Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride

T. A. Prikhna; W. Gawalek; V. M. Tkach; N. I. Danilenko; Ya M. Savchuk; S. N. Dub; V. E. Moshchil; A. V. Kozyrev; N. V. Sergienko; M. Wendt; V. S. Melnikov; J. Dellith; H. Weber; M. Eisterer; Ch Schmidt; T. Habisreuther; D. Litzkendorf; J. Vajda; A. P. Shapovalov; V. Sokolovsky; P. A. Nagorny; V. B. Sverdun; J. Kosa; F. Karau; A. V. Starostina

doi:10.1088/1742-6596/234/1/012031

Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride

T. A. Prikhna, W. Gawalek, V. M. Tkach, N. I. Danilenko, Ya M. Savchuk, S. N. Dub, V. E. Moshchil, A. V. Kozyrev, N. V. Sergienko, M. Wendt, V. S. Melnikov, J. Dellith, H. Weber, M. Eisterer, Ch Schmidt, T. Habisreuther, D. Litzkendorf, J. Vajda, A. P. Shapovalov, V. SokolovskyP. A. Nagorny, V. B. Sverdun, J. Kosa, F. Karau, A. V. Starostina

Department of Physics

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Abstract

The effect of doping with Ti, Ta, SiC in complex with synthesis temperature on the amount and distribution of structural inhomogeneities in MgB₂ matrix of high-pressure-synthesized-materials (2 GPa) which can influence pinning: higher borides (MgB₁₂) and oxygen-enriched Mg-B-O inclusions, was established and a mechanism of doping effect on j_c increase different from the generally accepted was proposed. Near theoretically dense SiC-doped material exhibited j_c= 10⁶ A/cm ² in 1T field and H_irr =8.5 T at 20 K. The highest jc in fields above 9, 6, and 4 T at 10, 20, and 25 K, respectively, was demonstrated by materials synthesized at 2 GPa, 600 °C from Mg and B without additions (at 20 K j_c= 10² A/cm² in 10 T field). Materials synthesized from Mg and B taken up to 1:20 ratio were superconductive. The highest j_c (6×10⁴ A/cm² at 20 K in zero field, H_irr= 5 T) and the amount of SC phase (95.3% of shielding fraction), T_c being 37 K were demonstrated by materials having near MgB₁₂ composition of the matrix. The materials with MgB₁₂ matrix had a doubled microhardness of that with MgB₂ matrix (251.1 GPa and 13.081.07 GPa, at a load of 4.9 N, respectively).

Original language	English
Article number	012031
Journal	Journal of Physics: Conference Series
Volume	234
Issue number	PART 1
DOIs	https://doi.org/10.1088/1742-6596/234/1/012031
State	Published - 1 Jan 2010

ASJC Scopus subject areas

General Physics and Astronomy

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Prikhna, T. A., Gawalek, W., Tkach, V. M., Danilenko, N. I., Savchuk, Y. M., Dub, S. N., Moshchil, V. E., Kozyrev, A. V., Sergienko, N. V., Wendt, M., Melnikov, V. S., Dellith, J., Weber, H., Eisterer, M., Schmidt, C., Habisreuther, T., Litzkendorf, D., Vajda, J., Shapovalov, A. P., ... Starostina, A. V. (2010). Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride. Journal of Physics: Conference Series, 234(PART 1), Article 012031. https://doi.org/10.1088/1742-6596/234/1/012031

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title = "Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride",

abstract = "The effect of doping with Ti, Ta, SiC in complex with synthesis temperature on the amount and distribution of structural inhomogeneities in MgB2 matrix of high-pressure-synthesized-materials (2 GPa) which can influence pinning: higher borides (MgB12) and oxygen-enriched Mg-B-O inclusions, was established and a mechanism of doping effect on jc increase different from the generally accepted was proposed. Near theoretically dense SiC-doped material exhibited jc= 106 A/cm 2 in 1T field and Hirr =8.5 T at 20 K. The highest jc in fields above 9, 6, and 4 T at 10, 20, and 25 K, respectively, was demonstrated by materials synthesized at 2 GPa, 600 °C from Mg and B without additions (at 20 K jc= 102 A/cm2 in 10 T field). Materials synthesized from Mg and B taken up to 1:20 ratio were superconductive. The highest jc (6×104 A/cm2 at 20 K in zero field, Hirr= 5 T) and the amount of SC phase (95.3% of shielding fraction), Tc being 37 K were demonstrated by materials having near MgB12 composition of the matrix. The materials with MgB12 matrix had a doubled microhardness of that with MgB2 matrix (251.1 GPa and 13.081.07 GPa, at a load of 4.9 N, respectively).",

author = "Prikhna, {T. A.} and W. Gawalek and Tkach, {V. M.} and Danilenko, {N. I.} and Savchuk, {Ya M.} and Dub, {S. N.} and Moshchil, {V. E.} and Kozyrev, {A. V.} and Sergienko, {N. V.} and M. Wendt and Melnikov, {V. S.} and J. Dellith and H. Weber and M. Eisterer and Ch Schmidt and T. Habisreuther and D. Litzkendorf and J. Vajda and Shapovalov, {A. P.} and V. Sokolovsky and Nagorny, {P. A.} and Sverdun, {V. B.} and J. Kosa and F. Karau and Starostina, {A. V.}",

year = "2010",

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day = "1",

doi = "10.1088/1742-6596/234/1/012031",

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journal = "Journal of Physics: Conference Series",

