Effect of Ca2PbO4 on the formation of the (2223) phase in the BiPbSrCaCuO system

Muralidhar, M.; Satyavathi, S.; Babu, V. Hari; Peña, O.; Sergent, M.

doi:10.1016/0921-5107(93)90246-j

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…In powder P-3, small amount of Bi-2223 phase starts to form. These phase assemblages are well consistent with the report of Muralidhar et al [17] that Ca PbO would dissolve into Pb and Ca at temperature above 822 C and react with CuO to form Sr,Ca CuO , meanwhile, Pb would incorporate into Bi-2212 to form (Bi,Pb)-2212.…”

Section: Methodssupporting

confidence: 89%

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Jiang¹,

Yoo²,

et al. 2003

IEEE Trans. Appl. Supercond.

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The kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by precursor powders with different phase assemblages have been studied. Our results show that the formation process of 2223 phase is strongly related to the secondary phases in precursors. A variation of the reaction-order, , deduced from the Avrami relation, was observed along with the whole sintering processing. Within a sintering period of 65 h, keeps the value of 0.7 for the tape made from the powder calcined at 830 C, while it changes from 0.3 or 0.4 to 1 for the tapes prepared with the powders calcined at 810 C and 820 C. Based on the analysis of phase formation and transport properties, the optimum calcination conditions for achieving high tapes are discussed.

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Section: Methodssupporting

confidence: 89%

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Jiang¹,

Yoo²,

et al. 2003

IEEE Trans. Appl. Supercond.

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“…This confirms that the 2223 phase can form above 820 • C as pointed out in [19]. It is also in good agreement with the results of Muralidhar et al [20] that Ca 2 PbO 4 would decompose into a lead-rich liquid phase and CaO above 822 • C, then react with CuO to form Ca 2 CuO 3 (2:1 AEC).…”

Section: Characterizations Of Precursor Powderssupporting

confidence: 91%

Optimization of precursor powders for manufacturing Bi-2223/Ag tapes

Jiang

Yoo

et al. 2002

Supercond. Sci. Technol.

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The phase assemblage and particle sizes of precursor powders have been optimized in a sequence for fabricating Ag/BSCCO-2223 composite tapes. Firstly, an optimal calcination temperature was determined based on the experimental results. Then, the precursors calcined at the optimal temperature were ball-milled for different dwell times to obtain varied particle sizes. The effects of both the phase assemblages and particle sizes of the precursor powder on the phase formation, microstructure and transport J c of Bi-2223/Ag tapes have been investigated. The results show that the precursor phase assemblage has a large impact on the reaction routes, microstructure, and J c property. Meanwhile, a fine powder is beneficial for the grain growth, alignment, and J c enhancement in fully reacted tapes. The best J c was achieved in the tape made from the powder after optimizing the phase assemblage and particle size.

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“…Eleven types of powder were prepared according to the different calcination conditions given in table 1. We chose to not exceed 820 • C, in order to avoid the decomposition of Ca 2 PbO 4 (T f = 822 • C) [36] which forms CaO and a liquid phase rich in Pb, because CaO reacts with CuO to form Ca 2 CuO 3 [37], which in turn accelerates the formation of the Bi-2223 phase. Indeed, the initial formation of the Bi-2223 phase occurs around 820 • C [38] and a powder calcined above this temperature generates a great number of Bi-2223 nuclei, thus opposing the growth of the Bi-2223 grains during sintering [39,40] and resulting in the formation of small Bi-2223 grains and, consequently, a weaker J c 2.…”

Section: Characterization Of Calcined Powdersmentioning

confidence: 99%

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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Effect of Ca2PbO4 on the formation of the (2223) phase in the BiPbSrCaCuO system

Cited by 16 publications

References 17 publications

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Kinetics of phase formation and transport properties of Bi-2223/Ag tapes fabricated by various calcined powders

Optimization of precursor powders for manufacturing Bi-2223/Ag tapes

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

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