Solid-state reactions in ceramic materials have been investigated for many years under both fundamental and technological points of view. Recently, we have investigated thin film solid state reactions of BaO vapour with (110) and (100) TiO 2 (rutile) surfaces forming variuos Ba-Ti-O phases [1,2,3]. Large holes had been occasionally observed during those investigations at the interface with the rutile substrate at 900°C [1,3]. However, the mechanism of pore formation was not considered in

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... Consequently, the aim of the present work is to study the mechanism of void formation during vapour-solid reaction between BaO vapour and (100) TiO 2 surfaces at 900°C.