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Research articles

ScienceAsia 46S (2020):ID 51-57 |doi: 10.2306/scienceasia1513-1874.2020.S007

Temperature dependence on structure, mechanical and electrical properties of bismuth lanthanum sodium titanate-modified lead zirconate titanate ceramics

Pharatree Jaitaa,b, Parkpoom Jarupoomc,*

ABSTRACT:     The effects of sintering condition on phase evolution, physical, microstructure and dielectric properties of the PZT-3BLNT ceramics were investigated. The samples were prepared by a conventional mixed oxide method and sintered at the temperatures ranging from 10501200 °C under normal atmosphere for 2 h dwell time with a heating/cooling rate of 5 °C/min. X-ray diffraction indicated that the mixed rhombohedral-tetragonal phases were observed at lower sintering temperature of 1050 °C, while the tetragonal phase became dominant at higher sintering temperature (1200 °C). The optimum sintering temperature for preparation of high-density PZT-3BLNT ceramic was found to be 1200 °C. Linear shrinkage and average grain size tended to increase with increasing the sintering temperature. The effects of annealing conditions on mechanical and dielectric properties of the PZT-3BLNT ceramic sintered at 1200 °C were also studied in this work. It was found that the maximum room temperature dielectric constant (εr ) of 1313 and Vickers hardness (HV) of 4.38 GPa were achieved for the sample annealed at 950 °C for 8 h dwell time and this value was ∼1820% higher than that of the unannealed sample. This result was also well correlated with the maximum relative density observed for this annealing condition.

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a Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand
b Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200 Thailand
c Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Lanna, Chiang Mai 50300 Thailand

* Corresponding author, E-mail: noteparkpoom@gmail.com

Received 16 Oct 2019, Accepted 26 Dec 2019