Degradation of piezoelectric properties has been studied in ferroelectric PZT films by means of optical interferometry. The degradation under dc bias and aging of poled films have been observed. The decay of piezoelectric coefficient with time is described by a logarithmic law with aging rates comparable to those of switching polarization. The aging rates are shown to be sensitive to poling con...

Proofs of linearizability of concurrent data structures generally rely on identifying linearization points to establish a simulation argument between the implementation and the specification. However, for many linearizable data structure operations, the linearization points may not correspond to their internal static code locations; for example, they might reside in the code of another concurre...

We demonstrate a novel technique for instituting complex and arbitrary shaped micron-scale domain patterns in LiNbO3 at room temperature. Fabrication of continuous domains as narrow as 2 microm across and hexagonal patterns of the same order accompanied by real time visualization of the poling process are presented.

Aging rate (AR) of dielectric permittivity (ε33T/ε0) ternary Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PIN–PMN–xPT, x = 26 and 30 mol %) binary Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN–xPT, single crystals (SCs) grown by the continuous-feeding Bridgman method (CF-BM) were investigated. The AR was 0.6–2.0 %/decade, whereas that loss SCs 1–8 %/decade. Even though SC growth methods different, CF-BM PMN–30PT...

This paper demonstrates AFM-based post-release piezoelectric domain engineering [1] on a Lithium Niobate (LN) MEMS resonator. We “Etch-A-Sketch” a poling pattern on the membrane resonator that redefines the electro-mechanical coupling of the mechanical vibration modes. This technique introduces a new resonance peak at 681 MHz to the original un-poled admittance spectrum of the resonator. In add...

The purpose of this study was to compare physiological variables (i.e. oxygen consumption, blood lactate, heart rate, respiratory exchange ratio) during exercise on a double poling ergometer modified for sit skiers to a field test for the same skiers. Three male and four female athletes from the Canadian National / Developmental team (17-54 years of age, ranging in ability from a complete T7 sp...