Structural, electrical, luminescent, and magnetic properties of Ba_(0.77)Ca_(0.23)TiO_3:Eu ceramics

摘要

The structural, electrical, luminescent, and magnetic properties of Eu~(3+)-doped Ba_(0.77)Ca_(0.23)TiO_3 (BCT23:Eu) ceramics were investigated in this paper. Three different incorporation mechanisms of Eu~(3+) were realized in BCT23 by considering different charge compensation mechanisms: (ⅰ) Ca site substitution with Ca vacancy compensation; (ⅱ) Ti site substitution with O vacancy compensation; (ⅲ) simultaneous substitution at both Ca and Ti sites with self-compensation. Besides the evident ferroelectric properties, the BCT23:Eu ceramics showed the photoluminescence and paramagnetic properties, implying that they can be considered as the multifunctional materials. Both the electric and luminescent properties were sensitive to the Eu doping concentrations and positions, due to the variations of the microstructures and different charge compensation mechanisms.