Synthesis, Characterization, Photoluminescence and Piezoelectric Study of Dy(1.98)Yb(0.02)Ti(2)O(7)and Lu1.98Er0.02Ti2O7

Dy(1.98)Yb(0.02)Ti(2)O(7)and Lu(1.98)Er(0.02)Ti(2)O(7)with the cubic pyrochlore structure were prepared at 1050 degrees C and 1400 degrees C using solid state reaction method. The crystal structure and unit cell parameters of powder samples were determined by X-ray diffraction method (XRD). Using TG/DTA thermal analysis, we determined the thermal behaviours of starting materials and Curie temperature of fine samples. Dy(1.98)Yb(0.02)Ti(2)O(7)and Lu(1.98)Er(0.02)Ti(2)O(7)have high Curie temperature at 770 degrees C and 765 degrees C, respectively. To determine morphological structure, elemental composition, photoluminescence properties, dielectric constant, loss tangent, and piezoelectric charge constant of Dy(1.98)Yb(0.02)Ti(2)O(7)and Lu1.98Er0.02Ti2O7, scanning electron microscope (SEM), photoluminescence spectrophotometer (PL), LCR-meter and d(33-)meter were used. The results show that Dy(1.98)Yb(0.02)Ti(2)O(7)and Lu(1.98)Er(0.02)Ti(2)O(7)are multifunctional materials which show both photoluminescence properties and piezoelectric properties.