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Correlation of Bi and Cu valencies with structural modulation in Bi2Sr2(Ca1−x Yx)Cu2Oy

Published online by Cambridge University Press:  31 January 2011

T. Kawano ,
F. Munakata ,
H. Yamauchi  and
S. Tanaka
T. Kawano*
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome 1-Chome Koto-ku, Tokyo 135, Japan
F. Munakata
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome 1-Chome Koto-ku, Tokyo 135, Japan
H. Yamauchi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome 1-Chome Koto-ku, Tokyo 135, Japan
S. Tanaka
Affiliation:
Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome 1-Chome Koto-ku, Tokyo 135, Japan
*
a)Permanent address: 7-7 Suehiro-cho, 1-chrome, Tsurumi-ku, Yokohama 230, Japan.
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Abstract

The valencies of the Bi and Cu ions in Bi2Sr2(Ca1−x Yx)Cu2Oy were determined separately by a coulometric titration technique. The Cu valency decreased monotonically from 2.16 to 2.04 with increasing Y content over the range from 0 to 1. Superconductivity occurred for Cu valency greater than 2.1. The Bi valency was also found to decrease from +3.12 to +2.99 as the Y content increased. It leveled off at ∼ +3.0 for the Y content larger than 0.8. This change in the Bi valency was correlated with the change in the structural modulation period and with its transformation from an incommensurate to a commensurate state.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 299 - 302
Copyright
Copyright © Materials Research Society 1992

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