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2006 15th ieee international symposium on the applications of ferroelectrics

July 30 2006-Aug. 3 2006

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Displaying Results 1 - 25 of 29
  • Impedance Spectroscopy of Mn-Doped BiFeO3-PbTiO3 Ceramics

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1800 KB)

    BiFeO3-PbTiO3-based materials have the potential to be used as high temperature piezoelectrics and are candidate multiferroic materials. Two drawbacks are the significant conductivity and the apparently low mobility of ferroelastic domain walls. Both may be influenced by aliovalent doping. Here we have investigated a number of B-site dopants, including manganese, plus B-site ... View full abstract»

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  • Synthesis, Structure and Properties of Pulsed Laser Deposited BiFeO3-PbTiO3 Thin Films

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    Bismuth ferrite lead titanate (BFPT) films of composition xBiFeO3 - (1-x)PbTiO3, with x from 0 to 1, have been deposited on platinised silicon substrates employing pulsed laser deposition under various temperatures and oxygen pressures. Dense, high quality films were deposited at 530°C with 150 mTorr oxygen pressure. The crystal structure and orientation of the films has bee... View full abstract»

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  • Fabrication and Characterization of ZnO Films for Biological Sensor Application of FPW Device

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (979 KB)

    Flexural plate wave (FPW) device has great potential for biological sensor application due to 1) isolation of its electric circuit from the medium being investigated, 2) low acoustic energy loss in liquid medium, and 3) simpler oscillator circuit design. Since FPW device can be fabricated onto silicon-based substrates by micromachining technology, it offers batch processing for economic sensor fab... View full abstract»

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  • Sol-gel derived lead-free piezoelectric Bi1/2Na1/2TiO3 thin film for MEMS applications

    Publication Year: 2006, Page(s):1 - 3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Bi1/2Na1/2TiO3 (abreviated as BNT) is considered as a promising lead-free piezoelectric material for sensor and actuator applications. In this study, we demonstrate an improved sol-gel process using rapid thermal annealing (RTA). Our results indicate that thermal annealing in an oxygen atmosphere after each layer of coating is effective in promoting crystallization... View full abstract»

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  • High Strain and Piezoelectric Characteristics of Textured Bi0.5(Na0.85K0.15)0.5TiO3 Ceramics

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1268 KB)

    The anisotropy of polarization and strain behavior in textured Bi0.5(Na0.85K0.15)0.5TiO3 ceramics are investigated for lead-free piezoelectric ceramics actuators. The textured Bi0.5(Na0.85K0.15)0.5TiO3 ceramics are fabricated by reactive templated grain growth (RTGG) using plate-like Bi... View full abstract»

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  • Development of Lead-Free PTC Thermistor Materials

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1704 KB)

    The electric properties of bismuth- and sodium-modified barium titanate, Ba1-x(Bi1/2Na1/2)x TiO3 (BBNT) were studied as a lead-free PTC (positive temperature coefficient of resistivity) thermistor material usable over 130°C. Two semiconductorization processes and their electric properties are described. Lanthanum(La)-doped BBNT ceramics sinte... View full abstract»

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  • Growth of Silver Lithium Niobate Single Crystals and Their Piezoelectric Properties

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2508 KB)

    Silver lithium niobate (Ag0.9Li0.1Nb0.3, ALN10) single crystals were grown by a slow cooling method without flux under oxygen flow. By optimizing growth conditions, the ALN10 crystals with sizes of ca. 30 mm cube were successfully grown. Its crystal symmetry was investigated by high energy X-ray diffraction, and the space group at 24°C was assigned to the ferroele... View full abstract»

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  • Lead-Free Piezoelectric Ceramics vs. PZT?

