Volume 86, Issue 12, 15 December 1999
Index of content:
- DIELECTRICS AND FERROELECTRICITY (PACS 77)
86(1999); http://dx.doi.org/10.1063/1.371788View Description Hide Description
The piezoelectric constantmeasurement procedure is presented for sputteredlead zirconate titanate(PZT)thin filmsdeposited on silicon substrates. With a simple cantilever used in the direct piezoelectric effect, it is possible to measurepiezoelectric coefficients of unpoled and poled films. We discuss the poling treatment effects; applied electric field amplitude and duration on the piezoelectric response. We have registered a quasistatic piezoelectrichysteresis loop, and will show that the poling procedure can modify the symmetry of the hysteresis loop. The thin films were piezoelectric in a virgin state, which causes the offset of the piezoelectrichysteresis loops. The maximum remanent piezoelectric constant estimated for sputteredPZTthin film is −4 C/m2.
86(1999); http://dx.doi.org/10.1063/1.371789View Description Hide Description
In depositingthin films by using rf magnetron sputtering process, gas was used instead of oxygen as a reactive gas. In order to investigate an effect of this gas on the electrical and structuralproperties of the thin films, a various range of thicknesses from 1000 to 4000 Å was deposited on the Pt/Ti/Si(100) substrate at a substrate temperature of and then annealed in the range of for enhancement of the crystallinity. The ratio of Ar and gas was 9:1. There were no apparent differences in crystallographic orientation between and oxygen as reactive gases. However, the denser films were fabricated by using gas, and the electrical properties, i.e., remanent polarization, leakage currents and tan δ values were improved in the thinner films (1000 Å).
86(1999); http://dx.doi.org/10.1063/1.371790View Description Hide Description
Experimental and theoretical results for neutral barium petronate solutions in isopar L are reported. The experimental techniques are novel in that they include the use of ac conductivity measurements during transient depletion and recovery. Use is made of a one-dimensional numerical model to extract actual ion mobilities. Deviations from a one-dimensional theoretical model are shown to be due to a fluid instability which grows in the highly stressed space charge regions near the electrodes. This instability is examined theoretically and is shown quantitatively to have a predictable electrohydrodynamic origin. Furthermore, suspended particles are used to confirm the existence of unstable motion, and also to unambiguously determine the polarity of ions associated with each mobility. Under subsequent zero bias, recovery of the solutions from nearly complete depletion is shown to originate at the solid surfaces of the test cell.