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首页> 外文期刊>Philosophical Magazine Letters >Twin-boundary characteristics of melt-textured YBa_2Cu_3O_(7-x)
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Twin-boundary characteristics of melt-textured YBa_2Cu_3O_(7-x)

机译：熔融织构的YBa_2Cu_3O_（7-x）的双边界特性

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摘要

The twin-boundary characteristics of melt-textured YBa2Cu3O7-x have been investigated by transmission electron microscopy. Stoichiometric YBa2Cu3O7-x, Y2BaCuO5 phase-doped YBa2Cu3O7-x and YBa2Cu3O7-x with Y2BaCuO5 and additional Pt doping were studied. Pt leads to a drastic decrease in the b / a ratio and orthorhombicity. Therefore it is proposed that Pt substitutes for the Cu atoms of the CuO chains. The thickness of the twin boundary layer is reduced with decreasing oxygen content and by Pt doping. Two different types of twin boundary are observed which di er in their interfacial energy and structure. The twin spacing is reduced with the size of the twin domains. The domain size is strongly controlled by the density of Y2BaCuO5 inclusions which act as nucleation centres for the twin formation.
机译：通过透射电子显微镜研究了熔融织构的YBa2Cu3O7-x的双边界特性。研究了化学计量的YBa2Cu3O7-x，Y2BaCuO5相掺杂的YBa2Cu3O7-x和YBa2Cu3O7-x和Y2BaCuO5以及其他Pt掺杂。 Pt导致b / a比率和正交性急剧下降。因此，提出用Pt代替CuO链的Cu原子。随着氧含量的降低和Pt掺杂，双边界层的厚度减小。观察到两种不同类型的孪晶边界，它们的界面能和结构不同。孪晶间距随着孪晶畴的尺寸而减小。畴的大小受Y2BaCuO5夹杂物密度的强烈控制，它们作为孪晶形成的成核中心。

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