公开(公告)号：EP1310584B1

公开(公告)日：2011-11-16

申请号：EP02728094.0

申请日：2002-05-21

申请人： International Superconductivity Technology Center, The Juridical Foundation

发明人： LEE, Sergey, Romanovich ,  YAMAMOTO, Ayako ,  TAJIMA, Setsuko

IPC分类号： C30B29/10 ,  C01B35/04

CPC分类号： C01B35/04 ,  B01J3/062 ,  B01J2203/0605 ,  B01J2203/0645 ,  B01J2203/068 ,  Y10T29/49014 ,  Y10T29/49117

摘要： Means for producing an MgB2 single crystal and a useful superconductive material using the anisotropic superconductive characteristics thereof. A mixture material of Mg and B or a precursor containing MgB2 microcrystals produced by reacting them is brought into contact with hexagonal crystal BN, and they are held at high temperature (1300 ° C to 1700 ° C) under high pressure (3 to 6 GPa) so as to grow anisotropic MgB2 single crystals having superconductive properties through intermediate products. The single crystal has a feature that the irreversible magnetic field is 95% or more of the second critical magnetic field depending on the direction of the applied magnetic field, and therefore can be a superconductive material having excellent characteristics by adjusting the crystal orientation. It is advantageous for single crystal growth to be coexistent with a reducer such as Mg during the reaction or by establishing a temperature gradient in the melt.

公开(公告)号：EP1310584A1

公开(公告)日：2003-05-14

申请号：EP02728094.0

申请日：2002-05-21

申请人： International Superconductivity Technology Center, The Juridical Foundation

发明人： LEE, Sergey, Romanovich ,  YAMAMOTO, Ayako ,  TAJIMA, Setsuko

IPC分类号： C30B29/10 ,  C01B35/04

CPC分类号： C01B35/04 ,  B01J3/062 ,  B01J2203/0605 ,  B01J2203/0645 ,  B01J2203/068 ,  Y10T29/49014 ,  Y10T29/49117

摘要： The invention is intended to establish means for manufacturing MB 2 single crystals and to provide a useful superconductive material (wire rod and so forth) taking advantage of anisotropic superconductive properties thereof. A mixed raw material of Mg and B or a precursor containing MgB 2 crystallites, obtained by causing reaction of the mixed raw material of Mg and B, kept in contact with hexagonal boron nitride (hBN), is held at a high temperature in the range of 1300 to 1700°C and under a high pressure in the range of 3 to 6 GPa to cause reaction for forming an intermediate product, thereby growing the MB 2 single crystals having anisotropic superconductive properties via the intermediate product. The single crystals have features such that, depending on a direction in which a magnetic field is applied thereto, an irreversible magnetic field strength becomes equivalent to not less than 95% of a second magnetic field strength, so that adjustment of crystal orientation thereof results in production of a superconductive material excellent in property. Further, it is useful in effecting growth of the single crystals to cause a reducing agent such as Mg and so forth to coexist at the time of the reaction, or to provide a temperature gradient in melt occurring in the course of the reaction.

摘要翻译： 本发明旨在建立用于制造MB2单晶的手段，并且利用其各向异性超导性能来提供有用的超导材料（线棒等）。 通过与与六方氮化硼（hBN）保持接触的Mg和B的混合原料的反应获得的Mg和B的混合原料或含有MgB 2微晶的前体在高温下保持在 1300至1700℃，在3至6GPa的高压下引起反应，形成中间产物，从而通过中间产物生长具有各向异性超导性能的MB2单晶。 单晶具有这样的特征：根据施加磁场的方向，不可逆磁场强度变得等于不小于第二磁场强度的95％，从而导致晶体取向的调整 生产性能优异的超导材料。 此外，在实现单晶生长以使Mg等还原剂在反应时共存，或在反应过程中提供熔体中的温度梯度是有用的。