Li and Ce doping of melt-textured YBCO: Improved jc at medium fields

Horvath, Daniel; Harnois, Christelle; Noudem, Jacques

doi:10.1016/j.mseb.2008.02.013

Cited by 5 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yttrium-barium-copper-oxide, YBCO is the first type-II high temperature superconductor (HTS) that has been discovered to be superconducting above the boiling point of liquid nitrogen. Among the family members of YBCO, 123 phase (Y-123) shows the highest onset of superconductivity at around 90 K. In order for Y-123 to be more feasible for a wide range of applications, numerous studies have been undertaken to improve its critical temperature, T c and critical current density, J c [1][2][3]. In this regard, addition of chemical dopants is one of the most straight forward strategies.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

View full text Add to dashboard Cite

Polycrystalline samples of YBa2Cu3O7−δ (Y-123) added with x mol% of BaZrO3 (BZO) nanoparticles (x = 0.0, 2.0, 5.0, and 7.0) were synthesized using co-precipitation (COP) and solid-state (SS) method. X-ray diffraction (XRD) patterns showed the formation of Y-123 and Y-211 as the major and minor phases, respectively. The samples prepared using COP method showed higher weight percentage of Y-123 phase (≤98%) compared to the SS samples (≤93%). A peak corresponding to BZO was also found in the samples added with BZO nanoparticles. The increasing intensity of the BZO peak as the BZO amount increased showed the increasing amount of the unreacted nanoparticles in the samples. Refinement of unit cell lattice parameters indicated that all the samples have an orthorhombic crystal structure and there is no orthorhombic-tetragonal phase transformation. As observed using scanning electron microscopy (SEM), all the samples showed randomly distributed grains with irregular shape. The average grain size for the pure sample prepared using COP method is smaller (0.30 µm) compared with that of the pure SS sample (1.24 µm). Addition of 7.0 mol% BZO led to an increase of average grain size to 0.50 μm and 2.71 μm for the COP and SS samples, respectively, indicating grain growth. AC susceptibility (ACS) measurement showed a decrease in the onset critical temperature, Tc-onset with BZO addition. Comparatively, Tc-onset for the COP samples is higher than that of the SS samples. The value of Josephson’s current, Io increased up to 2.0 mol% BZO addition, above which the Io decreased more drastically for the SS samples. The value of Io is 53.95 μA and 32.08 μA for the 2.0 mol% BZO added SS and COP samples, respectively. The decrease of Io is attributed to the distribution of BZO particles at the grain boundaries as also reflected in the drastic decrease of phase lock-in temperature, Tcj. As a result of smaller average grain size, the presence of more grain boundaries containing insulating BZO particles led to lower Io in the COP samples.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

View full text Add to dashboard Cite

show abstract

“…On the other hand, for fundamental studies and practical applications, large size and high‐quality Y123 single crystals have been highly requested toward and provided from our crystal growth laboratory, achieving excellent collaborative work recently . Furthermore, the cationic substitution in the Y123 system has been paid more and more attention by researchers owing to its distinctive role in revealing the superconductivity mechanism and in developing the superconductor devices . Different kinds of doping elements have their distinct characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20][21][22][23][24] Furthermore, the cationic substitution in the Y123 system has been paid more and more attention by researchers owing to its distinctive role in revealing the superconductivity mechanism and in developing the superconductor devices. [25][26][27][28][29] Different kinds of doping elements have their distinct characteristics. For instance, the Fe substitution on the Cu site has an obvious reduction in superconducting critical transition temperature (T c ) of approximately 6 K/at.%.…”

Section: Introductionmentioning

confidence: 99%

Almost complete peritectic reaction in YBa₂(Cu_1−xFe_x)₃O_7−δ crystallization involving nanosized primary phase

Qian

Fan

et al. 2017

J Am Ceram Soc

View full text Add to dashboard Cite

Study on peritectic reaction is a matter of significant importance in materials science, which generally involves in the solidification of most functional oxide materials, for example, the YBa2Cu3O7−δ (Y123) superconductor could be grown via a reaction of Y2BaCuO5 (Y211) + Liquid→Y123. Due to its crystallization characteristic, the growth of those materials does not entirely proceed, which severely impedes the development of industrialized process. Thus the realization of a complete peritectic reaction is an interesting issue for both theory and experiment. Here, we report an almost complete peritectic reaction occurring in the growth of YBa2(Cu1−xFex)3O7−δ crystals using modified melt‐growth. Our findings remarkably show that Y211 almost fully reacted with liquid to generate Y123, remaining approximately 1 vol%, evidently lower than that in the normal case. The nature of this unconventional phenomenon is clarified that the Fe‐doping elevates the nucleation barrier in the peritectic melting of Y123 and causes a massive homogeneous nucleation catastrophe, leading to nanosized and dispersive Y211 particles, which readily and almost fully dissolve in the subsequent peritectic solidification of Y123. Most importantly, the new conception derived from this work is promising for reviving other functional materials, which are disregarded due to their incomplete peritectic reactions.

show abstract

Effect of alkali metal carbonate A2CO3 (A = Li, Na, K) on AC susceptibility and superconducting properties of YBa2Cu3O7−δ

et al. 2019

View full text Add to dashboard Cite

Li and Ce doping of melt-textured YBCO: Improved jc at medium fields

Cited by 5 publications

References 15 publications

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Almost complete peritectic reaction in YBa₂(Cu_1−xFe_x)₃O_7−δ crystallization involving nanosized primary phase

Effect of alkali metal carbonate A2CO3 (A = Li, Na, K) on AC susceptibility and superconducting properties of YBa2Cu3O7−δ

Contact Info

Product

Resources

About

Li and Ce doping of melt-textured YBCO: Improved jc at medium fields

Cited by 5 publications

References 15 publications

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Almost complete peritectic reaction in YBa2(Cu1−xFex)3O7−δ crystallization involving nanosized primary phase

Effect of alkali metal carbonate A2CO3 (A = Li, Na, K) on AC susceptibility and superconducting properties of YBa2Cu3O7−δ

Contact Info

Product

Resources

About

Almost complete peritectic reaction in YBa₂(Cu_1−xFe_x)₃O_7−δ crystallization involving nanosized primary phase