Thermal properties D 3000 Giant Electrocaloric Effect in Thin-Film PbZr 0.95 Ti 0.05 O 3 . -Thin films of the title compound (350 nm) exhibit a giant electrocaloric effect of 0.48 K/V at 226°C near the ferroelectric Curie temperature (222°C) exceeding the previously best results obtained in bulk Pb0.99Nb0.02(Zr0.75Sn0.20Ti0.05)0.98O3 (0.003 K/V at 162°C). A large electrocaloric effect may find application in electrical refrigeration and could provide cooling solutions for electronic components such as computer chips. -(MISCHENKO*, A. S.; ZHANG, Q.; SCOTT, J. F.; WHATMORE, R. W.; MATHUR, N. D.; Sci.

a b s t r a c tThe electrochemical performances of fluorinated graphite have been improved by coating a uniform carbon layer on commercial CF x (x = 1) powder used as cathode material in lithium battery. In comparison with the cell using un-coated CF x as cathode, the cell using carbon coated CF x cathode has a higher energy density and higher power density, particularly at higher discharge current rates (1C above). This is because the conductive carbon coating provides the exterior connectivity between particles for facile electron conduction, resulting in high rate performance.

Thin Film Bulk Acoustic Wave Resonators (FBAR) using Lead Zirconate Titanate (PZT) thin films as the piezoelectric active layer will be favourable for voltage controlled oscillators and wide band filter due to the large electro-mechanical coupling coefficient of PZT. This paper reports the fabrication process and results of PZT FBARs and filters. The temperature coefficient and bias voltage effect are also presented.

Nanoindentation is a promising tool for obtaining the elastic properties of thin films. However, no means exists to predict or extrapolate the elastic modulus of the top layer in multilayer systems from experimental data. The mechanical properties of PZT multilayer systems have become increasingly important in applications for MEMS devices. The indentation modulus vs. a/t behaviour of PZT on Pt/SiO2/Si wafer substrate was investigated and compared with a new analytical solution for Herztian indentation of multilayers. Five different PZT film thicknesses were indented (70, 140, 400, 700, 1500 nm), using a 10 μm radius indenter. Good agreement was found between analytical equations and experimental data. However the behaviour of the multilayer system was complex. This makes the deconvolution of film properties difficult for thicknesses less than about 1000 nm.

The growth of polymeric particles during the hydrolysis and condensation of PbZr0.3Tio.703 (PZT 30/70) precursor solutions has been studied. At the beginning, particles grow by reaction between monomers and particles. As the particle number-density increases, particle-particle aggregation characterised by an exponential growth law becomes the predominant mechanism. When particles grow larger, toward gel formation, the aggregation changes to diffusion limited. Mathematical models derived according to the above mechanisms agreed well with measured particle growth profiles.