Preparation of b-axis Oriented BaTi₂O₅ Thin Films by Pulsed Laser Deposition

A new kind of b-axis oriented BaTi_2O_5 thin film was prepared on MgO (100) substrates by pulsed laser deposition.The effects of substrate temperature (T_(sub)) and oxygen partial pressure (Po_2) on the crystal phase and preferred orientation were investigated.The BaTi_2O_5 thin films exhibits (710) or (020) orientation,which depends on the substrate temperature and oxygen partial pressure.On the deposition condition of T_(sub)=700℃and Po_2=12.5Pa,the b-axis oriented BaTi_2O_5 film is successfully obtained.The film has a dense and smooth surface,showing an elongated granular texture.