The structure of the new compound YBaCo4O7 with a magnetic feature

• Single crystals and pure powder samples of the new compound YBaCo4O7 have been obtained by solid-state reactions, using different temperature programs. From X-ray powder diffraction the structure was determined as hexagonal, space group P6(3)mc. having the cell parameters a = 6.2982(4) and c = 10.2467(9) Angstrom. This phase is isostructural with that previously reported for LuBaZn3.09Al0.91O7. Refinements of powder neutron diffraction data collected at two different temperatures and X-ray single crystal data at room temperature, agree well. Changes with temperature in the relative positions of Co and its surrounding oxygen atoms are the only geometrical manifestation of a probable spin-glass transition at about 65 K from the high temperature paramagnetic state.

Nyckelord

cobalt oxides

geometrical frustration

single crystal XRD

NPD

neutron-diffraction

crystal-structure

x-ray

oxides

ho

dy

gd

eu

sm

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