Jiang Sheng-lin

The influence of ferroelectric KTN particles on electric properties of 0–3 ferroelectric composites

A triphasic ferroelectric composite is obtained when ferroelectric potassium tantalate niobate particles [KTN] with a high dielectric constant and electric conductivity are embedded in a traditional 0–3 manganese and niobate modified lead zirconate titanate [PMNZT]/polyvinylidene fluoride trifluoroethylene [P(VDF-TrFE)] copolymer biphasic-ferroelectric composite. The electric properties are studied for the ferroelectric composite in which the volume fraction of KTN particles is in the range 0%–24% and KTN is a passive phase. The experimental data show that the volume fraction of KTN particles strongly influence the electric properties of ferroelectric composite, and that the triphasic composite doped with KTN has higher ferroelectric, piezoelectric and pyroelectric properties than the biphasic composite with the same PMNZT volume fraction.

Study of piezoelectric ceramic materials for high temperature and high frequency applications

Abstract In this paper, some methods to get piezoelectric ceramic materials for high temperature and high frequency applications based on modified PbTiO8 piezoelectric ceramics were introduced. A solid solution system (1 -X)PbTiO8+ XPb(Cd1/8Nb2/8)O8 was studied for their piezoelectric properties as B position complex substitution of ABO8 perovskite structure. The system(X = 14mol%) has good piezoelectric properties by adding some proper modified additives, such as WO8, MnO2 and NiO. The Curie temperature, is over 450°C and the dielectric constant, ϵ S, is about 200 at room temperature. The piezoelectric coupling factor kt is 0.45 and mechanical quality factor Qm can be changed from 500 to 2400 according to different situation. Their high stability makes it possible to be used in high temperature and high frequency situations.