MISCIBILITY GAP IN ELECTROCHEMICALLY OXYGENATED LA2CUO4+DELTA

The miscibility gap of La2CUO4+delta was investigated by studying thre e electrochemically oxygenated samples with different oxygen contents, using variable-temperature neutron powder diffraction. The low-temper ature lattice parameters of the two coexisting orthorhombic phases (an tiferromagnetic, Bmab and superconducting, Fmmm) were found to be in g ood agreement with those determined for high-pressure annealed samples , indicating that the two techniques yield essentially identical sampl es, at least in this concentration range. A sample with delta almost-e qual-to 0.032 remained phase separated up to 415 K and, above this tem perature, was found to be single-phase tetragonal (F4/mmm). The phase separation temperature and the orthorhombic-to-tetragonal phase transi tion temperature were obtained for all samples, allowing the shape of the miscibility gap to be determined.