Study of NbB2 Addition on the Superconducting Behavior of MgB2 Bulks

Due to its superconducting properties, MgB<sub>2</sub> materials are strategic for practical application as bulk, wire, tape, or cable. Recent work has shown that VB<sub>2</sub> additions introduce effective artificial pinning centers in the MgB<sub>2</sub> superconducting matrix, and an enhancement of its critical current density was observed. In this work we study the addition of NbB<sub>2</sub> in the production process of MgB<sub>2</sub> superconducting bulks and its influence on the superconducting behavior of the material. Different contents of additional NbB<sub>2</sub>, heat treatment profiles using continuous argon flux and hot isostatic pressing, different methods to compact the bulks, and their influences on the superconducting properties of MgB<sub>2</sub> are studied. As a result, the hot isostatic pressed samples reveal a denser and more homogeneous superconducting matrix. The addition of NbB<sub>2</sub> introduces randomly distributed clusters of NbB<sub>2</sub> in the MgB<sub>2</sub> superconducting matrix, which can act as effective artificial pinning centers.

[1]  E. Hellstrom,et al.  Artificial pinning centers in MgB2 superconducting bulks , 2020, Superconductor Science and Technology.

[2]  E. Hellstrom,et al.  The Influence of Stearic Acid Addition on the Superconducting Properties of MgB2 , 2016, IEEE Transactions on Applied Superconductivity.

[3]  D. Rodrigues,et al.  Study of TaB2 and SiC additions on the properties of MgB2 superconducting bulks , 2015 .

[4]  E. Hellstrom,et al.  MgB2 superconductors with addition of ZrB2 and different carbon sources , 2014 .

[5]  Saikat Das,et al.  Effect of graphene oxide doping on superconducting properties of bulk MgB2 , 2013 .

[6]  D. Rodrigues,et al.  ${\rm MgB}_{2}$ Superconductors With Addition of Other Diborides and SiC , 2011, IEEE Transactions on Applied Superconductivity.

[7]  V. Malik,et al.  The effect of carbon and rare earth oxide co-doping on the structural and superconducting properties of MgB2 , 2010 .

[8]  V. Malik,et al.  The effect of citric and oxalic acid doping on the superconducting properties of MgB2 , 2009 .

[9]  D. Larbalestier,et al.  Flux Pinning Optimization of ${\rm MgB}_{2}$ Bulk Samples Prepared Using High-Energy Ball Milling and Addition of ${\rm TaB}_{2}$ , 2009, IEEE Transactions on Applied Superconductivity.

[10]  K. Vinod,et al.  Significant enhancement of the in-field critical current density of the MgB2 superconductor through codoping of nano-TiC with nano-SiC , 2009 .

[11]  S. Dou,et al.  SiC and Carbon Nanotube Distinctive Effects on the Superconducting Properties of Bulk MgB2 , 2008 .

[12]  Shi Xue Dou,et al.  Carbohydrate doping to enhance electromagnetic properties of MgB2 superconductors , 2006 .

[13]  K. Kishio,et al.  Effects of B4C doping on critical current properties of MgB2 superconductor , 2005 .

[14]  H. Kitaguchi,et al.  Effect of aromatic hydrocarbon addition on in situ powder-in-tube processed MgB2 tapes , 2005, cond-mat/0509086.

[15]  M. Kilburn,et al.  Chemical interactions in Ti doped MgB2 superconducting bulk samples and wires , 2005 .

[16]  R. S. Tiwari,et al.  Effect of La doping on microstructure and critical current density of MgB2 , 2005, cond-mat/0507083.

[17]  S. Dou,et al.  High transport critical current density and large Hc2 and Hirr in nanoscale SiC doped MgB2 wires sintered at low temperature , 2005 .

[18]  M. Bhatia,et al.  Increases in the irreversibility field and the upper critical field of bulk MgB2 by ZrB2 addition , 2005, cond-mat/0503758.

[19]  S. Haigh,et al.  Improvement of the current carrying capability of ex situ MgB2 wires by normal particle additions , 2004 .

[20]  M. Uehara,et al.  La-doping effects on pinning properties of MgB2 , 2004 .

[21]  Gaojie Xu,et al.  Superconducting properties of Zn and Al double-doped Mg1−x(Zn0.5Al0.5)xB2 , 2004 .

[22]  M. Murakami,et al.  Improvement of critical current density in MgB2 by Ti, Zr and Hf doping , 2003 .

[23]  Y. Yamada,et al.  Structure and critical current of Ni-sheathed PIT MgB2 tapes with In metal powder addition , 2003 .

[24]  Y. Yamada,et al.  Effects of metal powder addition on the structure and critical current of Ni-sheathed PIT MgB/sub 2/ tapes , 2003 .

[25]  H. Hatakeyama,et al.  Improvement of critical current density in Fe-sheathed MgB2 tapes by ZrSi2, ZrB2 and WSi2 doping , 2003, cond-mat/0306652.

[26]  Jena,et al.  High-pressure synthesis of MgB2 with addition of Ti , 2003, cond-mat/0306013.

[27]  S. Dou,et al.  Effect of Ti Doping on the Superconductivities of MgB2/Fe Wires , 2003 .

[28]  X. H. Liu,et al.  Microstructures and superconducting properties in Ti-doped MgB2/Ta/Cu tape , 2003 .

[29]  P. Canfield,et al.  CVD routes to MgB2 conductors , 2003, cond-mat/0302242.

[30]  Jr.,et al.  Titanium additions to MgB2 conductors , 2003, cond-mat/0302245.

[31]  X. H. Liu,et al.  High critical current density in Ti-doped MgB2/Ta/Cu tape by powder-in-tube process , 2002 .

[32]  M. Murakami,et al.  Doping effect of Zr and Ti on the critical current density of MgB2 bulk superconductors prepared under ambient pressure , 2002 .

[33]  M. Murakami,et al.  Enhanced flux pinning in Zr-doped MgB2 bulk superconductors prepared at ambient pressure , 2002 .

[34]  S. Dou,et al.  Substitution-induced pinning in MgB2 superconductor doped with SiC nano-particles , 2002, cond-mat/0206444.

[35]  M. Murakami,et al.  Nanoparticle structure of MgB2 with ultrathin TiB2 grain boundaries , 2002 .

[36]  M. Murakami,et al.  Enhancement of critical current density in MgB2 bulk superconductor by Ti doping , 2002 .

[37]  M. Murakami,et al.  Improvement of critical current density in MgB2 superconductors by Zr doping at ambient pressure , 2001 .

[38]  R. Cava.  Loss of Superconductivity with the Addition of Al to MgB2 and a Structural Transition in Mg1-xAlxB2. , 2001 .

[39]  A. Palenzona,et al.  Magnetic characterization of sintered MgB2 samples: effect of substitution or 'doping' with Li, Al and Si , 2001, cond-mat/0105212.

[40]  L. Schultz,et al.  Upper critical field and irreversibility line in superconducting MgB2 , 2001, cond-mat/0104088.

[41]  M. Sato,et al.  Simple and approximate expressions of demagnetizing factors of uniformly magnetized rectangular rod and cylinder , 1989 .

[42]  C. P. Bean.  Magnetization of hard superconductors , 1962 .

[43]  E. Hellstrom,et al.  Superconducting Properties of MgB2 with Addition of Other AlB2–type Diborides and Carbon Sources, Prepared Using High Energy Ball Milling and HIP , 2012 .

[44]  马衍伟.  Phthalocyanine doping to improve critical current densities in MgB2 tapes , 2009 .

[45]  渡邉 和雄.  Improved critical current densities in MgB2 tapes with ZrB2 doping , 2006 .