Phase stability limits of Bi2Sr2Ca1Cu2O8+δ and Bi2Sr2Ca2Cu3O10+δ

Rubin, L.; Orlando, T. P.; Sande, J. B. Vander; Gorman, G.; Savoy, R.; Swope, R.; Beyers, R.

doi:10.1063/1.108335

Cited by 72 publications

(16 citation statements)

References 7 publications

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“…21 The melting of the 2212 phase and its subsequent recrystallization at higher temperature was reproduced several times in the first two months of experiments. Interestingly, no evidence was found for 2223 growth at any temperature despite the fact that the atmosphere and temperatures studied are commonly reported as favorable for formation of 2223.…”

Section: Ag Substratementioning

confidence: 96%

High-temperature x-ray diffraction studies of a precursor mixture for Pb-substituted Bi-2223 superconducting wires

et al. 1998

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High-temperature x-ray diffraction measurements of a (Bi, Pb)-2223 precursor mixture used to produce high-Jc superconducting tapes were conducted on silver and ZrO2 substrates. The precursor mixture consisted primarily of 2212, Ca2PbO4, and CuO. Phase evolution was markedly sensitive to oxygen partial pressure: In 10% O2 growth of the 2223 phase on silver was rapid, proceeded at the expense of the 2212 phase, and was preceded by the disappearance of the Ca2PbO4 phase. When slowly heated on a silver substrate in 7.5% O2 the 2212 phase melted near 800 °C and subsequently recrystallized near 820 °C in a highly textured form, but with no detectable 2223 formation. Under similar conditions on a ZrO2 substrate, the mixture exhibited no marked changes in the XRD patterns up to 850 °C. The dramatic reactivity on silver was also highly dependent on heating rate; rapid heating in 7.5% O2 to 825 °C did not result in melting of the 2212 phase or appearance of the 2223 phase. In experiments leading to formation of 2223, the c-lattice parameter of the 2212 phase contracted just prior to the onset of formation of 2223. This result is consistent with the formation of an intermediate Pb-doped phase of 2212. A transient amorphous phase appeared briefly at the onset of formation of 2223. No evidence for intergrowth conversion of 2212 to 2223 was observed.

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Section: Ag Substratementioning

confidence: 96%

High-temperature x-ray diffraction studies of a precursor mixture for Pb-substituted Bi-2223 superconducting wires

et al. 1998

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“…The reason for its presence in our samples could be twofold, in principle: on one hand, it could be interpreted as an incomplete synthesis of the 2223 phase by means of the reaction 1=2CuO Ca 2 CuO 3 2212 3 2223 [14]; on the other hand, it could result from the decomposition reaction 42223 3 42212 2Ca 2 CuO 3 Cu 2 O 1=2O 2 that can take place because of an insucient oxygen pressure [17,18]. From a general point of view, the evidence of an increasing amount of Ca 2 CuO 3 with increasing the annealing temperature or duration seems to support the latter interpretation, and we agree with such hypothesis, arguing that the 2223 phase decomposition in our samples could result from a low local oxygen partial pressure in the microcavities which are formed in the bulk as the sintering proceeds.…”

Section: Resultsmentioning

confidence: 99%

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

Manfredotti

Truccato

Rinaudo

et al. 2001

Physica C: Superconductivity

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We have developed a reliable method based on AC magnetic susceptibility measurements to determine the Bi 2 Sr 2 Ca 2 Cu 3 O 10x (2223) phase volume fraction and the average grain radius in multiphasic polycrystalline Bi±Sr±Ca± Cu±O samples. Precision and applicability of the method are discussed and compared with those of the XRD peak integration procedure. The method is used to investigate the in¯uence of the annealing temperature on the synthesis of the 2223 phase in air. The results show that, for a 120 h annealing time, T 849°C is the most favourable among the investigated temperatures. Evidence is also given that higher temperatures promote the decomposition of the 2223 phase into the Bi 2 Sr 2 CaCu 2 O 8x (2212) phase and impurities. Ó

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“…Several 13 mm diameter ϫ 2 mm thermodynamics are known. [1][2][3] However, for more highly oxithick disks were isopressed from the two different ceramic dizing conditions there is little thermodynamic information batches. available.…”

Section: Methodsmentioning

confidence: 99%

Upper‐Phase Stability Limit of Bi‐2212

MacManus‐Driscoll

1997

Journal of the American Ceramic Society

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The upper stability line for Bi2Sr2CaCu2O8+α (Bi‐2212) was determined over the temperature range 540°–800°C and the oxygen partial pressure range 1.5 ×101‐7.4× 10‐3 atm using coulometric titration and high oxygen pressure annealing. The decomposition products resulting from Bi‐2212 oxidation are CuO, two alkaline‐earth bismuthates, and the Raveau phase, Bi11Sr9Cu5Oy. The main alkaline‐earth bismuthate is a known phase of cation composition Bi:Sr:Ca = 2.00:2.48:1.19 (Bi:Sr:Ca 9:11:5). The other alkaline‐earth bismuthate is a minor phase of cation composition Bi:Sr:Ca = 2.00:0.53:0.39. The kinetics for Bi‐2212 decomposition are very slow; e.g., at 700°C in air, the reaction is incomplete after 7 days.

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Phase stability limits of Bi2Sr2Ca1Cu2O8+δ and Bi2Sr2Ca2Cu3O10+δ

Cited by 72 publications

References 7 publications

High-temperature x-ray diffraction studies of a precursor mixture for Pb-substituted Bi-2223 superconducting wires

High-temperature x-ray diffraction studies of a precursor mixture for Pb-substituted Bi-2223 superconducting wires

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

Upper‐Phase Stability Limit of Bi‐2212

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