Effects of Pb Content on the Formation of the High-T<sub>c</sub> Phase in the (Bi, Pb)-Sr-Ca-Cu-O System

Rhee, Chang Kyu; Kim, C. J.; Lee, H. G.; Kuk, Il-Hyun; Lee, J. M.; Chang, In-Soon; Rim, Chang Saeng; Han, P. S.; Pyun, Su‐Il; Won, Dong-Yeon

doi:10.1143/jjap.28.l1137

Cited by 37 publications

(13 citation statements)

References 11 publications

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“…In order to partition Mo into the more stable binary aluminide phases, the solubility limit must be increased. Experimental evidence has shown [3,27,52,[56][57][58][59][60][61][62] that the introduction of Si into the Al reduces the thickness and changes the phase constituents of the interdiffusion layer. There is strong evidence of the absence of the U 6 Mo 4 Al 43 phase [52] in the interdiffusion layer due to the fact that UAl 3 phase can accommodate Mo as (U,Mo)(Al,Si) 3 with extended solubility or the mechanism that results in the development of the U 6 Mo 4 Al 43 phase may be disrupted.…”

Section: Discussionmentioning

confidence: 99%

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Perez

Keiser

Sohn

2011

Metall Mater Trans A

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U-Mo dispersion and monolithic fuels are being developed to fulfill the requirements for research reactors, under the Reduced Enrichment for Research and Test Reactors program. In dispersion fuels, particles of U-Mo alloys are embedded in the Al-alloy matrix, while in monolithic fuels, U-Mo monoliths are roll bonded to the Al-alloy matrix. In this study, interdiffusion and microstructural development in the solid-to-solid diffusion couples, namely, U-15.7 at. pct Mo (7 wt pct Mo) vs pure Al, U-21.6 at. pct Mo (10 wt pct Mo) vs pure Al, and U-25.3 at. pct Mo (12 wt pct Mo) vs pure Al, annealed at 873 K (600°C) for 24 hours, were examined in detail. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron probe microanalysis (EPMA) were employed to examine the development of a very fine multiphase interaction layer with an approximately constant average composition of 80 at. pct Al. Extensive TEM was carried out to identify the constituent phases across the interaction layer based on selected area electron diffraction and convergent beam electron diffraction (CBED). The cubic-UAl 3 , orthorhombic-UAl 4 , hexagonal-U 6 Mo 4 Al 43 , and cubicUMo 2 Al 20 phases were identified within the interaction layer that included two-and three-phase layers. Residual stress from large differences in molar volume, evidenced by vertical cracks within the interaction layer, high Al mobility, Mo supersaturation, and partitioning toward equilibrium in the interdiffusion zone were employed to describe the complex microstructure and phase constituents observed. A mechanism by compositional modification of the Al alloy is explored to mitigate the development of the U 6 Mo 4 Al 43 phase, which exhibits poor irradiation behavior that includes void formation and swelling.

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Section: Discussionmentioning

confidence: 99%

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Perez

Keiser

Sohn

2011

Metall Mater Trans A

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“…U 3 Si, U 3 Si 2 and USi react with Al to form a single intermetallic compound, U(AlSi) 3 , in out-ofpile tests of which the test temperatures are typically much higher than the in-pile tests [42]. Rhee et al [43] reported from out-of-pile U 3 Si-Al diffusion tests that they observed a thin layer of U(AlSi) 2 at the interface between Al and IL that turned into U(AlSi) 3 . The solubilities of Al in U 3 Si, U 3 Si 2 and USi themselves are very small (<<1at%) [44].…”

Section: Effect Of Si Content On Il Growth In U-si Compound/al Dispermentioning

confidence: 99%

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Kim¹,

Hofman²

2011

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“…The Bi 2 Sr 2 Ca n−1 Cu n O y system obtaining a layered structure has three different phases with regard to its chemical compositions, the Bi-2201 phase (n = 1, T c ≈ 20 K), the Bi-2212 phase (n = 2, T c ≈ 85 K) and the (Bi, Pb)-2223 phase (n = 3, T c ≈ 110 K) [8]. In these series, the (Bi, Pb)-2223 phase is the most attractive owing to the highest critical temperature (T c ) of about 110 K [9,10]. Nevertheless, the preparation of the (Bi, Pb)-2223 phase is a very difficult task due to the high complexity of the reaction and the appearance of numerous phases as (Bi, Pb)-2212 and Ca 2 PbO 4 during the phase formation [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn Addition on Structural and Superconducting Properties of (Bi, Pb)-2223 Superconducting Ceramics

Yıldırım

Bal

Yücel

et al. 2011

J Supercond Nov Magn

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This study deals with the effect of Mn addition on the structural and superconducting properties of Bi 1.8 Pb 0.4 Sr 2 Mn x Ca 2.2 Cu 3.0 O y ceramics with x = 0, 0.03, 0.06, 0.15, 0.3 and 0.6 by means of X-ray analysis (XRD), scanning electron microscopy (SEM), electron dispersive X-ray (EDX), resistivity, and transport critical current density (J c ) measurements. Zero-resistivity transition temperatures (T c ) of the samples produced via the standard solidstate reaction method are estimated from the dc resistivity measurements. Moreover, the phase fraction and lattice parameters are determined from XRD measurements while the microstructure, surface morphology and element composition analyses of the samples are investigated by SEM and EDX measurements, respectively. It is found that T c values are obtained to decrease from 109 K to 85 K; likewise, J c values are observed to reduce from 3200 A/cm 2 to 125 A/cm 2 with increasing Mn addition. According to the refinement of cell parameters done by considering the structural modulation, the Mn addition is confirmed by both an increase of the lattice parameter a and a decrease of the cell parameter c of the samples in comparison with that of the pure sample (Mn0). SEM measurements show that not only the surface morphology and grain connectivity are seen to degrade but the grain sizes of the samples are found to decrease with the increase of the Mn addition as well. The EDX results reveal that the elements used for the prepara-

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Effects of Pb Content on the Formation of the High-T_c Phase in the (Bi, Pb)-Sr-Ca-Cu-O System

Cited by 37 publications

References 11 publications

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Effect of Mn Addition on Structural and Superconducting Properties of (Bi, Pb)-2223 Superconducting Ceramics

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Effects of Pb Content on the Formation of the High-Tc Phase in the (Bi, Pb)-Sr-Ca-Cu-O System

Cited by 37 publications

References 11 publications

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Effect of Mn Addition on Structural and Superconducting Properties of (Bi, Pb)-2223 Superconducting Ceramics

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Effects of Pb Content on the Formation of the High-T_c Phase in the (Bi, Pb)-Sr-Ca-Cu-O System