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Polycrystalline sample of Ba4Gd2Fe2Nb8O30 ceramics were prepared by a high temperature solid-state reaction technique. The structure and dielectric properties as well as the behavior of ferroelectric phase transition have been investigated. The dielectric spectra are characterized in wide frequency (40 Hz-1 MHz) and temperature (25degC-600degC). At 1MHz, the room temperature dielectric constant of...
0.95Pb(Sc0.5Ta0.5)O3-0.05PbTiO3(PSTT5) thin films were prepared on LaNiO3(LNO)/SiO2/Si substrate by RF sputtering technology. After sputtering, the PSTT5 thin films were annealed by normal one-step rapid thermal annealing (OSRTA) or a renovation of two-step rapid thermal annealing (TSRTA). The PSTT5 films annealed by TSA show high (100) orientation, high phase purity, sufficient crystallization and...
(1-x)Pb(Sc0.5Ta0.5)O3-xPb(Zr0.52Ti0.48)O3 (PSTZT-100x) ceramics were prepared by using conventional oxide processing, and their piezoelectric and ferroelectric properties studied. The results of X-ray diffraction (XRD) suggest that PSTZT-100x ceramics formed a single-phase perovskite structure when 0.1=x=0.8. The ceramics exhibit relatively good piezoelectric and ferroelectric properties: piezoelectric...
(1-x)PbFe0.5Ta0.5O3-xPbTiO3 (PT) solid solution systems were prepared by a solid state reaction method. With increasing PbTiO3, the phase transition temperature Tc linearly increased, and the corresponding dielectric behavior changed from a relaxor ferroelectrics to a normal ferroelectrics. One of them, the relaxor behavior of the 0.8PFT-0.2PT ceramics with x = 0.2 were observed at Tc = 64degC. The...
Heterostructures of thin-film perovskite ferroelectrics and relaxors were grown by in situ pulsed laser deposition on La0.5Sr0.5CoO3/MgO and Pt/sapphire. The dielectric response of the heterostructures was measured as a function of frequency, temperature, amplitude of ac field, magnitude of dc field, and varying the measurement rate. In the ferroelectric state, the existence of ferroelectric domains...
(1-x)Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ (PMN-PT) and (1-x)Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ (PZN-PT) single crystals are considered to behave like soft Pb(Zr,Ti)O/sub 3/ (PZT) ceramics because of their small mechanical quality factor Q/sub m/ and poor stability under external disturbances (Q/sub m/ > 500-1000 for hard PZT ceramic, and Q/sub m/ < 100 for soft PZT...
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