Effect of La₂O₃ Additions on Microstructure, Morphology and Pressure Sensing Behaviour of PZT Based Ceramics Sintered in Al₂O₃ Environment

Abstract:

Effect of La2O3 addition on microstructure, morphology and pressure sensing behaviour of (Pb1-x, Lax)(Zr0.52, Ti0.48)O3 based ceramics was studied in three different compositions of La2O3, namely x = 0.10, 0.12 and 0.15. The samples were prepared through a conventional solid-state reaction method using high purity metal oxides powders. In order to control the PbO losses due to high sintering temperature, a novel approach was explored whereby the samples were sintered in Al2O3 environment. Structural investigation using XRD revealed that all samples exhibited a tetragonal crystal structure. However the c/a ratios exhibited a decreasing trend as the La2O3 content increased, indicating that (Pb1-x, Lax)(Zr0.52, Ti0.48)O3 crystals gradually evolved towards pseudocubic structure. SEM micrographs showed that in all samples the grains have uniform pebble stone morphology. The average grain size reduced from ~ 4.5 µm to ~ 3.0 µm with the increment of La¬2O3 content. The performance of pressure sensing behaviour which was investigated using custom-made pressure chamber showed that sample with composition of x = 0.10 exhibited the best piezoelectric properties with high pressure sensitivity, good stability and repeatability.

• Periodical: Advanced Materials Research (Volume 173)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.173.96
• Online since: December 2010
• Authors: Mohammad Hafizuddin Haji Jumali, Ying Ying Tio, Ramli Norhashimah, Mat Salleh Muhammad, Muhammad Yahaya
• Keywords: Morphological Analysis, PLZT, Pressure Sensing Behaviour, Solid-State Reaction, Tetragonal Structure

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