Electric properties of alkali metal doped potassium niobate crystals

Alkali metal (Na, Rb or Cs) doped KNbO3 single crystals are grown using an original pulling down method by means of co-doping with Na (small ionic size), Rb (large ionic sizes) or Cs (large ionic sizes) into KNbO3. Single-phase crystals are successfully grown with orthorhombic system at room temperature, for all the pure and doped KNbO3. Their electric properties, such as the dielectric constant and the impedance, are found to be changed according to the co-doping elements.