The structures of B ~C U O ~, ~~ and B ~C U O ~. ~~ have been refined using powder neutron diffraction methods \ rith th , object of determining the location of the excess oxygen and its eff&t on the copper co-ordination chemistry; the results are interpreted in relation to thermogravimetric analysis data for these materials and bond length-bond strength calculations.
Abstract.We report the results of measurements of the low-temperature specific heat Cp(T ) and the ac susceptibility χac(T ) in low applied magnetic fields for a series of samples of Eu1−xCaxB6. The anomalies in Cp(T ), together with the results for χac(T ) and M (H), confirm the onset of phase transitions to long range magnetic order for x < 0.7 and provide evidence that for x ≥ 0.7, the Eu moments, which are captured in large magnetic clusters with magnetic moments of the order of 260 µB, adopt a spin-glass type ground state. The data set allows to establish the low-temperature [T ,x]
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