2223 Phase Formation in Bi(Pb)─Sr─Ca─Cu─O: III, The Role of Atmosphere

Chen, Yan Ling; Stevens, R.

doi:10.1111/j.1151-2916.1992.tb05553.x

Cited by 37 publications

(6 citation statements)

References 6 publications

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“…Ca 2 CuO 3 known to be a direct precursor for the formation of Bi-2223, in contrast to Sr 14 Cu 24 O 41 , tends to show that we can raise the Bi-2223 phase content. These results are all the more interesting because the small quantity of Bi-2201 detected at the end of this sintering, and formed in balance with Bi-2223, can be retransformed in Bi-2223 by suitable thermal processing[41]. The results obtained by Sint 10 are what we had anticipated, i.e.…”

supporting

confidence: 59%

Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size

Garnier¹,

Monot²,

Desgardin³

2000

Supercond. Sci. Technol.

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The effects of the calcination conditions (time, temperature, intermediate milling) on the kinetics of formation of Bi-2223 and on the grain size were studied using a powder precursor synthesized by the polymer matrix method. The samples were characterized by XRD and SEM analysis. The grain size and the kinetics of formation of Bi-2223 strongly depend on the calcination conditions and thus on the phase assemblages formed at the end of the calcination that determines the reactivity during sintering. The higher the calcination temperature is the larger the grain size. We have observed that 24 h of calcination at 820 °C without intermediate milling allows one to obtain 79% of Bi-2223 phase in 60 h of sintering at 835 °C.

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supporting

confidence: 59%

Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size

Garnier¹,

Monot²,

Desgardin³

2000

Supercond. Sci. Technol.

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“…According to Wong-Ng et al [76], excess amounts of Ca and Cu are needed for the formation of significant quantities of high-T c phase. Chen and co-worker [60,77,78] found that the optimum composition should be stoichiometric in Ca and Cu, but with a slight excess of Pb. However, all these reports have in common that the chemical composition of the glassy material after the quenching step was not analyzed.…”

Section: Discussionmentioning

confidence: 98%

Critical aspects on preparation of Bi-2223 glassy precursor by melt-process

Nilsson

Gruner

Acker³

et al. 2008

Journal of Non-Crystalline Solids

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“…BiSrCaCuO is a high-temperature superconducting material, and its general formula is Bi 2 Sr 2 Ca n−1 Cu n O 2n+4 , where n=1, 2 and 3, with corresponding superconducting phases of Bi-2201 (T C =20 K), Bi-2212 (T C =85 K) and Bi-2223 (T C =110 K), respectively [10][11][12][13][14][15][16][17][18]. Pure Bi-2223 and Bi-2212 single phases are difficult to obtain because they are symbiotic with each other, especially when forming the Bi-2223 phase [19][20][21][22]. However, partial replacement of Bi by Pb can increase the volume content of the Bi-2223 phase, thereby making it easy to synthesize and increasing its stability [23,24].…”

Section: Introductionmentioning

confidence: 99%

Smart Metastructure Method for Increasing TC of Bi(Pb)SrCaCuO High-Temperature Superconductors

Chen

Wang

et al. 2020

J Supercond Nov Magn

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Improving the critical transition temperature (T C ) of Bi(Pb)SrCaCuO (B(P)SCCO) high-temperature superconductors is important, however, considerable challenges exist. In this study, we designed a smart meta-superconductor B(P)SCCO consisting of B(P)SCCO microparticles and Y 2 O 3 :Eu 3+ +Ag topological luminophor based on a metamaterial structure and the idea that the injecting energy will promote the formation of Cooper pairs. In the applied electric field, the Y 2 O 3 :Eu 3+ +Ag topological luminophor generates an electroluminescence (EL), thereby promoting the T C via EL energy injection. A series of Y 2 O 3 :Eu 3+ +Ag topological luminophor-doped B(P)SCCO samples was prepared. Results showed that Y 2 O 3 :Eu 3+ +Ag was dispersed around B(P)SCCO particles, forming a metastructure. Accordingly, the onset temperature (𝑇 𝐶,𝑜𝑛 ) and zero resistance transition temperature (𝑇 𝐶,0 ) of B(P)SCCO increased. The 0.1 wt% Y 2 O 3 :Eu 3+ +Ag doping B(P)SCCO sample exhibited a large increase, and 𝑇 𝐶,0 and 𝑇 𝐶,𝑜𝑛 were increased by 13 K and 4 K, respectively. The B(P)SCCO sample doped with 0.2 wt% Y 2 O 3 or Y 2 O 3 :Sm 3+ nonluminous inhomogeneous phase was also prepared to further prove the influence of EL on the 𝑇 𝐶,0 and 𝑇 𝐶,𝑜𝑛 rather than the rare earth effect. Results indicated that the 𝑇 𝐶,𝑜𝑛 of the Y 2 O 3 or Y 2 O 3 :Sm 3+ doping sample decreased, and the 𝑇 𝐶,0 slightly increased. However, the 𝑇 𝐶,0 and 𝑇 𝐶,𝑜𝑛 of the 0.2 wt% Y 2 O 3 :Eu 3+ +Ag topological luminophor-doped sample improved by 8 K and 4 K, respectively. This outcome further demonstrated that the smart metastructure method can improve the T C of B(P)SCCO.

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2223 Phase Formation in Bi(Pb)─Sr─Ca─Cu─O: III, The Role of Atmosphere

Cited by 37 publications

References 6 publications

Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size

Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size

Critical aspects on preparation of Bi-2223 glassy precursor by melt-process

Smart Metastructure Method for Increasing TC of Bi(Pb)SrCaCuO High-Temperature Superconductors

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