Fabrication and properties of 1-3 polymer modified cement piezoelectric composites

Piezoelectric ceramic (lead niobium lithium zirconate titanate，P(LN)ZT)，sulphoaluminate cement and polymer were used to fabricate polymer modified cement piezoelectric composites by the cut filling technique. The influence of P(LN)ZT volume fraction on the piezoelectric and dielectric properties of composites was investigated.The results show that as the P(LN)ZT volume fraction increases，the piezoelectric strain factor d₃₃，relative dielectric factor ε_r and the acoustic impedance Z increase evidently，while the piezoelectric voltage factor g₃₃ and the dielectric loss tanδdecrease. Compared with P(LN)ZT，the vibration at thickness mode of 1-3 type piezoelectric composite is strengthened，however the electromechanical quality factor is reduced. When P(LN)ZT volume fraction is 30.86 %，the acoustic impedance value is 8.24 ×10⁶ N·s/m^3，which is close to that of the concrete (9.0 ×10⁶ N·s/m³) and suitable for fabricating transducers for non destructive inspection.