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Citation: Zhang Yufen*, Zheng Xiangmiao, Zhu Wenjie, Lin Bingxiong, Tang Youqi. PREPARATION AND STRUCTURAL STUDY OF HIGH T_C SUPERCONDUTING PHASE LaBa₂Cu₃O_7-δ[J]. Acta Physico-Chimica Sinica, ;1988, 4(03): 239-243. doi: 10.3866/PKU.WHXB19880304 shu

PREPARATION AND STRUCTURAL STUDY OF HIGH T_C SUPERCONDUTING PHASE LaBa₂Cu₃O_7-δ

1.
Institate of Physical Chemistry; Peking University

Received Date: 24 March 1988
Available Online: 15 June 1988

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 tetra nal 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 tetra nality.
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PREPARATION AND STRUCTURAL STUDY OF HIGH TC SUPERCONDUTING PHASE LaBa2Cu3O7-δ

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PREPARATION AND STRUCTURAL STUDY OF HIGH T_C SUPERCONDUTING PHASE LaBa₂Cu₃O_7-δ