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Phase boundary of an LMN-PZ-PT three-component system

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Abstract

Piezoelectric ceramics of Pb(Zr,Ti)O3 (PZT) were added to a third component La(Mg2/3Nb1/3)O3 (LMN) to form an LMN-PZ-PT three-component system. The morphotropic phase boundary (between the tetragonal phase and rhombohedral phase) was close to the PbZrO3 site. The phase boundary between the tetragonal and cubic phase was close to the PbTiO3 site, and the composition 9/62/29 was the three-phase point. The grain size could be reduced by increasing the amount of LMN in the PZT system. Replacing lead ions with lanthanum ions would induce a strain in the lattice because the diameter of the lanthanum ion is smaller than that of the lead ion. The best electromechanical coupling coefficient (Kp) found was 53.7 and the component was close to the morphotropic phase boundary.

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Authors and Affiliations

  1. Department of Materials Science, National Tsing Hua University, Hsin-Chu, Taiwan

    Jin-Chen Shaw, Kuo-Shung Liu & I-Nan Lin

  2. Materials Science Centre, National Tsing Hua University, Hsin-Chu, Taiwan

    I-Nan Lin

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  1. Jin-Chen Shaw
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  2. Kuo-Shung Liu
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  3. I-Nan Lin
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Shaw, JC., Liu, KS. & Lin, IN. Phase boundary of an LMN-PZ-PT three-component system. JOURNAL OF MATERIALS SCIENCE 28, 5534–5539 (1993). https://doi.org/10.1007/BF00367826

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