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Composition control and electrical properties of PMN-PT thin films around the morphotropic boundary

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Abstract

We have successfully grown (1-x)Pb(Mg1/3- Nb1/3)O3-xPbTiO3 (PMN-PT) thin films with x=0.3, 0.35 and 0.4 by pulsed laser deposition. X-ray-diffraction studies reveal that the PMN-PT films grown on La0.5Sr0.5CoO3/LaAlO3 substrates form epitaxial heterostructures. Composition control and remedial measures to compensate for the lead and magnesium losses due to re-evaporation are demonstrated. As a common feature, the as-grown PMN-PT thin films exhibit a self-poling behavior. Their dielectric constants measured at room temperature vary from 1500 to 2500, depending on the PMN to PT ratios. The pyroelectric coefficient of the films varies from 160 to 300 μC/m2K. The piezoelectric coefficient d33 is around 27 pm/V in the as-grown 70/30 films. A comparison of these values with the bulk PMN-PT of same compositions implies that the much-reduced piezoelectric properties in the PMN-PT films are primarily due to a substrate-clamping effect.

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Authors and Affiliations

  1. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    J. Wang, K.H. Wong, H.L.W. Chan & C.L. Choy

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  1. J. Wang
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  2. K.H. Wong
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  3. H.L.W. Chan
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  4. C.L. Choy
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Correspondence to J. Wang.

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PACS

77.84.-s; 77.65.-j; 77.80.-e

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Wang, J., Wong, K., Chan, H. et al. Composition control and electrical properties of PMN-PT thin films around the morphotropic boundary. Appl. Phys. A 79, 551–556 (2004). https://doi.org/10.1007/s00339-003-2355-6

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  • DOI: https://doi.org/10.1007/s00339-003-2355-6

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