Publication Type:Conference Paper
Source:Materials Research Society Symposium - Proceedings, Materials Research Society, Warrendale, PA, United States, Volume 596, p.505-510 (2000)
Keywords:Capacitors, electrochemical electrodes, Ferroelectric materials, Lanthanum alloys, Lead alloys, Lead magnesium niobate lead titanate film, Oxide electrode, Partial pressure, Permittivity, Piezoelectric property, Pulsed laser applications, pulsed laser deposition, Scanned probe microscope, substrates, surface structure, Thermal effects, Thin film devices
The effect of substrate induced constraint and misfit strain on the structure and piezoelectric properties of epitaxial relaxor ferroelectric lead magnesium niobate-lead titanate (PMN-PT) films were investigated. Relaxor PMN-PT epitaxial 100-400 nm thick films with top and bottom oxide electrodes were grown by pulsed laser deposition on (100) LaAlO3 substrates. A systematic decrease in the temperature of the dielectric maximum with increasing film thickness was observed. This is accompanied by an increase in the room temperature relative dielectric constant. The longitudinal piezoelectric coefficient measured using a scanned probe microscope, increases by almost an order of magnitude with increasing film thickness.
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