Low-temperature sintering method of Mg<11>B2 isotope superconductor

Abstract

The invention relates to a low-temperature sintering method of a Mg<11>B2 isotope superconductor. The method comprises the following steps: sufficiently mixing Mg powder and amorphous <11>B powder in a ratio of (0.9-1.2):2 in an agate mortar, and making the mixture into cylindrical pieces under a pressure of 2-10MPa; putting the cylindrical pieces into a thermogravimetric and differential thermal analyzer; in an atmosphere of flowing high-purity argon, heating to 450-800 DEG C at a rate of 10-40 DEG C / min, and preserving heat for 5-15 hours; cooling to room temperature along with furnace at a cooling speed of 10-40 DEG C / min to synthesize the Mg<11>B2 isotope superconductor. In the invention, a Mg<11>B2 superconductor material with high carrying current and 'low activity' is obtained through a low-temperature and solid-phase sintering method. The crystal structure is a hexagonal structure; and the Mg<11>B2 isotope superconductor has the advantages of relatively high critical transition temperature, stable chemical properties, simple components, no pollution, wide source of raw materials, relatively low preparation cost and use cost and wide application prospect.

Description

technical field [0001] The invention belongs to the field of superconducting technology, and particularly proposes high current-carrying "low activity" Mg 11 B 2 Low-temperature sintering preparation technology of isotopic superconducting bulk. Background technique [0002] In early 2001, Nagamatsu et al. found that the superconducting critical transition temperature (T c )39K of MgB 2 The new superconductor has aroused widespread concern in the scientific community. MgB 2 It has excellent properties such as simple structure, long coherence length, high critical current density and stable chemical properties. [0003] Controlled thermonuclear fusion energy is the ultimate ideal clean energy for mankind. The Tokamak, which uses a strong magnetic field to confine high-temperature plasma, is considered to be the most promising device for realizing controllable thermonuclear fusion reactions. As a key component of the tokamak, the research and development of a stable supe...

AI Technical Summary

Problems solved by technology

A large number of previous studies are still in the initial stage of predicting properties by theoretical calculations, and the superconducting properties of only a few experimentally prepared bulks are not ideal.

The same problem was encountered in previous attempts, due to Mg and 11 B reaction activity is too low to cause severe oxidation, resulting in sample failure

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