ON THE ELECTRICAL PROPERTIES OF POLYCRYSTALLINE DELAFOSSITE-TYPE AgNiO2.

Article abstract of DOI:10.1016/0022-4596(88)90338-6

AgNiO//2 is prepared by reaction of molten silver nitrate with NaNiO//2. Powder X-ray diffraction shows that the compound has the delafossite structure of space group R OVER BAR 3m. Magnetic data give evidence for the localization of the 3d-electrons of most Ni atoms. Electrical conductivity and thermoelectric measurements performed between 4. 2 and 300 K on polycrystalline samples show that AgNiO//2 behaves like a semimetal. N-type and p-type charge carriers are created by a slight overlapping of the d band of silver atoms with the sigma antibonding band resulting from the overlapping of the Ni 3d- and O 2p-orbitals.