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The Doppler-broadened lineshape of 51 1 keV y rays emitted from annihilating positron-electron pairs, the positron lifetime and electrical resistivity of the amorphous Fe,,Ni4,P,,B6alloy have been measured in the C-500'C temperature range using isochronal annealing. The W parameter of the Doppler-broadened lineshape, related to core-electron annihilation, increased in two stages by annealing below the crystallisation temperature. These increases appear to be due to the loss of excess free volume in the as-quenched amorphous alloy.

The preparation of single-phase CuLaO2 with delafossite-type structure by means of the solid-state reaction method was investigated using X-ray diffraction. The results showed that notwhistanding the fact that there was a trace of metallic copper, nearly single-phase CuLaO2 was obtained by using La(OH)3 as a lanthanum source and by firing the mixed powder with nonstoichiometric composition ratio of La(OH)3:Cu2O =1:1.425 in a vacuum at 1273 K for 10 h. The measurement of electrical conductivity and Seebeck coefficient showed that CuLaO2 thus obtained was a p-type semiconductor and had a Seebeck coefficient of approximately 70 /V/K.

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