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首页> 外文期刊>Journal of Materials Science >THE HIGH-TEMPERATURE THERMAL EXPANSION OF BIPBSRCACUO SUPERCONDUCTOR AND THE OXIDE COMPONENTS (BI2O3, PBO, CAO, CUO)
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THE HIGH-TEMPERATURE THERMAL EXPANSION OF BIPBSRCACUO SUPERCONDUCTOR AND THE OXIDE COMPONENTS (BI2O3, PBO, CAO, CUO)

机译：BiPBSRCACUO超导体和氧化物组分（BI2O3，PBO，CAO，CUO）的高温热膨胀

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摘要

The thermal expansion of superconducting Bi1.6Pb0.4Sr2Ca2Cu3Ox (BiPbSrCaCuO) and its oxide components Bi2O3, PbO, CaO and CuO have been studied by high-temperature dilatometric measurements (30-800 degrees C). The thermal expansion coefficient for the BiPbSrCaCuO superconductor in the range 150-830 degrees C is alpha = 6.4 x 10(-6) K-1. The temperature dependences of Delta L/L of pressed Bi2O3 reveals sharp changes of length on heating (T-1 = 712 degrees C), and on cooling (T-2 = 637 degrees C and T-3 = 577 degrees C), caused by the phase transition monoclinic-cubic (T-1) and by reverse transitions via a metastable phase (T-2 and T-3). By thermal expansion measurements of melted Bi2O3 it is shown that hysteresis in the forward and the reverse phase transitions may be partly caused by grain boundary effect in pressed Bi2O3. The thermal expansion of red PbO reveals a sharp decrease in Delta L/L on heating (T-1 = 490 degrees C), related with the phase transition of tetragonal (red, a = 0.3962 nm, c = 0.5025 nm) - orthorhombic (yellow, a = 0.5489 nm, b = 0.4756 nm, c = 0.5895 nm). The possible causes of irreversibility of the phase transition in PbO are discussed. In the range 50-740 degrees C the coefficient of thermal expansion of pressed Bi2O3 (alpha(m) = 3.6 x 10(-6) and alpha(c) = 16.6 x 10(-6) K-1 for monoclinic and cubic Bi2O3 respectively), the melted Bi2O3 (alpha(m) = 7.6 x 10(-6) and alpha(c) = 11.5 x 10(-6) K-1), PbO (alpha(t) = 9.4 x 10(-6) and alpha(or) = 3.3 x 10(-6) K-1 for tetragonal and orthorhombic PbO respectively), CaO (alpha = 6.1 x 10(-6) K-1) and CuO (alpha = 4.3 x 10(-6) K-1) are presented. [References: 10]
机译：通过高温膨胀测量法（30-800摄氏度）研究了超导Bi1.6Pb0.4Sr2Ca2Cu3Ox（BiPbSrCaCuO）及其氧化物Bi2O3，PbO，CaO和CuO的热膨胀。 BiPbSrCaCuO超导体在150-830摄氏度范围内的热膨胀系数为alpha = 6.4 x 10（-6）K-1。压制的Bi2O3的Delta L / L的温度依赖性表明，长度的急剧变化是由于加热（T-1 = 712摄氏度）和冷却（T-2 = 637摄氏度，T-3 = 577摄氏度）引起的。通过单斜相（T-1）的相变和通过亚稳相（T-2和T-3）的反向相变。通过对熔融的Bi2O3进行热膨胀测量，可以看出，正向和反向相变中的磁滞可能部分是由压制Bi2O3中的晶界效应引起的。红色PbO的热膨胀显示加热时（T-1 = 490摄氏度）的Delta L / L急剧下降，与四方形（红色，a = 0.3962 nm，c = 0.5025 nm）-正交（黄色，a ＝ 0.5489nm，b ＝ 0.4756nm，c ＝ 0.5895nm）。讨论了PbO中相变不可逆的可能原因。在50-740摄氏度范围内，单斜晶和立方Bi2O3的压制Bi2O3的热膨胀系数（alpha（m）= 3.6 x 10（-6）和alpha（c）= 16.6 x 10（-6）K-1分别），熔化的Bi2O3（alpha（m）= 7.6 x 10（-6）和alpha（c）= 11.5 x 10（-6）K-1），PbO（alpha（t）= 9.4 x 10（-6） ）和alpha（or）= 3.3 x 10（-6）K-1（分别对于四方和正交的PbO），CaO（alpha = 6.1 x 10（-6）K-1）和CuO（alpha = 4.3 x 10（-） 6）提出了K-1）。 [参考：10]

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