Abstract
Dy1.98Yb0.02Ti2O7 and Lu1.98Er0.02Ti2O7 with the cubic pyrochlore structure were prepared at 1050 °C and 1400 °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. Dy1.98Yb0.02Ti2O7 and Lu1.98Er0.02Ti2O7 have high Curie temperature at 770 °C and 765 °C, respectively. To determine morphological structure, elemental composition, photoluminescence properties, dielectric constant, loss tangent, and piezoelectric charge constant of Dy1.98Yb0.02Ti2O7 and Lu1.98Er0.02Ti2O7, scanning electron microscope (SEM), photoluminescence spectrophotometer (PL), LCR-meter and d33-meter were used. The results show that Dy1.98Yb0.02Ti2O7 and Lu1.98Er0.02Ti2O7 are multifunctional materials which show both photoluminescence properties and piezoelectric properties.
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