Phase diagram and microstructure in the system CuO-PbO-Ag

Liu, H. K.; Dou, Shi Xue; Shao, Zhongbao; Liu, K. R.; Liu, L. Q.

doi:10.1007/bf00730371

Cited by 2 publications

(2 citation statements)

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“…After both the samples had been sintered at 830 • C for 50 or 200 h, SEM/EDAX was used to determine the microstructure and composition of fractured longitudinal cross sections. Figures 6(a Based on the result in [12], we think that the process of 2223 phase formation can be illustrated in figure 7; that is, it is due to the easy formation of liquid phase at the Ag/oxide interface [4,7,8], the 2223 phase preferably nucleates and grows at the Ag/oxide interface and thereby a layer parallel to the silver layer including the 2223 phase (termed the '2223 layer') is formed, then the '2223 layer' advances towards the core of the oxide layer in a face-toface fashion to minimize interface energy by transition of the 2212 to the 2223 phase, at the same time, the volume of the 2223 phase is increased in the '2223 layer'. Then two categories of new interface appear, one is the Ag/2223 interface, another is the 2223/oxide layer.…”

Section: The Effect Of a Silver Layer On 2223 Phase Formationmentioning

confidence: 99%

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The effect of the configuration of the silver layer on texture growth and microstructure in silver-sheathed superconducting tape

Mao

Zhou

Sung

et al. 1996

Supercond. Sci. Technol.

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Silver-sheathed (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O x (2223) tapes with different configurations of silver layer have been prepared to investigate the effect of the silver layer on texture growth and microstructure of the 2223 phase by x-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDAX). It has been shown that the whole silver layers, both lateral and broad layers, significantly enhance texture growth of the 2223 phase. The new understanding of the mechanistic role of the silver layer in texture growth has been presented, based on the high solubility of oxygen in silver and the greater ability of silver with respect to adsorption of oxygen. The silver layer is thought to supply both a fast out-diffusion path for oxygen formed during the transition from the 2212 phase to the textured 2223 phase and a favourable configuration for texture growth of the 2223 phase.

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Section: The Effect Of a Silver Layer On 2223 Phase Formationmentioning

confidence: 99%

“…(iv) There exists a low eutectic point in the Ag-BiPbSrCaCuO system and the existence of silver reduces the melting point of the composite tape by about 10-15 • C [7,8].…”

Section: Introductionmentioning

confidence: 99%