Abstract
Nd-YAG-laser pulse irradiation of clamped Ni/Ti plates in oxygen was employed to synthesize fluorite-type (f) derived TiO 2 condensates dissolved up to 5 at% Ni 2+ of the cations. The nanocondensates less than 20 nm in size are nearly cubo-octahedral in shape and tended to transform martensitically to monoclinic ( m) baddeleyite-type following the crystallographic relationship (100) f //(110) m ; [001] f //[001] m . The condensates twice larger in size, with considerable matrix constraint, are nearly spherical in shape and consist of mosaic m-twin variants following complicated crystallographic relationships with each other and with the relic f-phase: (010) f //( 1 ¯ 2 0 ) m ; [001] f //[001] m . The charge and volume compensating oxygen vacancies due to NiO dissolution in the dense TiO 2 condensates could facilitate the relaxation and amorphization process.
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