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Composition and crystal structure parameters of single crystals (Bi, Pb)2Sr2(Ca1−xRx)Cu2O8+δ (R = Y, Er, Ho, Tm, and Yb)

Published online by Cambridge University Press:  31 January 2011

A.S. Ilyushin ,
L. Shi ,
L.I. Leonyuk ,
B.M. Mustafa ,
I.A. Nikanorova ,
S.V. Red'ko ,
Y. Jia ,
A.G. Vetkin ,
G. Zhou  and
I.V. Zubov
A.S. Ilyushin
Affiliation:
Physics Department, Moscow State University, Moscow 117234, Russia
L. Shi
Affiliation:
Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
L.I. Leonyuk
Affiliation:
Geology Department, Moscow State University, Moscow 117234, Russia
B.M. Mustafa
Affiliation:
Physics Department, Moscow State University, Moscow 117234, Russia
I.A. Nikanorova
Affiliation:
Physics Department, Moscow State University, Moscow 117234, Russia
S.V. Red'ko
Affiliation:
Physics Department, Moscow State University, Moscow 117234, Russia
Y. Jia
Affiliation:
Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
A.G. Vetkin
Affiliation:
Geology Department, Moscow State University, Moscow 117234, Russia
G. Zhou
Affiliation:
Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
I.V. Zubov
Affiliation:
Physics Department, Moscow State University, Moscow 117234, Russia
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Abstract

To correlate structural and compositional parameters in the bismuth 2212 system, single crystals with the composition (Bi1−yPby)2Sr2(Ca1−xRx)Cu2O8+δ (R = Y, Er, Ho, Tm, and Yb; y = 0, 0.1; 0 ≤ x ≤ 0.5) have been studied at room temperature by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The main results are as follows: (i) The actual content, x, of R (R = Y, Er) in samples is in significant excess over its content x′ in the melt for x′ < 0.5. The opposite effect (but several times smaller) takes place for Ca. At x′ = 0.5, the x value practically coincides with x′. (ii) For all R under examination and x′ = 0.1, the value of x is within the limits of 0.43 ≤ x ≤ 0.51; i.e., x exceeds x′ several times. (iii) The total content of Ca, R (R = Y, Er), and Sr is close to 3 through the whole range 0 ≤ x′ ≤ 0.5. At x′ < 0.5 Ca is partly substituted for Sr, while R occupies only Ca crystallographic positions. Thus the actual formula of the samples is (Bi1-yPby)2+∊Sr2-z(Ca1+z-xRx)Cu2O8+δ. (iv) The evidence was received that the nonlinear dependence c(x) at x < 0.5 is connected with the partial substitution of Sr with Ca. The dependence of c, namely on the R = Y content in the denoted range of x, is close to linear with the slope ∂c/∂x = −0.67(2) Å/at.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 8 , August 1993 , pp. 1791 - 1797
Copyright
Copyright © Materials Research Society 1993

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References

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