BaO-[1/2]Y[sub 2]O[sub 3]-CuO[sub x] eutectic melting in air

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07066.x· OSTI ID:6933577

Wong-Ng, W; Cook, L P ^[1]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Ceramics Div.

Eutectic melting in the BaO-[1/2]Y[sub 2]O[sub 3]-CuO[sub x] system has been investigated, using three different compositions. Thermal events up to 1,100 C were studied by means of differential thermal analysis/thermogravimetric analysis (DTA/TGA). Phase formation and compositions of melts were examined using powder X-ray diffraction and scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM/EDS) of quenched experiments. The eutectic occurs at 923 [+-] 10 C in CO[sub 2]-, and H[sub 2]O-scrubbed air, and the eutectic melt has a Ba:Y:Cu cation ratio of 23.2([+-]0.5):0.5([+-]0.1):76.3(1.0). The oxygen content of the quenched eutectic melt, as determined by hydrogen reduction, indicated that nearly all of the copper in the melt was present as Cu[sup +]. A topological sequence, based on the X-ray results, is presented which describes the events immediately following melting.

• OSTI ID: 6933577
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:7; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
MELTING
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES