The Effect of Inhomogeneous Phase on the Critical Temperature of Smart Meta-superconductor MgB2

Chen, Honggang; Li, Yongbo; Chen, Guowei; Xu, Longxuan; Zhao, Xiaopeng

doi:10.1007/s10948-018-4599-6

Cited by 14 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, similar experimental results were obtained by replacing Y 2 O 3 :Eu 3+ with Y 3 VO 4 :Eu 3+ flakes 46 . Meanwhlie, results also indicated that the T C can be changed by adjusting the Y 2 O 3 :Eu 3+ concentration and EL exciting current 47 . However, there are some problems need to improve in the experiments.…”

Section: Introductionmentioning

confidence: 89%

“…However, there are some problems need to improve in the experiments. Y 2 O 3 :Eu 3+ particles or flakes tended to agglomerate during the preparation process and its EL intensity was weak 44–47 . The quality of commercial MgB 2 was poor and its superconducting transition width ( ΔT ) is 4.6 K 46,47 , further experiment and improvement will be needed.…”

Section: Introductionmentioning

confidence: 99%

“…Y 2 O 3 :Eu 3+ particles or flakes tended to agglomerate during the preparation process and its EL intensity was weak 44–47 . The quality of commercial MgB 2 was poor and its superconducting transition width ( ΔT ) is 4.6 K 46,47 , further experiment and improvement will be needed. Moreover, the dopants would decrease the T C in the case of double dopants, i.e., simultaneous incorporation of Y 2 O 3 :Eu 3+ and nano-Ag into MgB 2 47 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Chen

Wang

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

On the basis of the idea that the injecting energy will improve the conditions for the formation of Cooper pairs, a smart meta-superconductor (SMSC) was prepared by doping luminescent nanocomposite Y2O3:Eu3+/Ag in MgB2. To improve the superconducting transition temperature (TC) of the MgB2-based superconductor, two types of Y2O3:Eu3+/Ag, which has the strong luminescence characteristic, with different sizes were prepared and marked as m-Y2O3:Eu3+/Ag and n-Y2O3:Eu3+/Ag. MgB2 SMSC was prepared through an ex situ process. Results show that when the dopant content was fixed at 2.0 wt.%, the TC of MgB2 SMSC increased initially then decreased with the increase in the Ag content in the dopant. When the Ag content is 5%, the TC of MgB2 SMSC was 37.2–38.0 K, which was similar to that of pure MgB2. Meanwhile, the TC of MgB2 SMSC doped with n-Y2O3:Eu3+/Ag increased initially then decreased basically with the increase in the content of n-Y2O3:Eu3+/Ag, in which the Ag content is fixed at 5%. The TC of MgB2 SMSC doped with 0.5 wt.% n-Y2O3:Eu3+/Ag was 37.6–38.4 K, which was 0.4 K higher than that of pure MgB2. It is thought that the doping luminescent nanocomposite into the superconductor is a new means to improve the TC of SMSC.

show abstract

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Chen

Wang

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The external field added during the measurement of the T c of SMSC with a four-probe method can excite the inhomogeneous phases to generate EL, achieving the purpose of strengthening the Cooper pairs, resulting the change of T c in macroscopic. A SMSC is a material whose T c can be adjusted and improved by the stimulus of external field, which is a new property and cannot be achieved by traditional doping with a second phase [ 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Our group subsequently conducted a series of studies, mainly using MgB 2 as the base superconducting material and Y 2 O 3 :Eu 3+ as the base EL material [ 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Reinforcing Increase of ΔTc in MgB2 Smart Meta-Superconductors by Adjusting the Concentration of Inhomogeneous Phases

