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Oxygen nonstoichiometry, electrical conductivity and thermal expansion of La2xSrxNiO4-\delta phases with high levels of strontium substitution (1 =< x =<1.4) have been investigated in air and oxygen atmosphere in the temperaturerange 20-1050 degrees C. These phases retain the K2NiF4-type structure ofLa2NiO4 (tetragonal, space group I4/mmm). The oxygen vacancy fraction wasdetermined independently from thermogravimetric and neutron diffractionexperiments, and is found to increase considerably on heating. The electricalresistivity, thermal expansion and cell parameters with temperature showpeculiar variations with temperature, and differ notably fromLa2NiO4$\pm$\delta in this respect. These variations are tentatively correlatedwith the evolution of nickel oxidation state, which crosses from a Ni3+/Ni4+ toa Ni2+/Ni3+ equilibrium on heating.

High-temperature oxygen non-stoichiometry, conductivity and structure in strontium-rich nickelates La2-xSrxNiO4-\delta (x = 1 and 1.4)