High-temperature phase relationships for YxNd1–xBa2Cu3Oy(0.7 ≤ x ≤ 1.0) superconductors via containerless processing

Olive, J. R.; Hofmeister, William; Bayuzick, R. J.; Vlasse, Marcus

doi:10.1557/jmr.1999.0519

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Moreover, the nucleation of the Nd123 phase seems to take place on the Nd 2 CuO 4 phase with a tetragonal structure, because the BaCuO 2 and CuO phases are cubic and monoclinic structures, respectively. [18][19][20][21] In the previous instances, the Nd123 phase grew dendritically. 8.…”

Section: Discussionmentioning

confidence: 85%

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

et al. 2001

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Small spherical samples (diameter approximately 2 mm) of NdBa 2 Cu 3 O 7−␦ (Nd123) were fully melted in Ar gas flow in an aero-acoustic levitation device and subsequently rapidly cooled by splat quenching. For samples quenched above the liquidus, the microstructual and x-ray-diffraction (XRD) observations suggested the existence of the amorphous phase with small quantities of the BaCuO 2 and BaCu 2 O x . The high-temperature XRD results indicated that the decomposition of the amorphous phase, probably assisted by atmospheric CO 2 and H 2 O, led to formation of the BaCO 3 phase at 400°C and, subsequently, the Nd123 phase was formed by the solid diffusion above 800°C. Another set of Nd123 samples was fully melted in O 2 gas flow, undercooled while levitated, and then splat quenched at a temperature below the peritectic temperature (T P ). These samples possessed a microcrystalline microstructure of the Nd123 phase that was confirmed by XRD. This indicated that the Nd123 phase was solidified directly from the undercooled melt quenched below T P .

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Section: Discussionmentioning

confidence: 85%

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

et al. 2001

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“…3 When samples of Y 0.7 Nd 0.3 Ba 2 Cu 3 O x were fully molten, upon cooling, they solidified as single-phase RE-1:2:3. 3 When samples of Y 0.7 Nd 0.3 Ba 2 Cu 3 O x were fully molten, upon cooling, they solidified as single-phase RE-1:2:3.…”

Section: Introductionmentioning

confidence: 99%

High-temperature phase relationships for Y_xNd_1–xBa₂Cu₃O_y(0 ≤ x ≤ 0.5) superconductors via containerless processing

et al. 1999

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This paper presents the results of drop-tube experiments performed on Y x Nd 1−x Ba 2 Cu 3 O y (0 ഛ x ഛ 0.5) to understand some of the effects of partial substitutions of Nd for Y on the phase relationships in these systems at elevated temperatures. Powders from 50 to 100 m in diameter were processed in pure O 2 at furnace temperatures from 1400 to 1800°C, every 25°C. The resulting samples were examined microstructurally using scanning electron microscopy, energy dispersive spectroscopy, and optical microscopy. Powder x-ray diffraction was performed for phase identification. It was verified that Nd substitution alters phase selection by introducing at least one new phase and allowing for solidification of the superconducting composition directly from the melt via undercooling to below the peritectic transformation temperature. In addition, solidification pathways are altered for samples processed at temperatures just below the liquidus temperature.Microstructural and x-ray diffraction evidence was used to map the liquidus with increasing Nd substitution. It was found that a minimum in this liquidus occurs at or near the composition Y 0.1 Nd 0.9 Ba 2 Cu 3 O x and at a temperature of 1500°C (±25°C).

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Phase selection in the containerless solidification of undercooled CaO · 6Al2O3 melts

Kuribayashi

2004

Acta Materialia

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High-temperature phase relationships for Y_xNd_1–xBa₂Cu₃O_y(0.7 ≤ x ≤ 1.0) superconductors via containerless processing

Cited by 4 publications

References 9 publications

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

High-temperature phase relationships for Y_xNd_1–xBa₂Cu₃O_y(0 ≤ x ≤ 0.5) superconductors via containerless processing

Phase selection in the containerless solidification of undercooled CaO · 6Al2O3 melts

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High-temperature phase relationships for YxNd1–xBa2Cu3Oy(0.7 ≤ x ≤ 1.0) superconductors via containerless processing

Cited by 4 publications

References 9 publications

Formation of NdBa2Cu3O7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

Formation of NdBa2Cu3O7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

High-temperature phase relationships for YxNd1–xBa2Cu3Oy(0 ≤ x ≤ 0.5) superconductors via containerless processing

Phase selection in the containerless solidification of undercooled CaO · 6Al2O3 melts

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High-temperature phase relationships for Y_xNd_1–xBa₂Cu₃O_y(0.7 ≤ x ≤ 1.0) superconductors via containerless processing

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

Formation of NdBa₂Cu₃O_7−δ amorphous phase by combining aero-acoustic levitation and splat quenching

High-temperature phase relationships for Y_xNd_1–xBa₂Cu₃O_y(0 ≤ x ≤ 0.5) superconductors via containerless processing