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Composition range and electrical properties of the morphotropic phase boundary in Bi0.5(Na0.80K0.20)0.5TiO3-(Ba0.7Sr0.3)TiO3 system

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Abstract

The lead-free piezoelectric ceramic binary system of (1-x)Bi0.5(Na0.80K0.20)0.5TiO3-x(Ba0.7Sr0.3)TiO3 or (1-x) BNKT-xBST (with x ranging from 0.05 to 0.15 mol fraction) near the morphotropic phase boundary (MPB) has been investigated. The ceramics were synthesized by a conventional mixed-oxide method and sintered at 1125°C for 2 h. All BNKT-BST samples had relative density higher than 98% of their theoretical values. X-ray diffraction patterns showed that all compositions had a pure perovskite structure and BST effectively diffused into the BNKT lattice during sintering to form a solid solution. Crystal structure changed from rhombohedral-rich phase to tetragonal-rich phase with increasing BST content. Because of such MPB-like behavior, the highest dielectric (T c = 325°C, ɛ r = 1827, tan δ = 0.0823) and piezoelectric performances (d 33 = 225 pC/N) were obtained in the BNKT-0.11BST sample.

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Authors and Affiliations

  1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Pharatree Jaita, Anucha Watcharapasorn & Sukanda Jiansirisomboon

  2. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

    Anucha Watcharapasorn & Sukanda Jiansirisomboon

Authors
  1. Pharatree Jaita
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  2. Anucha Watcharapasorn
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  3. Sukanda Jiansirisomboon
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Correspondence to Sukanda Jiansirisomboon.

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Jaita, P., Watcharapasorn, A. & Jiansirisomboon, S. Composition range and electrical properties of the morphotropic phase boundary in Bi0.5(Na0.80K0.20)0.5TiO3-(Ba0.7Sr0.3)TiO3 system. Electron. Mater. Lett. 9, 437–440 (2013). https://doi.org/10.1007/s13391-013-0027-z

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  • DOI: https://doi.org/10.1007/s13391-013-0027-z

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