The effect of mechanical deformation on the phase transformation of BSCCO superconductors

Li, S.; Gao, Wei; Cooper, H; Liu, H.K.; Dou, Shi Xue

doi:10.1016/s0921-4534(01)00161-7

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…For both types of processing techniques, RTP and CP, a decrease in the Bi2223 phase content at intermediate deformation ratios can be seen (figures 1 and 2). This trend is similar to that found in studies by Li [22] and Vo et al [23], who all studied the phase transformation of rolled tapes. In general the CP samples show a better Bi2223 content, in comparison to the RTP, over each time period and deformation ratio.…”

Section: Resultssupporting

confidence: 91%

“…The phase transformation characteristics of the pressed samples are similar to those of identical rolled tapes [22], although the pressed tapes have a better Bi2223 phase content. Therefore, a similar explanation for the behaviour can be given.…”

Section: Discussionmentioning

confidence: 71%

“…Many of the studies have been based on the relation between the phase transformation process and the composition, atmosphere, temperature or time [14][15][16][17][18][19][20]. However, only a limited amount of study has been done concerning the effect of deformation on the transformation process [22,23]. The current work involved two different processing techniques.…”

Section: Introductionmentioning

confidence: 99%

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Phase transformation characteristics of BSCCO tapes processed via cryogenic and room temperature pressing

Cooper

Gao

et al. 2001

Supercond. Sci. Technol.

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The current investigation studies the phase transformation process of Bi-Sr-Ca-Cu-O (BSCCO) tapes processed by cryogenic, 77 K and room temperature pressing. The work specifically examined the effect of deformation on the phase content and transformation kinetics of the BSCCO tapes. The results showed that cryogenic pressing produced tapes with a higher Bi2223 phase content at lower deformation ratios than room temperature pressed tapes. However, the phase transformation profiles for both tapes were similar. A minimum phase content was observed in the profiles that was characteristic to each process. The minimum occurred between 30-40% deformation for the cryogenically pressed tapes and between 50-60% for the room temperature pressed tapes. The peculiar profiles were suggested to be the result of two competing mechanisms that reduced the free energy of the systems. It was suggested that these two mechanisms were either Bi2212 re-crystallization or Bi2223 phase formation. The differences observed between the two processes were attributed to the amount and way in which the deformation energy was transferred to the tape.

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Section: Resultssupporting

confidence: 91%

Section: Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Phase transformation characteristics of BSCCO tapes processed via cryogenic and room temperature pressing

Cooper

Gao

et al. 2001

Supercond. Sci. Technol.

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“…Therefore, the evaluation of mechanical properties of superconductors is important for their practical applications. Due to this importance, many workers have studied on mechanical properties (flexural strength [3], tensile strength, microhardness, and elastic modulus [4][5][6][7][8][9][10][11][12][13][14][15][16]) of superconductors. Among the superconductors, however, there are a few works on the mechanical properties of Bi-based (BSCCO) superconductors [3,6,8,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effects of ZnO addition on mechanical properties of Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10 prepared by a wet technique

Karaca

Uzun

Kölemen

et al. 2009

Journal of Alloys and Compounds

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“…Konishi et al (Konishi, Takamura, Kaga, & Katsuse, 1989) proposed the alginate method for the fabrication of superconducting oxide ceramic fibers. Y-Ba-Cu-O superconducting fibers have shown a tensile strength of 192 MPa and an end-point T c of 85 K. Li et al (Li, Gao, Cooper, Liu, & Dou, 2001) investigated the effects of mechanical deformation on the kinetics of the Bi-2212 to Bi-2223 phase transformation. It was shown that the increase in the mechanical deformation provides high internal energy, which enhances the formation of Bi-2223 phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

Habanjar¹,

Hassan²,

Awad³

2019

MAS

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The aim of this work is to investigate the effect of BaFe12O19 nanoparticles on the microstructure, phase formation and mechanical properties of (Bi,Pb)-2223 superconducting phase. Co-precipitation and solid-state reaction techniques were used to synthesize BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 superconducting samples with , respectively. BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 structures were performed using X-ray diffraction. The morphology of BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 were observed by means of transmission electron microscope (TEM) and scanning electron microscope (SEM), respectively. The experimental results reveal the composition of Bi-2223 phase and traces of Bi-2212 as a secondary phase when compared to the undadded sample. Lattice parameters are not altered with BaFe12O19 addition which indicate that nanoparticles do not enter the host crystal of (Bi,Pb)-2223. Vickers microhardness Hv is measured as function of indentation load and time. It was found that microhardness has a non-linear trend with applied load and time. The experimental results were analyzed using different models. The analysis revealed that the HK model was more suitable than the other approaches in estimating the load independent hardness of the samples.

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The effect of mechanical deformation on the phase transformation of BSCCO superconductors

Cited by 4 publications

References 10 publications

Phase transformation characteristics of BSCCO tapes processed via cryogenic and room temperature pressing

Phase transformation characteristics of BSCCO tapes processed via cryogenic and room temperature pressing

Effects of ZnO addition on mechanical properties of Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10 prepared by a wet technique

Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

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