Perovskite-type structure compounds having the general empirical formula ABO3 are prepared by a process comprising subjecting a mixture of starting powders formulated to contain the components represented by A and B in the formula to a high energy milling sufficient to induce chemical reaction of the components and thereby synthesize a mechanically-alloyed powder comprising the perovskite in the form of nanostructural particles. The process according to the present invention is simple, efficient, not expensive and does not require any heating step for producing a perovskite that may easily show a very high specific surface area. Another advantage is that the perovskite obtained according to the present invention also has a high density of lattice defects thereby showing a higher catalytic activity, a characteristic which is highly desirable in their eventual application as catalysts and electronic conductors.
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