Calculations concerning the phase diagram, dielectric constant and lattice parameters for the Pb(Zn1/3Nb2/3)O3-PbTiO3solid solution

The phase diagram, dielectric constant and lattice parameters were calculated for the Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) solid solution, using the phenomenological thermodynamic theory. The unknown coefficients for the energy function for PZN were estimated from the PZN-PT phase diagram. In the calculation, linear functions were assumed for the composition dependence of the coefficients. Based on comparisons between the calculation results and reported experimental results, the method was found to be effective in predicting properties of ferroelectric solid solutions.