Abstract

Doping of a high-temperature Bi(Pb)-2223 superconductor with various additives, which can act as pinning centers and / or accelerate the formation of a superconducting phase, is an effective tool for obtaining Bi(Pb)-2223 samples with improved characteristics. In this paper, we studied the effect of the addition of hexagonal boron nitride (h-BN) on the phase formation and critical transport current density of ceramic samples Bi(Pb)-2223. Samples with a nominal composition of Bi_1.7Pb_0.3Sr₂Ca₂Cu₃O_y [BN]_x, x = 0–0.25 were prepared by the solid-phase reaction method. Two different doping methods were used: the introduction of hand-ground BN powder at the initial stage of synthesis and the addition of BN powder subjected to high-energy grinding in a ball mill before pelletizing. The phase composition of the obtained samples was studied by X-ray diffraction. The microstructure and elemental composition of the samples were studied using a scanning electron microscope with an X-ray microanalyzer. The resistivity and critical current density were measured using the standard four-probe method. The results show that boron nitride is a suitable additive to increase the rate of formation and critical transport current density Bi(Pb)-2223.

中文翻译：

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氮化硼添加剂对Bi（Pb）-2223超导体相形成和输运性能的影响

摘要

用各种添加剂掺杂高温Bi（Pb）-2223超导体可以充当钉扎中心和/或加速超导相的形成，是获得具有改进特性的Bi（Pb）-2223样品的有效工具。在本文中，我们研究了添加六方氮化硼（h -BN）对陶瓷样品Bi（Pb）-2223的相形成和临界传输电流密度的影响。标称成分为Bi _1.7 Pb _0.3 Sr ₂ Ca ₂ Cu ₃ O _y [BN] _x，x的样品通过固相反应法制得= 0-0.25。使用了两种不同的掺杂方法：在合成初期引入手工研磨的BN粉末，以及在制粒前在球磨机中添加经过高能研磨的BN粉末。通过X射线衍射研究获得的样品的相组成。使用带有X射线微量分析仪的扫描电子显微镜研究了样品的微观结构和元素组成。使用标准的四探针法测量电阻率和临界电流密度。结果表明，氮化硼是增加形成速率和临界传输电流密度Bi（Pb）-2223的合适添加剂。