Internal friction and Young´s modulus of titanium-doped lead magnesium niobate

The dielectric properties, internal friction and Young´s modulus of (1-x%) Pb(Mg₁3/Nb₂3/)O₃-x%PbTiO₃ (for x=13,23,33) ceramics have been measured. A phase-transition like internal friction peak associated with Young´s modulus softening has been observed at temperature T_R-F, which can be attributed to the Relaxor to Ferroelectrics (R-F) phase transition. Therefore, the R-F phase transition can be explained in terms of the paraelectric to ferroelectric phase transition of paraelectric matrix in the materials. The softening of Young´s modulus corresponding to the appearance of polar nano-domains is also found at the temperature far above T_m.