Effects of Li2O and Na2O Addition on Growth and Electrical Properties of PbTiO3 Single Crystals

parent red-brown and brown single crystals, respec tively, and had average size of 3.0•~2.8•~1.1mm and 3.6•~2.8•~1.0mm. (3) The content of Li2O in all the Li doped crystals was less than 0.01wt%, whereas the Na2O content was more than 0.07wt% and increased with increasing addition of Na2O. (4) Crystals doped with Li2O showed no variations in the lattice constant, but the lattice constant of c-axis and axial ratio of crys tals doped with Na2O were smaller than those of un doped crystal. (5) Electrical properties of the crystals were affected by the addition of Li2O or Na2O. The elec trical conductivity of crystals was very low (10-10S•E cm-1) for Li2O addition but that of crystals for Na2O ad dition was high (10-8S• cm-1) at room temperature. At temperature above 300•Ž, the current-voltage characteristic curve of the crystal doped with Li2O was composed of two parts, ohmic and non-ohmic ones. EH decreased remarkably with increasing temperature.