SPACE GROUP DETERMINATION OF Li2O·3Nb2O5 BY CONVERGENT BEAM ELECTRON DIFFRACTION

Convergent beam electron diffraction (CBED) is a powerful technique for symmetry study of crystal. It has widespread application in physics and material sciences, as demonstrated in a recent superconducting oxide study. Using this technique, we have studied Ba-La-Cu-O superconductors with a transition temperature of about 40 degrees K and Ba-Y-Cu-O superconductors with a critical temperature (Tc) of about 90 degrees K. We have found that in Ba-La-Cu-O superconductors the superconducting phase La2-xBaxCuO4-y has a distorted K2NiF4-type structure and the space group Fmmm. The two other phases in Ba-La-Cu-O superconductors have also been studied. In our Ba-Y-Cu-O superconductors, the Ba2YCu3O7-x compound, which is responsible for 90 degrees K superconductivity, has two different space groups: An orthorhombic space group Pmmm and a tetragonal space group P4mm or P4/mmm.

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Application of convergent beam electron diffraction in the structural study of high‐temperature superconducting oxides

Zou

Yang

Zhou

1987

J. Elec. Microsc. Tech.

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SPACE GROUP DETERMINATION OF Li2O·3Nb2O5 BY CONVERGENT BEAM ELECTRON DIFFRACTION

Abstract: Dynamic extinction lines which occur in CBED patterns have been used to determine the presence of twofold screw axis and glide plane in Li2O·3Nb2O5. The space group is found to be P21/a.

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Application of convergent beam electron diffraction in the structural study of high‐temperature superconducting oxides

Application of convergent beam electron diffraction in the structural study of high‐temperature superconducting oxides

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