Post-sinter annealing of Pb0.7La0.2TiO3 derived from mechanical activation

作者：Soon HP^*; Xue JM; Wang J

来源：Integrated Ferroelectrics, 2004, 62: 35-41.

DOI：10.1080/10584580490460358

• lanthanum-doped lead titanate
• Pb0.7La0.2TiO3
• post-sinter annealing
• space charge polarization
• oxygen vacancies
• dielectric behaviors

To investigate the relationships between the dielectric behaviors and defect structures in Pb0.7La0.2TiO3, such as A-site vacancies and oxygen vacancies, post-sinter annealing in oxygen and nitrogen were conducted. Upon initial annealing in oxygen, space charge polarization, manifesting with A-site vacancies created by PbO evaporation from the surface region, dominates the dielectric properties of Pb0.7La0.2TiO3. Prolonged annealing in oxygen, for example, for more than 4 hours, led to a steady fall in both dielectric constant and dielectric loss. Annealing in nitrogen resulted in a similar rise in the dielectric proper-ties at the initial stage, followed by a slow down in the increase rate at extended duration of annealing, when the perovskite structure is destabilized in combination with the interactions between oxygen vacancies and A-site vacancies.

• 出版日期2004