Preparation and Electrical Properties of Modified Lead Titanate Ceramics

Perovskite‐Structured BiFeO3–Bi(Zn1/2Ti1/2)O3–PbTiO3 Solid Solution Piezoelectric Ceramics with Curie Temperature About 700°C

“…Like the 0.95PbTiO 3 –0.05Bi(Zn 1/2 Ti 1/2 )O 3 and 0.6PbTiO 3 –0.3Bi(Zn 1/2 Ti 1/2 )O 3 –0.1BiFeO 3 cases, robust mechanical BiFeO 3 –Bi(Zn 1/2 Ti 1/2 )O 3 –PbTiO 3 ceramics were obtained here in a wide composition range as shown in the Fig . For the (0.85− x )BF–0.15BZT– x PT ceramics, temperature‐dependent dielectric properties were measured and some results presented in the Fig.…”

“…Unfortunately, in polycrystalline tetragonal pure PbTiO 3 and PbTiO 3 –BiFeO 3 , the internal tensile stresses resulting from large tetragonal distortion and negative thermal expansion coefficient (TEC) make the ceramics fragile, whereas high conductivity of BiFeO 3 and BiFeO 3 –PbTiO 3 ceramics discouraged ones to investigate their piezoelectric properties. Recently, the authors experimentally demonstrated that adding Bi(Zn 1/2 Ti 1/2 )O 3 into BiFeO 3 –PbTiO 3 and PbTiO 3 to form solid solution paves the road to obtain both mechanical and insulating robust ceramics for surveying piezoelectric properties of those promising high‐temperature piezoceramics . Comparing various PbTiO 3 ‐based compounds with tetragonality from unity to 1.18, it was concluded that the large negative TEC rather than large tetragonal distortion plays a key role in determining their mechanical properties, and adding Bi(Zn 1/2 Ti 1/2 )O 3 into PbTiO 3 and PbTiO 3 –BiFeO 3 reduces TEC to make ceramics mechanically robust …”

“…Recently, the authors experimentally demonstrated that adding Bi(Zn 1/2 Ti 1/2 )O 3 into BiFeO 3 -PbTiO 3 and PbTiO 3 to form solid solution paves the road to obtain both mechanical and insulating robust ceramics for surveying piezoelectric properties of those promising high-temperature piezoceramics. [12][13][14][15] Comparing various PbTiO 3 -based compounds with tetragonality from unity to 1.18, it was concluded that the large negative TEC rather than large tetragonal distortion plays a key role in determining their mechanical properties, and adding Bi(Zn 1/2 Ti 1/2 )O 3 into PbTiO 3 and PbTiO 3 -BiFeO 3 reduces TEC to make ceramics mechanically robust. 13,14 In this article, BiFeO 3 -Bi(Zn 1/2 Ti 1/2 )O 3 -PbTiO 3 ternary solid solutions were fabricated with traditional solid-state reaction, and their lattice structure and ferroelectric phase transition were investigated with various compositions and ceramic processing.…”

Ferroelectric and piezoelectric properties of high temperature (Bi,La)FeO3–Bi(Zn1/2Ti1/2)O3–PbTiO3ceramics at rhombohedral/tetragonal coexistent phase

“…[9][10][11] Recently, adding Bi(Zn 1=2 Ti 1=2 )O 3 into BF-PT to form ternary solid solution (BF-BZT-PT) has been experimentally demonstrated feasible to obtain mechanically robust ceramics through reducing negative TEC towards zero. [12][13][14][15][16] As shown in Fig. 1, coexistent phase boundary (CPB) observed in the BF-PT binary system is extended widely with BZT content up to 35%.…”

Residual tensile stresses and piezoelectric properties in BiFeO3-Bi(Zn1/2Ti1/2)O3-PbTiO3 ternary solid solution perovskite ceramics

“…Recently, it is demonstrated that adding Bi(Zn 1/2 Ti 1/2 )O 3 (BZT) into BF-PT to form ternary solid solution paves the road to obtain both mechanical and insulating robust ceramics for surveying their piezoelectric properties, which takes the following advantages: 1) negative TEC decreases to reduce tensile stresses caused by ferroelectric structural phase transition after sintering; [13][14][15] 2) thermodynamic stability of BiFeO 3 perovskite phase is enhanced to reduce the volatility of Bi 2 O 3 and resulted vacancies in crystallographic lattice; [16][17][18][19] 3) composition range of structural phase boundary is extended widely and 4) ferroelectric T C increased further more than 630 o C. 18,19 In the BF-BZT-PT ternary system, T C was observed around 700 o C for coarse-grained (0.85-y)BF-0.15BZT-yPT solid solution ceramics with 0.30 ≤ y ≤ 0.38 across the tetragonal-tetragonal/rhombohedral coexistent structural phase boundary, which can be modified furthermore through adjusting microstructural grain size and/or element substitution. [18][19][20] In contrast to Bi 4 Ti 3 O 12 system, perovskitestructured BF-BZT-PT ternary system takes advantage of the structural phase boundary like the PZT system intrinsically benefitting for high piezoelectricity 3,21,22 to design high performance ferroelectric piezoceramics suitable for high temperature applications through adjusting composition and crystallographic structure.…”