| 三点弯曲加载下YBCO电阻及K_(1c)特征研究 |
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| 引用本文： | 曾文光,林光明,张进修. 三点弯曲加载下YBCO电阻及K_(1c)特征研究[J]. 中山大学学报(自然科学版), 1989, 0(3) |
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| 作者姓名： | 曾文光 林光明 张进修 |
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| 作者单位： | 中山大学物理学系，中山大学物理学系，中山大学物理学系 |
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| 摘 要： | 在300K和77K下,用三点弯曲方法测定了零电阻温度为79～85K的YBCO长条状超导试样的电阻压头位移曲线和平面应变断裂韧性K_(1c)。结果表明,77K下零电阻特性可以保持到完全断裂前瞬间,由K_(1c)得到的表面能比300K的高,高出的部分可被认为是应力诱导下的少量超导相变所附加的能量。
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| 关 键 词： | 断裂韧性 应力诱导相变 表面能 高T_c超导体 |
A Characteristic Study of Resistance and K_(1c) of YBCO by Three Point Bend Method |
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| Zeng Wenguang,Lin Guangming,Zhan JinXiu. A Characteristic Study of Resistance and K_(1c) of YBCO by Three Point Bend Method[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 1989, 0(3) |
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| Authors: | Zeng Wenguang Lin Guangming Zhan JinXiu |
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| Affiliation: | Zeng Wenguang;Lin Guangming;Zhan JinXiu Department of Physies |
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| Abstract: | The curves of resistance-displacement of the loadhead and the fracture tou-ghnese K_(1c) have been determined in 300K and 77K respectivety by using the three po-int bend method for the high Tc superconductor YBCO samples. It is shown that(1) the character of zero resistance in 77K can be held under looding untill thesample has been ruptured completely; (2) the surface energy computed from K_(1c)in 77K is larger than that in 300K, it can be explained with the phase transitioninduced by stress field. |
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| Keywords: | fracture toughness phase transition induced by stress surface energy high Tc superconductor |
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