Formation of TiO2 and KTiOPO4 nanoclusters on the (001) surface of KTiOPO4 crystal upon annealing

Morphology and crystallographic characteristics of (001) KTiOPO4 air-annealed surface were investigated. The autoepitaxy of nanosized KTiOPO4 islands was revealed in samples annealed at 550°C for 2–20 h. When annealing at 650°C takes ∼20 h, the TiO2 particles are observed to form on the substrate surface. This indicates the onset of the thermal decomposition of KTP at this temperature.