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A single-phase sample of the LaSrCuO3.58 composition is prepared by solid-state synthesis at 1473 K in air. The conductivity of LaSrCuO3.58 is measured by a four-probe method at direct current in the temperature range from 298 to 1173 K at oxygen partial pressures from 28 to 2.1 × 104 Pa. Heating samples above ∼670 K is shown to result in a changeover of the conduction type from semiconducting (p-type)...
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