    Publication Year: 2006, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    Investigations in the development of lead-free piezoelectric ceramics have recently claimed properties comparable to that of PZT-based materials. In this work, the dielectric and piezoelectric properties of the various systems were contrasted in relation to their respective Curie temperatures. Though comparable with respect to TC, enhanced properties reported in the K,NaNbO3 ... View full abstract»

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  • Piezoelectric Micromachined Ultrasonic Transducers based on PZT films

    Publication Year: 2006, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    Piezoelectric micro machined ultrasonic transducers (pMUT) are piezoelectric laminated plates operating at flexural modes. The pMUT's fabricated in this work contained a 4 ¿m thick lead zirconate titanate (PZT) thin film deposited by a sol-gel technique, and exhibiting a permittivity of ¿r= 1200, and an effective transverse piezoelectric coefficient e31,f of 12 C/m... View full abstract»

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  • Relaxor Ferroelectric 0.2PZN-0.8PZT(53/47) Thick Films Fabricated Using a MOD Process

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    Crack free peroviskite 0.2PZN-0.8PZT (53/47)) thick films up to 6.8 ¿m were prepared by a metallic-organic decomposition (MOD) process on platinum coated titanium (Pt/Ti) foil substrates by a dipping coating technique. The thick film exhibits a pure perovskite phase structure with dense and uniform microstructure. The dielectric, ferroelectric and piezoelectric properties of the thick film have b... View full abstract»

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  • PZT Films on Wafers and Fibers for MEMS Application

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1550 KB)

    A single PZT metallic target has been utilized to deposit lead zirconate titanate (PZT) films by DC pulsed magnetron sputtering on Ti/Pt(111)/Ti coated Si wafer and on Au coated glass fibers. Multicrystalline PZT films were obtained after post treatment by conventional (CA) and rapid thermal annealing (RTA) at 650°C in air and vacuum. The influences of both post-annealing treatments on the film p... View full abstract»

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  • A Micro Ultrasonic Scalpel Using Hydrothermal PZT Thin Film

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1462 KB)

    A transducer for a micro ultrasonic scalpel has been fabricated. The micro ultrasonic scalpel can be used with an endoscope for a non-abdominal operation or micro surgery, for example, through a microscope. The ultrasonic transducer was 9.8 mm long and 2.7 mm wide and has stepped horn to amplify vibration velocity; tip of the horn is 0.6 mm wide. The scalpel vibrated in longitudinal mode at about ... View full abstract»

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  • Cross-Sectional Imaging of Polarization Reversal in Ferroelectric Films

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1291 KB)

    Polarization reversal in Pb(Zr,Ti)O3 ferroelectric films was followed by a novel technique of cross-sectional piezoelectric force microscopy (PFM). Instead of the traditional scanning of the top surface of ferroelectric thin films, the domain structure across the cross section is visualized. The probing AC electric field is applied to the capacitor structure between top and bottom elect... View full abstract»

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  • Nanodomain Manipulation for Ferroelectric Data Storage with High Recording Density, Fast Domain Switching and Low Bit Error Rate

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1422 KB)

    Recording density, domain switching time and bit error rate were evaluated using a data storage system based on scanning nonlinear dielectric microscopy. Congruent lithium tantalate single crystals with the thickness less than 50 nm were used as recording media. Local domain switching was carried out by applying voltage pulse on the recording media using a conductive cantilever. Close-packed domai... View full abstract»

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  • Spatial Resolution and Measurement Accuracy of Dielectric Microscope Using Non-contact State Microwave Probe

    Publication Year: 2006, Page(s):1 - 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    The dielectric measurement for microscopic area of multi-layer ceramics capacitor was carried out by microwave microscope using non-contact microwave probe. The phase of incidence microwave for sample was fixed to ¿2 in order to realize accurate measurement of sample. The spatial resolution for dielectric measurement was increased based on Kirchhoff's diffraction theory with decreasing coaxial ca... View full abstract»

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  • Application of Acoustical Activity in Lithium Niobate Crystals for Control of Light Intensity

    Publication Year: 2006, Page(s):1 - 3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    New technology is offered for measuring and control of light intensity. In the proposed method the phenomenon of acoustical activity and Bragg light diffraction on hypersonic waves in ferroelectric crystal LiNbO3 is used. Control of light intensity can be realized by transference of crystal or by modification of generator frequency by which the transverse acoustic wave is excited. The c... View full abstract»

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  • Domains Inversion in LiNbO3 Using Electron Beam Irradiation for Phononic Crystals

    Publication Year: 2006, Page(s):1 - 3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (994 KB)