Han

Zou

et al. 2021

Materials

Self Cite

View full text Add to dashboard Cite

Incorporating with inhomogeneous phases with high electroluminescence (EL) intensity to prepare smart meta-superconductors (SMSCs) is an effective method for increasing the superconducting transition temperature (Tc) and has been confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of ΔTc (ΔTc = Tc ‒ Tcpure) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB2 raw materials, namely, aMgB2, bMgB2, and cMgB2, were prepared with particle sizes decreasing in order. Inhomogeneous phases, Y2O3:Eu3+ and Y2O3:Eu3+/Ag, were also prepared and doped into MgB2 to study the influence of doping concentration on the ΔTc of MgB2 with different particle sizes. Results show that reducing the MgB2 particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing ΔTc. The optimal doping concentrations for aMgB2, bMgB2, and cMgB2 are 0.5%, 0.8%, and 1.2%, respectively. The corresponding ΔTc values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of ΔTc in MgB2 SMSCs.

show abstract

“…The results showed that the doping of Y 2 O 3 :Eu 3+ EL materials increases the T C of MgB 2 . We believe that the Y 2 O 3 :Eu 3+ materials generate an EL under the action of an external electric field and that EL energy injection promotes the formation of Cooper pairs; the T C of MgB 2 is improved via EL [ 35 , 36 , 37 , 38 , 39 ]. At the same time, a smart meta-superconductor B(P)SCCO consists of the B(P)SCCO matrix and an inhomogeneous phase Y 2 O 3 :Eu 3+ or Y 2 O 3 :Eu 3+ +Ag was constructed in BSCCO superconductors.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the TC of Smart Meta-Superconductor Bi(Pb)SrCaCuO and Inhomogeneous Phase Content

Chen

Wang

et al. 2021

Nanomaterials

Self Cite

View full text Add to dashboard Cite

A smart meta-superconductor Bi(Pb)SrCaCuO (B(P)SCCO) may increase the critical transition temperature (TC) of B(P)SCCO by electroluminescence (EL) energy injection of inhomogeneous phases. However, the increase amplitude ΔTC (ΔTC=TC−TC,pure) of TC is relatively small. In this study, a smart meta-superconductor B(P)SCCO with different matrix sizes was designed. Three kinds of raw materials with different particle sizes were used, and different series of Y2O3:Sm3+, Y2O3, Y2O3:Eu3+, and Y2O3:Eu3++Ag-doped samples and pure B(P)SCCO were prepared. Results indicated that the TC of the Y2O3 or Y2O3:Sm3+ non-luminescent dopant doping sample is lower than that of pure B(P)SCCO. However, the TC of the Y2O3:Eu3++Ag or Y2O3:Eu3+ luminescent inhomogeneous phase doping sample is higher than that of pure B(P)SCCO. With the decrease of the raw material particle size from 30 to 5 μm, the particle size of the B(P)SCCO superconducting matrix in the prepared samples decreases, and the doping content of the Y2O3:Eu3++Ag or Y2O3:Eu3+ increases from 0.2% to 0.4%. Meanwhile, the increase of the inhomogeneous phase content enhances the ΔTC. When the particle size of raw material is 5 μm, the doping concentration of the luminescent inhomogeneous phase can be increased to 0.4%. At this time, the zero-resistance temperature and onset transition temperature of the Y2O3:Eu3++Ag doped sample are 4 and 6.3 K higher than those of pure B(P)SCCO, respectively.

show abstract

The Effect of Inhomogeneous Phase on the Critical Temperature of Smart Meta-superconductor MgB2

Abstract: of the luminescent inhomogeneous phase doping samples increased and then decreased as increasing current.Keywords smart meta-superconductor MgB2 · Y2O3:Eu 3+ nanosheets · Inhomogeneous phase·Applied electric field·TC

Cited by 14 publications

References 29 publications

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Reinforcing Increase of ΔTc in MgB2 Smart Meta-Superconductors by Adjusting the Concentration of Inhomogeneous Phases

Relationship between the TC of Smart Meta-Superconductor Bi(Pb)SrCaCuO and Inhomogeneous Phase Content

Contact Info

Product

Resources

About