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Prikhna, TA, Gawalek, W, Tkach, VM, Danilenko, NI, Savchuk, YM, Dub, SN, Moshchil, VE, Kozyrev, AV, Sergienko, NV, Wendt, M, Melnikov, VS, Dellith, J, Weber, H, Eisterer, M, Schmidt, C, Habisreuther, T, Litzkendorf, D, Vajda, J, Shapovalov, AP, Sokolovsky, V, Nagorny, PA, Sverdun, VB, Kosa, J, Karau, F & Starostina, AV 2010, 'Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride', Journal of Physics: Conference Series, vol. 234, no. PART 1, 012031. https://doi.org/10.1088/1742-6596/234/1/012031

TY - JOUR

T1 - Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride

AU - Prikhna, T. A.

AU - Gawalek, W.

AU - Tkach, V. M.

AU - Danilenko, N. I.

AU - Savchuk, Ya M.

AU - Dub, S. N.

AU - Moshchil, V. E.

AU - Kozyrev, A. V.

AU - Sergienko, N. V.

AU - Wendt, M.

AU - Melnikov, V. S.

AU - Dellith, J.

AU - Weber, H.

AU - Eisterer, M.

AU - Schmidt, Ch

AU - Habisreuther, T.

AU - Litzkendorf, D.

AU - Vajda, J.

AU - Shapovalov, A. P.

AU - Sokolovsky, V.

AU - Nagorny, P. A.

AU - Sverdun, V. B.

AU - Kosa, J.

AU - Karau, F.

AU - Starostina, A. V.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - The effect of doping with Ti, Ta, SiC in complex with synthesis temperature on the amount and distribution of structural inhomogeneities in MgB2 matrix of high-pressure-synthesized-materials (2 GPa) which can influence pinning: higher borides (MgB12) and oxygen-enriched Mg-B-O inclusions, was established and a mechanism of doping effect on jc increase different from the generally accepted was proposed. Near theoretically dense SiC-doped material exhibited jc= 106 A/cm 2 in 1T field and Hirr =8.5 T at 20 K. The highest jc in fields above 9, 6, and 4 T at 10, 20, and 25 K, respectively, was demonstrated by materials synthesized at 2 GPa, 600 °C from Mg and B without additions (at 20 K jc= 102 A/cm2 in 10 T field). Materials synthesized from Mg and B taken up to 1:20 ratio were superconductive. The highest jc (6×104 A/cm2 at 20 K in zero field, Hirr= 5 T) and the amount of SC phase (95.3% of shielding fraction), Tc being 37 K were demonstrated by materials having near MgB12 composition of the matrix. The materials with MgB12 matrix had a doubled microhardness of that with MgB2 matrix (251.1 GPa and 13.081.07 GPa, at a load of 4.9 N, respectively).

AB - The effect of doping with Ti, Ta, SiC in complex with synthesis temperature on the amount and distribution of structural inhomogeneities in MgB2 matrix of high-pressure-synthesized-materials (2 GPa) which can influence pinning: higher borides (MgB12) and oxygen-enriched Mg-B-O inclusions, was established and a mechanism of doping effect on jc increase different from the generally accepted was proposed. Near theoretically dense SiC-doped material exhibited jc= 106 A/cm 2 in 1T field and Hirr =8.5 T at 20 K. The highest jc in fields above 9, 6, and 4 T at 10, 20, and 25 K, respectively, was demonstrated by materials synthesized at 2 GPa, 600 °C from Mg and B without additions (at 20 K jc= 102 A/cm2 in 10 T field). Materials synthesized from Mg and B taken up to 1:20 ratio were superconductive. The highest jc (6×104 A/cm2 at 20 K in zero field, Hirr= 5 T) and the amount of SC phase (95.3% of shielding fraction), Tc being 37 K were demonstrated by materials having near MgB12 composition of the matrix. The materials with MgB12 matrix had a doubled microhardness of that with MgB2 matrix (251.1 GPa and 13.081.07 GPa, at a load of 4.9 N, respectively).

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U2 - 10.1088/1742-6596/234/1/012031

DO - 10.1088/1742-6596/234/1/012031

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SN - 1742-6588

VL - 234

JO - Journal of Physics: Conference Series

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IS - PART 1

M1 - 012031

ER -

Effect of higher borides and inhomogeneity of oxygen distribution on critical current density of undoped and doped magnesium diboride

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