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首页> 外文期刊>Journal of Ceramic Processing Research. (Text in English) >Preparation of polycrystalline samples of solid solutions Sm_(1+x)Ba_(2-x)Cu3O_(6+y) (x = 0.0-0.7) and a study of their structural and superconducting properties
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Preparation of polycrystalline samples of solid solutions Sm_(1+x)Ba_(2-x)Cu3O_(6+y) (x = 0.0-0.7) and a study of their structural and superconducting properties

机译：固溶体Sm_（1 + x）Ba_（2-x）Cu3O_（6 + y）（x = 0.0-0.7）多晶样品的制备及其结构和超导性能的研究

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摘要

Single-phase polycrystalline samples of Sm1Ba2Cu3O_(6+y) (123 SmSS) with x = 0.0-0.7 were prepared in air by solid state synthesis with precisely controlled technological parameters (the heating and cooling rates, temperature-time regime). Microstructural, structural, and superconducting properties were studied. It is shown that cation stoichiometric samples of Sm1Ba2Cu3O_(6+y) with a high temperature superconducting transition (89-92 K) can be obtained in air. By increasing the Sm/Ba ratio in Sm_(1+x)Ba_(2-x)Cu3O_(6+y) the orthorhombic-to-tetragonal phase transition is observed. The orthorhombic phase loses its stability at x > 0.125, and the solid solution decomposes by a spinodal mechanism to form layered microstructures with a variable Sm/ Ba ratio. The data obtained are useful for understanding the mechanisms of the formation of possible vortex pinning centers in Ln_(1+x)Ba_(2-x)Cu3O_(6+y) phases.
机译：在空气中通过固态合成以精确控制的技术参数（加热和冷却速率，温度-时间范围）制备了x = 0.0-0.7的Sm1Ba2Cu3O_（6 + y）（123 SmSS）单相多晶样品。研究了微结构，结构和超导性能。结果表明，在空气中可获得具有高温超导转变（89-92 K）的Sm1Ba2Cu3O_（6 + y）的阳离子化学计量样品。通过增加Sm_（1 + x）Ba_（2-x）Cu3O_（6 + y）中的Sm / Ba比，可以观察到正交相到四方相变。正交晶相在x> 0.125时失去稳定性，固溶体通过旋节线机理分解，形成具有可变Sm / Ba比的层状微结构。获得的数据对于理解Ln_（1 + x）Ba_（2-x）Cu3O_（6 + y）相中可能的旋流钉扎中心形成的机理很有用。

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