Temperature stability and fabrication of Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ fibers with Pt core

In order to improve the electrical properties of metal-core piezoelectric ceramic fibers at high temperature, Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ piezoelectric ceramics with high Curie temperature were selected. The Pb(Zn _1/3 Nb _2/3 ) O ₃ –Pb(Zr,Ti)O ₃ metal-core piezoelectric ceramic fibers were successfully fabricated by extrusion Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ powder around a platinum wire. The microstructure and electrical properties of Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ ceramics with different calcining and sintering temperatures were investigated. Compared with the previous metal-core piezoelectric ceramic fibers, the Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ fibers showed lower piezoelectric and dielectric properties ([Formula: see text], k ₃₁ = 0.253, and d ₃₁ = −120 pC N ⁻¹ ). However, the Curie temperature of Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ ceramics is about 295°C, much higher than that of 0.55Pb(Ni _1/3 Nb _2/3 )O ₃ –0.45Pb(Zr _0.3 Ti _0.7 )O ₃ ceramics (110°C). The Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ fibers can be used at the highest temperature of 150°C, and the temperature stability of Pb(Zn _1/3 Nb _2/3 )O ₃ –Pb(Zr,Ti)O ₃ fibers is much better than that of 0.55Pb(Ni _1/3 Nb _2/3 )O ₃ –0.45Pb(Zr _0.3 Ti _0.7 )O ₃ fibers.