Structural and dielectric properties of Ce-doped BaTi_(0.97)Y_(0.03)O_(3)powders,with the chemical formulation(Ba_(1−x)Ce_(x))(Ti(_(0.97−x/4))-Y_(0.03))O_(3)such as x=0%,1%,3%,5%,7%and 9%,produced by the sol-gel metho...Structural and dielectric properties of Ce-doped BaTi_(0.97)Y_(0.03)O_(3)powders,with the chemical formulation(Ba_(1−x)Ce_(x))(Ti(_(0.97−x/4))-Y_(0.03))O_(3)such as x=0%,1%,3%,5%,7%and 9%,produced by the sol-gel method,have been investigated.X-ray diffraction analysis showed that Ce^(3+)ions incorporated Ba sites until x=7%indicating that this concentration represents a solubility limit of Ce^(3+)ions in BaTi_(0.97)Y_(0.03)O_(3)matrix.Scanning electron microscopy(SEM)analysis showed a decrease in grain size down to the same concentration of 7%.Raman spectroscopy analysis showed the appearance of A_(1g) mode,which we attributed to the effect of incorporation of Ce^(3+)and Y^(3+)in BaTiO_(3)matrix.Dielectric measurements revealed that doping with cerium lowers the temperature of permittivity maximum at the ferroelectric-to-paraelectric transition(FPT)of the BaTi_(0.97)Y_(0.03)O_(3)sample,and reaches a value that should be below 40℃ for x=9%.Moreover,the phenomenon of dielectric resonance was observed on all Ce-doped samples,which was not the case with other dopants as reported in the literature.展开更多
文摘Structural and dielectric properties of Ce-doped BaTi_(0.97)Y_(0.03)O_(3)powders,with the chemical formulation(Ba_(1−x)Ce_(x))(Ti(_(0.97−x/4))-Y_(0.03))O_(3)such as x=0%,1%,3%,5%,7%and 9%,produced by the sol-gel method,have been investigated.X-ray diffraction analysis showed that Ce^(3+)ions incorporated Ba sites until x=7%indicating that this concentration represents a solubility limit of Ce^(3+)ions in BaTi_(0.97)Y_(0.03)O_(3)matrix.Scanning electron microscopy(SEM)analysis showed a decrease in grain size down to the same concentration of 7%.Raman spectroscopy analysis showed the appearance of A_(1g) mode,which we attributed to the effect of incorporation of Ce^(3+)and Y^(3+)in BaTiO_(3)matrix.Dielectric measurements revealed that doping with cerium lowers the temperature of permittivity maximum at the ferroelectric-to-paraelectric transition(FPT)of the BaTi_(0.97)Y_(0.03)O_(3)sample,and reaches a value that should be below 40℃ for x=9%.Moreover,the phenomenon of dielectric resonance was observed on all Ce-doped samples,which was not the case with other dopants as reported in the literature.
