Abstract
Four-circle x-ray diffraction measurements were carried out on a single crystal of Bi 2.1 Sr 1.9 Ca 2 Cu 3 O 10+δ with doping levels from underdoped to overdoped. The excess charge of each inequivalent CuO 2 plane was estimated using the obtained inter-atomic distances in two ways by means of the bond–valence-sum method. The copper valence and the valence sum of the copper and the surrounding oxygen ions gave contradictory results for the inhomogeneous charge distribution of the inequivalent CuO 2 planes.
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