Effect of B2O3 addition on the formation and properties of Tl-2212 and Tl-2223 superconductors

Çavdar, Şükrü; Koralay, Haluk; Özkan, H.; Gasanly, Nizami; Ercan, I.

doi:10.1002/pssa.200306661

Cited by 9 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to what was reported by Sykorova et al [55], who observed partial B substitution for Cu, Cavdar et al [44] revealed the formation of different B-containing phases in the form of clusters evenly distributed over the superconducting matrix and acting as additional pinning sites. In spite of the partial substitution of B for Cu, B is classed with inert additions because it is B-containing inclusions in the form of clusters which ensure j c enhancement.…”

Section: Chemical Means Of Producing Pinning Sitescontrasting

confidence: 61%

“…Elemental impurities such as Zn, Ho, and Gd, as well as many compound impurities, suppress superconductivity in microvolumes [42][43][44], which then act as additional pinning sites, enhancing j c , in particular that in high magnetic fields. In spite of the intense research effort concentrated on the influence of structural defects, such as vacancies and second-phase inclusions, on the pinning mechanism in superconductors, the possibility of enhancing flux pinning using impurities has not yet been investigated in sufficient detail.…”

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

“…Cavdar et al [44] investigated the effect of B 2 O 3 additions on the properties of Tl-2212 and Tl-2223, using samples prepared from Tl 2 O 3 , BaO 2 , CaO, and CuO by solid-state reactions. According to their results, small (<1.2 wt %) B 2 O 3 additions improve the mechanical properties of the material and increase the percentages of the 2212 and 2223 phases.…”

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

See 2 more Smart Citations

Physicochemical methods of enhancing the performance of high-Tc superconductors

2004

View full text Add to dashboard Cite

Experimental data are summarized on the optimization of the performance of YBa 2 Cu 3 O 7x , Bi 2 Sr 2 CaCu 2 O 8 + δ , and (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 + δ high-T c ceramics by producing structural defects via irradiation or doping with metals and different inorganic compounds. A classification of additions is proposed according to their interaction with the superconductors. For additions having an advantageous effect on the superconducting and mechanical properties of the high-T c materials, the optimum concentration and size ranges are indicated. S92 INORGANIC MATERIALS Vol. 40 Suppl. 2 2004 MIKHAILOV et al .c ^ s ^ z ^

show abstract

Section: Chemical Means Of Producing Pinning Sitescontrasting

confidence: 61%

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

See 1 more Smart Citation

Physicochemical methods of enhancing the performance of high-Tc superconductors

2004

View full text Add to dashboard Cite

show abstract

“…Small amounts of B 2 O 3 are also effective to improve the texture, density and mechanical strengths of BSCCO [2,3,5]. Studies of our group on the Tl-based superconductors (TBCCO) indicate that about 1.0 wt% B 2 O 3 is effective for the formations of the Tl-2212 and Tl-2223 phases [6,7]. However, excessive amounts of B 2 O 3 degrade the superconductivity of the Bi-and Tl-based compounds [2-4, 6, 7].…”

Section: Introductionmentioning

confidence: 97%

“…We have studied the effects of boron and lithium additions on the properties of HTSs [7,10]. Recently, we have grown B 2 O 3 added 123 samples having 211 particles with the melt powder melt growth method (MPMG) and published the effects of thermal neutron irradiation on their critical parameters [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of B₂O₃ addition on the properties of melt-processed YBa₂Cu₃O_7−δ

Topal

Özkan

2004

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Samples of YBa2Cu3O7−δ, having about 30% Y2BaCuO5, were prepared with a melt-process method by adding B2O3 up to 0.5 wt% to the oxides. The structural and superconducting properties of the samples were studied by x-ray diffraction, x-ray fluorescence, scanning electron microscope, magnetization and magneto-optic techniques. B2O3 additions during the melt-processing enlarge intergrain regions that weaken the conduction links between the grains. Tc drops by 1.0–6.0 K, and at 50 K Jc decreases from about 1.6 × 104 to 1.8 × 103 A cm−2 with B2O3 additions up to 0.5 wt%. A secondary peak was observed in the Jc versus field plot of the boron-free sample that decreases with boron additions. At 50 K the intragrain Jc values of the boron-free sample were about 12% higher than the intergrain Jc value, and such differences increase with B2O3 additions. These observations, together with the enlargements of the intergrain regions with B2O3 additions, suggest that most of the boron atoms take part and reside at grain boundaries.

show abstract