Photoelectron spectroscopic investigation of transformation of trifluoroacetate precursors into superconducting YBa2Cu3O7−δ films

Su, Jianhua; Joshi, Pratik; Chintamaneni, V.; Mukhopadhyay, Sharmila M.

doi:10.1016/j.apsusc.2006.10.018

Cited by 14 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, during deconvolution of the O 1s spectrum, it should be also taken into account that dysprosium oxide has the oxygen peak at 529.3 [15]. At the same time in the O 1s and Ba 3d spectra one can see slight peaks at 528.8 and 777.7 eV which we interpret as a contribution of the main phase (shown by tinting) due to the proximity of the binding energy of corresponding peaks in the compounds YBa 2 Cu 3 O 6+ and NdBa 2 Cu 3 O 6+ [11,[16][17][18][19]. To allocate the DyBa 2 Cu 3 O 6+ contributions in the Cu 2p and Dy 3d spectra is not possible.…”

Section: Dyba 2 Cu 3 O 6+mentioning

confidence: 71%

XPS study of the chemical stability of DyBa2Cu3O6+δ superconductor

Фетисов

Кожина

Эстемирова

et al. 2015

Physica C: Superconductivity and its Applications

View full text Add to dashboard Cite

The chemical stability of the powder DyBa 2 Cu 3 O 6+ has been studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and thermal analysis at ambient conditions. The powder was subjected to mechanical processing in a ball mill-activator to accelerate chemical degradation. The kinetic regularities of hydrolytic decomposition of DyBa 2 Cu 3 O 6+ under the influence of air moisture have been determined. The resistive properties of DyBa 2 Cu 3 O 6+ to water have been found to be better, but not much different from analogous properties of YBa 2 Cu 3 O 6+ which is unstable in a wet environment. Chemical degradation of the material is triggered by crucial concentrating of water particles near the free surface of the solid reactant (due to their low diffusibility in the bulk) leading to rapid chemical decomposition of the respective regions.

show abstract

Section: Dyba 2 Cu 3 O 6+mentioning

confidence: 71%

XPS study of the chemical stability of DyBa2Cu3O6+δ superconductor

Фетисов

Кожина

Эстемирова

et al. 2015

Physica C: Superconductivity and its Applications

View full text Add to dashboard Cite

show abstract

“…The binding energy value decreases to 933.2 eV for the sample after 35 min irradiation. This indicates that the coordinate bond between Cu ion and hydroxy oxygen atom of AA is broken, the binding energy of Cu2p 3/2 decreases by 0.6 eV, which corresponds to Cu(CH 3 COO) 2 [9]. The hydroxy oxygen atom of AA gains electrons, the binding energy of O1s decreases.…”

Section: Methodsmentioning

confidence: 88%

Preparation of the photosensitive copper complex and CuO film pattern

Zhang

Zhao

2013

Applied Surface Science

View full text Add to dashboard Cite

“…Detailed analyses at every step of the heating process are explained in earlier publications. 10,11 The comparison of the calcined films (which clearly differentiates the intermediate phases for the two precursors) is shown here. Figure 5 shows the comparative XPS spectra of Y 3d, Ba 3d, and Cu 2p obtained from the samples after calcination using the nanoparticle and the conventional TFA-MOD processes.…”

Section: Xps Investigationmentioning

confidence: 99%

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Mukhopadhyay

Chintamaneni

2007

Journal of Elec Materi

Self Cite

View full text Add to dashboard Cite

Detailed investigation of superconducting films of YBa 2 Cu 3 O 7-d (YBCO) prepared from solution-based precursors have been performed. Two precursors have been compared in this study: the presently used trifluoroacetate (TFA) solution and a recently developed colloidal suspension containing nanoparticles of mixed oxide. Detailed analyses of the evolution of microstructure and chemistry of the films have been performed, and process parameters have been correlated with final superconducting properties. Both films need two heating steps: a low temperature calcination and a higher temperature crystallization step. For TFA films, it was seen that the heating rate during calcination needs to be carefully optimized and is expected to be slow. For the alternate process using a nanoparticle precursor, a significantly faster calcination rate is possible. In the TFA process, the Ba ion remains as fluoride and the Y remains as oxyfluoride after calcination. This implies that, during the final crystallization stage to form YBCO, fluorine-containing gases will evolve, resulting in residual porosity. On the other hand, the film from the nanoparticle process is almost fully oxidized after calcination. Therefore, no gases evolve at the final firing (crystallization) stage, and the film has much lower porosity. The superconducting properties of both types of films are adequate, but the nanoparticle films appear to have persistently higher J c values. Moreover, they show improved flux pinning in higher magnetic fields, probably due to nanoscale precipitates of a Cu-rich phase. In addition, the nanocolloid films seem to show additionally enhanced flux pinning when doped with minute amounts of second phase precipitates. It therefore appears that, whereas the TFA process is already quite successful, the newly developed nanoparticle process has significant scope for additional improvement. It can be scaled-up with ease, and can be easily adapted to incorporate nanoscale flux pinning defects for in-field performance.

show abstract

Photoelectron spectroscopic investigation of transformation of trifluoroacetate precursors into superconducting YBa2Cu3O7−δ films

Cited by 14 publications

References 22 publications

XPS study of the chemical stability of DyBa2Cu3O6+δ superconductor

XPS study of the chemical stability of DyBa2Cu3O6+δ superconductor

Preparation of the photosensitive copper complex and CuO film pattern

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

Contact Info

Product

Resources

About