Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O melts

R. D. Hunt; E. C. Beahm; G. F. Voronin

doi:10.1016/S0921-4534(98)00201-9

Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O melts

R. D. Hunt, E. C. Beahm, G. F. Voronin

Fuel Cycle Chemical Technology

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Abstract

The oxygen content and phase transition temperatures of equilibrated samples with Y:Ba:Cu:O molar ratios of 1:2:3:n (YBa₂Cu₃O_x phase) and 1:3:4:n (YBa₂Cu₃O_x + BaCuO₂ phases) were determined with a differential thermal analyzer (DTA), a thermal gravimetric analyzer (TGA) and an electrochemical oxygen analyzer. These Y-Ba-Cu-O melts were studied at partial oxygen pressures that ranged from 1 × 10⁵ to 6 Pa and at temperatures from 1200 to 1580 K. The oxygen contents of these melts were determined with hydrogen reduction and the TGA. The oxygen content of the 1:2:3:n melts decreased as the temperature increased and as the partial oxygen pressure decreased. The same pattern for the partial oxygen pressure was observed for the oxygen content in the 1:3:4:n melts. However, at a given partial oxygen pressure, the highest oxygen content in a 1:3:4:n melt was observed at a temperature approximately 100 K above the initial melting temperature. The liquidus temperatures for 1:2:3:n and 1:3:4:n always decreased as the partial oxygen pressures decreased. Finally, the compositions of the melts, which included the formation of YBa₃Al₂O_7.5 in the 1:3:4:n melts, are also discussed.

Original language	English
Pages (from-to)	130-136
Number of pages	7
Journal	Physica C: Superconductivity and its Applications
Volume	302
Issue number	2-3
DOIs	https://doi.org/10.1016/S0921-4534(98)00201-9
State	Published - Jun 20 1998

Funding

This work was sponsored by the Office of Basic Energy Sciences, Materials Science Division, U.S. Department of Energy, under contract DE-AC05-96OR22464 with the Lockheed Martin Energy Research as well as Russian Foundation for Basic Research under grant 96-03-32770 and Russian State Program on High Temperature Superconductivity under grant 96.136.

Funders	Funder number
Lockheed Martin Energy Research
Russian State Program on High Temperature Superconductivity	96.136
U.S. Department of Energy	DE-AC05-96OR22464
Basic Energy Sciences
Division of Materials Sciences and Engineering
Russian Foundation for Basic Research	96-03-32770

Keywords

Oxygen stoichiometry
Phase diagram
Structural phase transition

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10.1016/S0921-4534(98)00201-9

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title = "Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O melts",

abstract = "The oxygen content and phase transition temperatures of equilibrated samples with Y:Ba:Cu:O molar ratios of 1:2:3:n (YBa2Cu3Ox phase) and 1:3:4:n (YBa2Cu3Ox + BaCuO2 phases) were determined with a differential thermal analyzer (DTA), a thermal gravimetric analyzer (TGA) and an electrochemical oxygen analyzer. These Y-Ba-Cu-O melts were studied at partial oxygen pressures that ranged from 1 × 105 to 6 Pa and at temperatures from 1200 to 1580 K. The oxygen contents of these melts were determined with hydrogen reduction and the TGA. The oxygen content of the 1:2:3:n melts decreased as the temperature increased and as the partial oxygen pressure decreased. The same pattern for the partial oxygen pressure was observed for the oxygen content in the 1:3:4:n melts. However, at a given partial oxygen pressure, the highest oxygen content in a 1:3:4:n melt was observed at a temperature approximately 100 K above the initial melting temperature. The liquidus temperatures for 1:2:3:n and 1:3:4:n always decreased as the partial oxygen pressures decreased. Finally, the compositions of the melts, which included the formation of YBa3Al2O7.5 in the 1:3:4:n melts, are also discussed.",

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author = "Hunt, {R. D.} and Beahm, {E. C.} and Voronin, {G. F.}",

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T1 - Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O melts

AU - Hunt, R. D.

AU - Beahm, E. C.

AU - Voronin, G. F.

PY - 1998/6/20

Y1 - 1998/6/20

N2 - The oxygen content and phase transition temperatures of equilibrated samples with Y:Ba:Cu:O molar ratios of 1:2:3:n (YBa2Cu3Ox phase) and 1:3:4:n (YBa2Cu3Ox + BaCuO2 phases) were determined with a differential thermal analyzer (DTA), a thermal gravimetric analyzer (TGA) and an electrochemical oxygen analyzer. These Y-Ba-Cu-O melts were studied at partial oxygen pressures that ranged from 1 × 105 to 6 Pa and at temperatures from 1200 to 1580 K. The oxygen contents of these melts were determined with hydrogen reduction and the TGA. The oxygen content of the 1:2:3:n melts decreased as the temperature increased and as the partial oxygen pressure decreased. The same pattern for the partial oxygen pressure was observed for the oxygen content in the 1:3:4:n melts. However, at a given partial oxygen pressure, the highest oxygen content in a 1:3:4:n melt was observed at a temperature approximately 100 K above the initial melting temperature. The liquidus temperatures for 1:2:3:n and 1:3:4:n always decreased as the partial oxygen pressures decreased. Finally, the compositions of the melts, which included the formation of YBa3Al2O7.5 in the 1:3:4:n melts, are also discussed.

AB - The oxygen content and phase transition temperatures of equilibrated samples with Y:Ba:Cu:O molar ratios of 1:2:3:n (YBa2Cu3Ox phase) and 1:3:4:n (YBa2Cu3Ox + BaCuO2 phases) were determined with a differential thermal analyzer (DTA), a thermal gravimetric analyzer (TGA) and an electrochemical oxygen analyzer. These Y-Ba-Cu-O melts were studied at partial oxygen pressures that ranged from 1 × 105 to 6 Pa and at temperatures from 1200 to 1580 K. The oxygen contents of these melts were determined with hydrogen reduction and the TGA. The oxygen content of the 1:2:3:n melts decreased as the temperature increased and as the partial oxygen pressure decreased. The same pattern for the partial oxygen pressure was observed for the oxygen content in the 1:3:4:n melts. However, at a given partial oxygen pressure, the highest oxygen content in a 1:3:4:n melt was observed at a temperature approximately 100 K above the initial melting temperature. The liquidus temperatures for 1:2:3:n and 1:3:4:n always decreased as the partial oxygen pressures decreased. Finally, the compositions of the melts, which included the formation of YBa3Al2O7.5 in the 1:3:4:n melts, are also discussed.

KW - Oxygen stoichiometry

KW - Phase diagram

KW - Structural phase transition

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Partial oxygen pressure and temperature effects on the oxygen content of the Y-Ba-Cu-O melts

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