TEXTURING OF MAGNETIC-MATERIALS AT HIGH-TEMPERATURE BY SOLIDIFICATION IN A MAGNETIC-FIELD
TEXTURING OF MAGNETIC-MATERIALS AT HIGH-TEMPERATURE BY SOLIDIFICATION IN A MAGNETIC-FIELD
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DOI：
10.1038/349770a0
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发表时间：
1991-02-28
期刊：
影响因子：
64.8
通讯作者：
PERNET, M
中科院分区：
文献类型：
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作者：
DERANGO, P;LEES, M;PERNET, M
在材料科学的许多领域中，在晶体材料上施加优选取向或“纹理”的能力是重要的。 一般来说，晶体材料在其性质上或多或少是各向异性的，这取决于它们的晶格结构，并且纹理化允许在应用中使用最有利的方向（例如，对于电流或磁化率）。 铁磁材料可以通过“磁性退火”来纹理化-粉末材料在磁场中的取向，通常随后是烧结步骤-但这必须在低于材料居里温度的温度下进行。 在这里，我们提出了一种新的织构材料，在高温下，在其磁化率的残余各向异性的方法，在磁场中固化。 这一步的过程，这可能被称为“顺磁退火”，证明了高温超导体YBa_2Cu_3O_7的应用。
THE ability to impose a preferred orientation, or 'texture', on a crystalline material is important in many fields of materials science. In general, crystalline materials are more or less anisotropic in their properties, depending on their lattice structure, and texturing allows the most favourable direction (for example, for current flow or magnetic susceptibility) to be used in applications. Ferromagnetic materials can be textured by 'magnetic annealing'-the orientation of powdered material in a magnetic field, usually followed by a sintering step-but this must be done at temperatures below the material's Curie temperature. Here we present a new method of texturing materials that have a residual anisotropy in their magnetic susceptibility at high temperature, by solidification in a magnetic field. This one-step process, which may be called 'paramagnetic annealing', is demonstrated by application to the high-temperature superconductor YBa2Cu3O7.