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silver cuprate (III); crystal structure; neutron diffraction; synchrotron radiation; high pressure
Abstract:
AgCuO2 has been obtained via a low temperature route. The
structure has been redetermined with Rietveld refinements using
neutron powder diffraction data [C2/m, a=6.0756(3),
b=2.8088(1), c=5.8728(3) Angstrom, beta=107.987(4)degrees, Z=2,
R-p=6.36%, R-wp=7.22%]. The crystal structure consists of
chains of ladder-like CuO4-rectangles running along [010],
interconnected by AgO2-dumbbells. For physical and crystal
chemical reasons the oxidation states +I for silver, and +III
for copper, respectively, have been assigned. High-pressure X-
ray powder diffraction experiments have been made. AgCuO2 is
stable with respect to decomposition and structural distortion
up to 36.3 GPa. The zero pressure bulk modulus of AgCuO2 is
estimated as 118.2 GPa. (C) 2002 Elsevier Science B.V. All
rights reserved.
