Effects of high pressure on the physical properties of MgB2
Abstract
The synthesis of MgB2-based materials under high pressure gave the possibility to suppress the evaporation of magnesium and to obtain near theoretically dense nanograined structures with high superconducting, thermal conducting, and mechanical characteristics: critical current densities of 1.8-1.0 \cdot 106 A/cm2 in the self field and 103 A/cm2 in a magnetic field of 8 T at 20 K, 5-3 \cdot 105 A/cm2 in self field at 30 K, the corresponding critical fields being HC2 = 15 T at 22 K and irreversible fields Hirr =13 T at 20 K, and Hirr =3.5 T at 30 K, thermal conduction of 53+/-2 W/(m \cdot \kappa), the Vickers hardness Hv=10.12+/-0.2 GPa under a load of 148.8 N and the fracture toughness K1C = 7.6+/-2.0 MPa m0.5 under the same load, the Young modulus E=213 GPa. Estimation of quenching current and AC losses allowed the conclusion that highpressure-prepared materials are promising for application in transformer-type fault current limiters working at 20-30 K.
Keywords
Cite
@article{arxiv.1005.2092,
title = {Effects of high pressure on the physical properties of MgB2},
author = {T. Prikhna and W. Gawalek and Ya. Savchuk and A. Soldatov and V. Sokolovsky and M. Eisterer and H. W. Weber and J. Noudem and M. Serga and V. Turkevich and M. Tompsic and V. Tkach and N. Danilenko and W. Goldacker and F. Karau and I. Fesenko and M. Rindfleisch and J. Dellith and M. Wendt and S. You and V. Meerovich and S. Dub and V. Moshchil and N. Sergienko and A. Kozyrev and T. Habisreuther and Ch. Schmidt and D. Litzkendorf and P. Nagorny and V. Sverdun},
journal= {arXiv preprint arXiv:1005.2092},
year = {2010}
}
Comments
International Conference on Superconductivity and Magnetism 25-30 April 2010,Antalya, Turkey, in print Journal of Superconductivity and Novel Magnetism