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Structural Order/Disorder in the AlSr2YCu2O7Compound

✍ Scribed by J. Ramı́rez-Castellanos; Y. Matsui; M. Isobe; E. Takayama-Muromachi

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
732 KB
Volume
133
Category
Article
ISSN
0022-4596

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✦ Synopsis

From X-ray diffraction (XRD) data, AlSr 2 YCu 2 O 7 phase shows a tetragonal unit cell and space group P4/mmm, with lattice parameters a ‫؍‬ b‫)5(268.3؍‬ A > and c ‫؍‬ 11.095(5) A > . From selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM) studies, a superstructure with related parameters a s ‫؍‬ 2a t , b s ‫؍‬ 4a t , and c s ‫؍‬ 2c t was found, which is considered to be due to the existence of two types of symmetry-related zigzag AlO chains along the a-direction. Simultaneously, some interlayer disordering occurs, which can be due to the disordered arrangement of these two AlO 4 chains along the c-axis.

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