TETRAGONAL TO CUBIC PHASE TRANSFORMATION IN TANTALUM OXIDE DOPED LEAD ZIRCONIUM TITANATE CERAMIC

Ceramic of tantalum oxide doped lead zirconium titanate [( )( ) ] 1 / 2 x 1 x y 3 Zr Ti Ta O y y Pb - - - (PTZT) ceramic were successfully deposited by solid solution method. The PTZT ceramic were analyzed by x-ray diffraction (XRD). The XRD spectra was recorded on a Philips type PW 3701 diffractometer using CuKa (lco = 1.54056 A) radiation at 30 KV and 30 mA (900 watt). The XRD spectra shows that for a tantalum oxide doped lead zirconium titanate [( )( ) ] 1 / 2 x 1 x y 3 Zr Ti Ta O y y Pb - - - ceramic with x = 0.525 and y = 0, 0.005, 0.01, and 0.015 has a tetragonal phase, and when x = 0.525 and y = 0.0108 it is in cubic phase. Increasing the tantalum oxide doping from 0 % to 1.5 % led to the decrease of c/a ratio The reform value of the lattice constant of PTZT ceramic is possibly associated with the anti site defects of Pb, Zr and Ta. Keywords: PTZT, dopant, ceramic, solid solution