物理化学学报 >> 1988, Vol. 4 >> Issue (03): 239-243.doi: 10.3866/PKU.WHXB19880304

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高Tc LaBa2Cu3O7-δ超导相的制备和结构研究

张玉芬; 郑香苗; 朱文杰; 林炳雄; 唐有祺   

  1. 北京大学物理化学研究所应用物化研究室
  • 收稿日期:1988-03-24 修回日期:1900-01-01 发布日期:1988-06-15
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PREPARATION AND STRUCTURAL STUDY OF HIGH TC SUPERCONDUTING PHASE LaBa2Cu3O7-δ

Zhang Yufen*; Zheng Xiangmiao; Zhu Wenjie; Lin Bingxiong; Tang Youqi   

  1. Institate of Physical Chemistry; Peking University
  • Received:1988-03-24 Revised:1900-01-01 Published:1988-06-15
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Abstract: A stable orthorhombic superconduting phase LaBa_2Cu_3O_(7-δ), with T_c 82K and Meissner effect 13.6%, has been prepared by citric acid complexation with nitrates. It is determined to be an orderly three layer Ba-La-Ba, oxygen-deficient perovskite structure by X-ray powder diffraction and atomic valence calculation. Through high temperature XRD and DTA-TG study,the phase transition of orthorhombic into tetragonal structure is found to be reversible, and occurs at 450 ℃, not the value 350 ℃ proposed by A. Maeda et al. The superconduting properties are improved as the responsible orthorhombic structure deviates more from tetragonality.