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Modulated structure in Bi2+xSr2−xCu1+yO6+δ

Published online by Cambridge University Press:  08 February 2011

Zenji Hiroi ,
Yasunori Ikeda ,
Mikio Takano  and
Yoshichika Bando
Zenji Hiroi
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan
Yasunori Ikeda
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan
Mikio Takano
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan
Yoshichika Bando
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan
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Abstract

The modulated structure in solid solution Bi2+xSr2−xCu1+yO6+δ (0.1 < x < 0.6, y ∼ x/4) has been investigated by means of powder x-ray diffraction, electron diffraction, and transmission electron microscopy. The [010] component of the modulation vector decreases almost linearly with increasing x, from 5.2b (x = 0.1) to 4.2b (x = 0.5), where b is the unit length of the average structure along the [010] direction, and is little sensitive to excess oxygen content δ. A structure model of the modulation based on a periodic substitution of Sr for Bi and formation of Bi blocks whose size varies with x is proposed. Relations among various modulations appearing in other related phases such as the Pb-substituted 105 K Tc phase are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 3 , March 1991 , pp. 435 - 445
Copyright
Copyright © Materials Research Society 1991

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