Lanthanum Dependence of Elastic and Piezoelectric Properties of PLZT Ceramics with a Zr/Ti Ratio of 65/35 |
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Authors: | A H MEITZLER H M O'BRYAN JR |
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Affiliation: | Bell Telephone Laboratories, Incorporated, Murray Hill, New Jersey 07974 |
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Abstract: | The elastic and piezoelectric properties of PLZT ceramics with a 65/35 Zr/Ti ratio undergo pronounced changes as La is added to the structure. At the rhombohedral-tetragonal phase boundary, material constants plotted as functions of La concentration show strong discontinuities in slope; these discontinuities provide a precise means of locating the boundary. The radial-mode coupling factor, kp , compliance coefficient, S11 E , and piezoelectric coefficient, d31 , attain peak values at the boundary, whereas Poisson's ratio, σE, and the resonance-frequency constant exhibit pronounced minima. This behavior is evidence of the increasing ferroelastic sensitivity of the material as the distortion angle of the rhombohedral phase approaches a minimum. |
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