductionmentioning

confidence: 99%

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Lovchinov

Dimitrov

Simeonova

et al. 2000

Supercond. Sci. Technol.

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Interactions between YBa₂Cu₃O_7‐x and K₂Co₃

Vassilev

1995

Cryst. Res. Technol.

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Interactions between YBa,Cu,O, -x and K,Co,The interactions between YBa2Cu30, --x and K 2 C 0 3 have been studied using thermochemical methods, isothermal annealing of diffusion pairs, optical microscopy, X-ray diffraction, and microprobe analyses. The experiments have shown existence of solubility of YBa2Cu307 --x or its constituents in both solid and liquid K2C03. The barium ions are preferably dissolved In K2C03, whereas potassium cations do not enter massively into the bulk of the YBa2Cu307-,-phase. A eutectic-type phase diagram is supposed for the system K2C03-YBa2Cu30,-,.The so called "green phase" -Y,BaCuO, and a K-Cu-0 compound have been found in the contact zone at 813°C while a "black phase" layer with nominal composition Y1,6Cu2.805,4 has grown at I07 "C.

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Grain boundaries contribution to the complex susceptibility of KCu-Doped YBCO high-temperature superconductors

Nedkov¹,

Veneva²

1997

J Low Temp Phys

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We present results concerning the e[. [L'ct o/'adding potassium and excess copper (1 +5wt.%) complex susceptibility Z,,~ = Z'-JZ" ~[" K('u-doped YBCO was measured as a function of the temperature, the magnetic field amplitude and the KCu concentration. The behavior of the intergraln loss temperature T m was analyzed through the relationship h ~ a(1 -O".The results obtained showed that the presence o/" K3UuO 2 on the gram boundaries changes drastically the intergranular coupling and. within certain concentration limits, improves the crttical HTS (' characteristics. PA CS numbers: 74.72. Bk, 74.25. Ha. ,W. 40. z.

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Superconducting properties and microstructure of YBCO HTSC materials with K2CO3 addition

Cited by 8 publications

References 5 publications

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Interactions between YBa₂Cu₃O_7‐x and K₂Co₃

Grain boundaries contribution to the complex susceptibility of KCu-Doped YBCO high-temperature superconductors

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Superconducting properties and microstructure of YBCO HTSC materials with K2CO3 addition

Cited by 8 publications

References 5 publications

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Phase formation and microstructure of silver-sheathed B(Pb)SCCO tapes influenced by Te additive

Interactions between YBa2Cu3O7‐x and K2Co3

Grain boundaries contribution to the complex susceptibility of KCu-Doped YBCO high-temperature superconductors

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Interactions between YBa₂Cu₃O_7‐x and K₂Co₃