Study of phase behavior in the YBa2Cu3O7−−BaCuO2+−CuO−Ag system

Lindemer, T.B.; Washburn, F.A.; MacDougall, C.S.

doi:10.1016/0921-4534(92)90462-l

Cited by 67 publications

(24 citation statements)

References 51 publications

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“…There have been several reports on the phase stability of 123 oxide under subatmospheric oxygen pressures [18,[23][24][25][26][27]. In particular, for pure 123, good agreements were found among the data reported by Lindemer et al [ 18 ], Idemoto and Fueki [25], and Kale [26].…”

Section: Resultsmentioning

confidence: 67%

Low-temperature melt growth of YBa2Cu3O7−x/silver composites in partial vacuum

Zern

Chen

1995

Physica C: Superconductivity

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Section: Resultsmentioning

confidence: 67%

Low-temperature melt growth of YBa2Cu3O7−x/silver composites in partial vacuum

Zern

Chen

1995

Physica C: Superconductivity

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“…The second endothermic reaction (see mark b) started at 935°C and its peak temperature was 940°C. This endothermic reaction is related to the eutectic melting of Ag [34]. The third endothermic peak (see mark c) which started at 980°C and peaked at 990°C is related to the melting of Y 123 containing Ag (Y 123-Ag) which corresponds to the production of the 2 11 phase with the decomposition of Y 123-Ag, i.e., Y 123- Temperature (Degrees C) Fig.…”

Section: Synthesis Of Y 123-ag Superconductor By Thermomechanical Trementioning

confidence: 97%

“…Ag -+ 21 l+L (with Ag) [34]. These temperatures (i.e., 980°C for melting of Y 123-Ag and 935°C for the eutectic temperature of the Ag-0) are close to the data in the literature which reported that at PO2 of 21.3 kPa (ambient air), the temperature at which Y123-Ag started melting, was -976°C [35] and the eutectic temperature of the Ag-0 was -950°C [36].…”

Section: Synthesis Of Y 123-ag Superconductor By Thermomechanical Trementioning

confidence: 99%

Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling

Lee¹,

Park

Lee

2000

Metals and Materials

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A highly homogeneous composite precursor containing nano-scale particles was synthesized from the highenergy attrition milling of a mixture of metallic Y, metallic Cu and barium nitrate (Ba(NO&) containing 5 wt.% silver. +0.325Ag. Y 123-Ag superconductors in powder or bulk forms were prepared using heat treatment or thermomechanical processing of the intermediate precursor containing BaCuO,,. The high oxygen orthorhombic Y 123-Ag phase (y>7) was obtained in quenched samples which were held for 30 min or less at 950 "C in ambient air. As the holding time extended to 40 min, the sample was still orthorhombic Y123-Ag (6.79 7). The transport critical current density (Jc) at 77 K and zero magnetic field for the quenched sample which was held for 40 min at 950°C was -1.3~10~ A/cm*.

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“…It is well known that highly oriented and high-quality epitaxial Y123 films are obtained when deposition and annealing are carried out near the equilibrium line and Y123-stability line in the oxygen partial pressure versus temperature diagram [8], [9]. Namely, in MOD process, -axis epitaxial Y123 films have been obtained by heat treatment at and , through precise control of and temperature.…”

Section: Introductionmentioning

confidence: 99%

Metal Organic Deposition of Epitaxial Y123 Films Using a Low-Cost Vacuum Technique

Yamaguchi

Manabe

Sohma

et al. 2005

IEEE Trans. Appl. Supercond.

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Epitaxial YBa 2 Cu 3 O 7 (Y123) films were obtained by metal-organic deposition (MOD) using a simple, low-cost vacuum technique without gas flowing. The total pressure and oxygen partial pressure in the furnace were controlled to be 10 kPa and 10 Pa, respectively, by evacuation with a rotary pump followed by refilling with a mixture of O 2 and N 2 (O 2 content: 1000 ppm). XRD analyses exhibited that -axis-oriented epitaxial Y123 films have successfully been obtained on CeO 2 -buffered YSZ (100) (CbZ) and CeO 2 -buffered sapphire (012) (CbS) substrates. In-plane alignments of these films were as high as that of the CeO 2 buffer layer. The film on the CbZ demonstrated a high critical current density c of 2 1 MA cm 2 at 77 K all over the film; the fluctuation of c being within 10% of the average. Inductive c measurement showed a very sharp peak with c = 90 5 K. Inductive-c and c of the Y123 film on CbS were 1.1 MA cm 2 and 89.6 K, respectively, whereas the c of the Y123 film on LaAlO 3 was lower than 77 K owing to the occurrence of the -axis grains.Index Terms-Critical current density, epitaxial Y123 film, metal-organic deposition, vacuum.

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Study of phase behavior in the YBa2Cu3O7−−BaCuO2+−CuO−Ag system

Cited by 67 publications

References 51 publications

Low-temperature melt growth of YBa2Cu3O7−x/silver composites in partial vacuum

Low-temperature melt growth of YBa2Cu3O7−x/silver composites in partial vacuum

Synthesis of yttrium barium copper oxide-0.325Ag superconductors via intermediate precursor with overall composition Y:Ba:Cu:0=l:2:3:Y, Y>7 produced by high-energy attrition milling

Metal Organic Deposition of Epitaxial Y123 Films Using a Low-Cost Vacuum Technique

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