Convergent-bceam diffraction studies on lead zirconate titanate Ceramics

Lead zirconate titanate, Pb(Zr,Ti)O3 (PZT), ceramics are ferroelectrics formed as solid solutions between ferroelectric PbTiO3 and ant iferroelectric PbZrO3. The subsolidus phase diagram is shown in figure 1. PZT transforms between the Ti-rich tetragonal (T) and the Zr-rich rhombohedral (R) phases at a composition which is nearly independent of temperature. This phenomenon is called morphotropism, and the boundary between the two phases is known as the morphotropic phase boundary (MPB). The excellent piezoelectric and dielectric properties occurring at this composition are believed to.be due to the coexistence of T and R phases, which results in easy poling (i.e. orientation of individual grain polarizations in the direction of an applied electric field). However, there is little direct proof of the coexistence of the two phases at the MPB, possibly because of the difficulty of distinguishing between them. In this investigation a CBD method was found which would successfully differentiate between the phases, and this was applied to confirm the coexistence of the two phases.

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Effect of TiO2 Nanopowders on the Sintering and Electric Properties of Lead Zirconate Titanate Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.228 ◽

2007 ◽

Vol 336-338 ◽

pp. 228-230

Author(s):

Guang Hui Li ◽

Zhang Lian Hong ◽

Li Xia Peng ◽

Min Quan Wang

Keyword(s):

Dielectric Properties ◽

Bulk Density ◽

Lead Zirconate Titanate ◽

Sintering Temperature ◽

Lead Zirconate ◽

Electric Properties ◽

Pzt Ceramics ◽

Zirconate Titanate ◽

Titanate Ceramics ◽

Tio2 Nanopowder

XRD, SEM, bulk density and dielectric properties measurements were used to investigate the effect of TiO2 nanopowder substitution for conventional TiO2 micro-powder on the sintering and electric properties of PZT ceramics. Results revealed that the sintering temperature of dense Pb(Zr0.53Ti0.47)O3 ceramics was lowered about 50°C ~ 100°C when 20% and 40% of conventional TiO2 micro-powder was substituted by TiO2 nanopowder. The electric properties were kept or even enhanced in the PZT ceramics adopted the TiO2 nanopowder.

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Sol-Gel Bonded Piezoelectric Lead Zirconate Titanate Ceramics

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.45.2477 ◽

2006 ◽

Vol 45 ◽

pp. 2477-2482

Author(s):

Chontira Sangsubun ◽

Anucha Watcharapasorn ◽

Manoch Naksata ◽

Tawee Tunkasiri ◽

Sukanda Jiansirisomboon

Keyword(s):

Crystal Structure ◽

Lead Zirconate Titanate ◽

Sol Gel ◽

Rhombohedral Phase ◽

Lead Zirconate ◽

Dielectric Constants ◽

Pzt Ceramics ◽

Zirconate Titanate ◽

Piezoelectric Lead Zirconate Titanate ◽

Titanate Ceramics

The sol-gel bonded lead zirconate titanate, PbZr0.52Ti0.48O3 (PZT), ceramics were prepared by calcining and sintering at high temperatures the mixture between a conventional mixedoxide powder and a sol from a triol sol-gel method. The effects of sintering condition on phase formation, microstructures and dielectric properties were investigated and compared with the conventional and sol-gel PZT ceramics. X-ray diffraction analysis indicated that, in the ceramics containing sol-gel powder, the crystal structure changed from tetragonal to rhombohedral phase as the sintering temperature increased from 1150°C to 1200°C. This change in crystal structure also affected the microstructure of the ceramics. The dielectric constants at Tc of the sol-gel ceramics were found to be greatest and this suggested a possible use of sol-gel powder to produce PZT ceramics for high temperature applications.

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