Metal Sn doped MgB2 superconductor and low-temperature rapid preparation method thereof

A superconductor and metal technology, applied in the field of superconductivity, can solve the problems of no systematic explanation and demonstration, blindness of metal elements, etc.

Inactive Publication Date: 2009-12-02
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although metal elements or intermetallic compounds doped MgB 2 The synthesis and preparation of superconductors have been widely studied, but most of these studies are limited to the scope of high-temperature sintering, and the metal element doping MgB 2 The low-temperature sintering research of superconductors is in the initial stage of exploration, and these prior studies have not given a systematic elaboration and demonstration of the

Method used

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  • Metal Sn doped MgB2 superconductor and low-temperature rapid preparation method thereof
  • Metal Sn doped MgB2 superconductor and low-temperature rapid preparation method thereof
  • Metal Sn doped MgB2 superconductor and low-temperature rapid preparation method thereof

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example 1

[0037] The dopant of Mg powder, B powder and Sn powder is calculated according to the atomic ratio (Mg 1.02 B 2 ) 0.99 sn 0.01 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders were pressed into cylindrical flakes under a pressure of 2Mpa, and then the pressed samples were placed in a high-temperature differential scanning calorimeter crucible, and continuously heated to 550°C at a heating rate of 5°C / min for sintering and holding for 4 hours. , and then lowered to room temperature at a cooling rate of 30°C / min. Determined by detection (Mg 1.02 B 2 ) 0.99 sn 0.01 The middle phase composition is Mg 2 Sn, residual Mg phase and a small amount of MgB 2 phase (such as figure 2 As shown in b), at this time MgB 2 The crystal form is not obvious (such as image 3 b), indicating that sintering is in the early stage of solidification reaction.

example 2

[0039] The dopant of Mg powder, B powder and Sn powder is calculated according to the atomic ratio (Mg 1.02 B 2 ) 0.97 sn 0.03 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders were pressed into cylindrical flakes under a pressure of 10 MPa, and then the pressed samples were placed in a high-temperature differential scanning calorimeter crucible, and continuously heated to 600 °C at a heating rate of 10 °C / min for sintering and holding for 5 hours. , and then down to room temperature at a cooling rate of 35 °C / min. . Determined by detection (Mg 1.02 B 2 ) 0.96 sn 0.03 The main phase is MgB 2 Phase and Mg 2 Sn phase (such as figure 2 shown in c), and MgB 2 The crystal form obviously did not grow up (such as image 3 As shown in c), at the same time, the superconductor has high superconducting properties (such as Image 6 and 7 shown).

example 3

[0041] The dopant of Mg powder, B powder and Sn powder is calculated according to the atomic ratio (Mg 1.02 B 2 ) 0.95 sn 0.05 Mix and grind in an agate mortar for half an hour to mix well. These mixed powders were pressed into cylindrical flakes under a pressure of 5Mpa, and then the pressed samples were placed in a high-temperature differential scanning calorimeter crucible, and the heating rate was continuously heated to 590°C at a rate of 20°C / min for sintering and heat preservation for 6 hours. It was then cooled down to room temperature at a cooling rate of 40°C / min. . It was found by detection (Mg 1.02 B 2 ) 0.95 sn 0.05 Has good superconducting properties (such as Image 6 and 7 shown).

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Abstract

The invention relates to a metal Sn doped MgB2 superconductor and a low-temperature rapid preparation method thereof. A structural formula of the superconductor is (Mg1.02B2)1-xSnx, wherein x=0.01-0.05. The method comprises the following steps: fully mixing Mg powder, B powder and Sn powder according to atomic ratio, pressing and preparing the mixture into a cylindrical flake under the pressure of 2 to 10 MPa, and then putting the cylindrical flake into a high temperature differential scanning calorimeter or a tubular sintering furnace for sintering; and continuously heating the cylindrical flake to 550 to 600 DEG C at heating rate of 5 to 20 DEG C per minute for sintering treatment, and cooling the cylindrical flake to room temperature at cooling rate of 30 to 40 DEG C per minute. Analysis results show that the critical current density of the MgB2 superconductor is greatly improved compared with the MgB2 superconductor obtained under the same sintering condition. The preparation method is simple, the raw materials have low cost, the preparation temperature is low, the preparation time is short, the obtained superconductor has obvious superconductivity, and the method is a quite potential research method.

Description

technical field [0001] The invention belongs to the field of superconducting technology, in particular to a metal Sn-doped MgB 2 Superconductor and low-temperature rapid preparation method. Background technique [0002] Since H.K.Onnes discovered the superconductivity of mercury in 1911 [1] , People have been exploring this superconducting phenomenon arduously. After nearly a hundred years of hard work, human beings have made great progress in the understanding of superconductivity and the practical application of superconductors, but so far there are still new superconductors discovered. Since superconductors can be used in fields such as power transmission, electric motors, and military technology [2] , so that superconducting technology has broad application prospects and great development potential. [0003] In 2001, Japanese scientist J.Nagamatsu and others discovered the highest superconducting transition temperature (T c =39K) intermetallic compound superconducto...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/64
Inventor 刘永长姜海马宗青董治中余黎明
Owner TIANJIN UNIV
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