    We report here, the study of domain inversion in lithium niobate (z-cut) by electron beam irradiation without any static bias associated to wet etching, in view of the fabrication of phononic crystals. The inverted domains are revealed by HF-etching taking advantage of the large difference in etching rate between z+ and z-faces. A pertinent choice of irradiation conditions such as accel... View full abstract»

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  • Ferroelectric Relaxor Terpolymers: Properties and Potential Applications

    Publication Year: 2006, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1841 KB)

    Ferroelectric materials are intrinsically multifunctional and have found a broad range of applications. A new class of semicrystalline terpolymers comprising vinylidene fluoride (VDF), trifluoroethylene (TrFE), and 1,1-chlorofluoroethylene (CFE), were prepared at the Institut Franco-Allem and de Recherches in Saint-Louis (ISL) via a suspension polymerization process. Relevant studies and results s... View full abstract»

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  • Piezoelectric Micromachined Ultrasonic Transducers Based on P(VDF-TrFE) Copolymer Thin Films

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1131 KB)

    Representing a new approach to ultrasound generation and detection, study on piezoelectric micromachined ultrasonic transducers (pMUTs) has been a growing research area in recent years. Intensive research work has been directed on the deposition of lead zirconate titanate (PZT) films on silicon substrates for their excellent piezoelectric coefficients and electromechanical coupling coefficients. H... View full abstract»

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  • Electrical characteristics of organic ferroelectric FET integrated with Si using P(VDF-TrFE) copolymer films for nonvolatile memory devices

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2058 KB)

    The feasibility of nonvolatile memory (NvRAM) structure with nondestructive readout (NDRO) capability based on Si-MOSFET integrated with a ferroelectric polyvinylidene fluoride trifluoroethylene copolymer (P(VDF-TrFE)) as a gate along with SiO2 buffer has been demonstrated. Measurement of channel current IDS shows no saturation due to uniform ferroelectric field across gate c... View full abstract»

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  • Embedded FeRAM Challenges in the 65-nm Technology Node and Beyond

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    To embedded ferroelectric random access memories in the 65-nm CMOS and beyond, three-dimensional structure and low-temperature formation have been developed. View full abstract»

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  • Ferroelectric Gate on AlGaN/GaN Heterostructures

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (961 KB)

    A PZT, Pb(Zr,Ti)O3 (40:60), ferroelectric layer has been successfully deposited onto a Al0.3Ga0.7N/GaN heterostructure with a 2DEG, two dimensional electron gas. Due to the chemical and temperature stability of AlGaN/GaN it was possible to implement the concept of field-effect transistor with ferroelectric gate. The high temperature perocessing conditions for PZT w... View full abstract»

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  • Atomic Layer Deposition of Pb(Zr,Ti)Ox, Thin Films by a Combination of Binary Atomic Layer Deposition Processes

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1433 KB)

    After an evaluation of Zr precursor, quatemary Pb(Zr,Ti)Ox [PZT] films were prepared by a combination of binary atomic layer deposition (ALD) processes. ZrOx films were deposited on Pt/TiOx/SiOx/Si substrates using liquid injection ALD. Zr(C11H19O2)4 [Zr(DPM)4] dissolved in ethylcyclohexane (ECH) wit... View full abstract»

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  • Nonlinear Dielectric Properties of (Ba0.60, Sr0.40)TiO3 Thin Films with Anisotropic Epitaxy

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    Nonlinear dielectric response of (Ba0.60 Sr0.40)TiO3 epitaxial films on ≪100≫ and ≪110≫-oriented NdGaO3 substrates were investigated as a function of film thickness. The second, fourth and sixth order permittivities were determined at 10 GHz and at room temperature from which the so-called critical field for maximum tunability... View full abstract»

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  • Electrocaloric Effect In Relaxor Ferroelectric Ceramics and Single Crystals

    Publication Year: 2006, Page(s):1 - 4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1288 KB)

    In the last two decades, the electrocaloric (EC) effect which is associated to the temperature (¿) dependence of the macroscopic polarization P(E,¿) under electric field E has been spasmodically studied in ferroelectric materials in order to find an alternative to the classical refrigeration devices using freon. Basically, large electrocaloric temperature variation ¿¿ originates from electric ... View full abstract»

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