Abstract
Abstract Two types of solid solutions exist in the La2CuO4-Nd2CuO4 system, with respectively the T/O and T′ type structure of La2CuO4 and Nd2CuO4. When synthesized in air at high temperature and normal pressure, both solid solutions exhibit semi-conducting properties. A treatment under oxygen pressure causes a slight change in the unit cell parameters of the T/O type solid solution, a significant shift of its upper limit towards higher neodynium contents and a small increase of the average oxidation state of copper. All these modifications result from the insertion of some oxygen species in the T/O type-structure and induce a superconducting behaviour.
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