Some different oxygen content La4Ni3O10+δ (δ=0.02,0.12,−0.22) compounds were prepared in order to study the influence of Ni3+ content on the electronic properties. A metal–metal transition was detected at 140 K for the as-prepared (La4Ni3O10.02) and reduced (La4Ni3O9.78) compounds. From the electrical conductivity, Seebeck coefficient and magnetic studies of the different samples, oxygen stoichiometry was found to be a critical parameter in defining the existence of a less conductive low temperature state. The results are interpreted assuming the existence of charge order in the nickel oxide planes of the layered perovskite-type structure.
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Carvalho et al. (2000) studied this question.
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