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AbstractAbstract
[en] Compositionally graded BaxSr1-xTiO3 (BST) thin films (from x=0.7 to 1) were fabricated for high frequency tunable applications using a modified sol-gel technique. The structure, surface morphology and compositional gradient of the films were characterised by glancing incidence X-ray diffraction (XRD), atomic force microscopy and Rutherford backscattering. The small signal dielectric constant (εr) and dielectric loss (tan δ) at 100 kHz were found to be 520 and 0.03. Dielectric constant and dielectric loss are relatively stable in a wide range of temperature. Dielectric properties change significantly with applied dc bias field and the graded thin film show high tunability of 40% at an applied field of 230 kV cm-1
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Source
S0254058402002559; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Country of publication
ALKALINE EARTH METAL COMPOUNDS, COHERENT SCATTERING, DIELECTRIC PROPERTIES, DIFFRACTION, ELECTRICAL PROPERTIES, ELECTROMAGNETIC RADIATION, FILMS, FREQUENCY RANGE, KHZ RANGE, MATERIALS, MICROSCOPY, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, RADIATIONS, SCATTERING, SPECTROSCOPY, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] Indium nitride (InN) thin films have been deposited on Si(1 0 0) and Pt(1 1 1)/Ti/SiO2/Si(1 0 0) substrates by reactive r.f. magnetron sputtering. By using a plasma power of 25 W, nitrogen gas pressure of 5-7 mTorr and substrate temperature of 300-400 deg. C, InN films with (0 0 0 2) orientation were obtained. The relative permittivity and electrical resistivity of the InN film were calculated from the measured electrical impedance. The piezoelectric coefficient d33 of the InN film was measured by a heterodyne interferometer and found to be 3.12±0.10 pm V-1
Primary Subject
Source
S0040609003008897; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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CHALCOGENIDES, DIELECTRIC PROPERTIES, ELECTRICAL PROPERTIES, ELECTRICITY, ELECTRON TUBES, ELECTRONIC EQUIPMENT, ELEMENTS, EQUIPMENT, FILMS, INDIUM COMPOUNDS, MEASURING INSTRUMENTS, MICROWAVE EQUIPMENT, MICROWAVE TUBES, NITRIDES, NITROGEN COMPOUNDS, NONMETALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PNICTIDES, SILICON COMPOUNDS, TEMPERATURE RANGE
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AbstractAbstract
[en] A comparison experiment was designed and carried out to study the influence of electroless nickel plating on ZnO-based ceramic varistors. It was found that the influence was not caused by permeation of the plating solution; the influence was directly related to nickel deposition. It is proposed that adsorbed hydrogen atoms generated in electroless plating can diffuse into ZnO ceramic varistors and undergo a reduction reaction with them, which result in a substantial increase in the leakage current of the varistors. Some implications for the influence of electroplating on I-V characteristics and for the long-term degradation of ZnO varistors are also discussed, in which much attention is paid to the reduction reaction of atomic hydrogen generated by electrolysis of water
Source
IUMRS-ICEM2002 - Symposium N: 8. IUMRS international conference on electronic materials; Xi'an (China); 10-14 Jun 2002; S0921510702005676; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Literature Type
Conference
Journal
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology; ISSN 0921-5107; ; CODEN MSBTEK; v. 99(1-3); p. 70-73
Country of publication
CHALCOGENIDES, CURRENTS, DEPOSITION, DISPERSIONS, ELECTRIC CURRENTS, ELECTRICAL EQUIPMENT, ELECTRICAL PROPERTIES, ELECTRODEPOSITION, ELECTROLYSIS, ELEMENTS, EQUIPMENT, EVALUATION, HOMOGENEOUS MIXTURES, HYDROGEN COMPOUNDS, LYSIS, METALS, MIXTURES, NONMETALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PLATING, RESISTORS, SEMICONDUCTOR DEVICES, SOLUTIONS, SURFACE COATING, TRANSITION ELEMENTS, ZINC COMPOUNDS
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AbstractAbstract
[en] Ferroelectric (Pb0.76Ca0.24)TiO3 (PCT) thin films were grown on LaNiO3 (LNO) coated Si(1 1 1) and fused quartz substrates by using a sol-gel process. The highly (1 0 0)-oriented PCT films on LNO coated Si(1 1 1) substrates, and random oriented pervoskite PCT thin films on fused quartz substrates have been obtained, respectively. Atomic force microscopy (AFM) revealed that the surface morphology smooth. PCT films on LNO coated Si(1 1 1) and fused quartz substrates, the grain sizes were about 60-120 and 40-60 nm, respectively. The PCT thin films on LNO coated Si(1 1 1) and fused quartz substrates annealed at 600 deg. C have the remanent polarization (Pr) and coercive electric field (Ec) values were 9.3 μC/cm2 and 64 kV/cm, 1.4 μC/cm2 and 28 kV/cm, respectively. At 100 kHz, the dielectric content and dielectric loss of the PCT films on LNO coated Si(1 1 1) and fused quartz substrates were 231 and 0.045, 160 and 0.061, respectively
Source
S0169433202012199; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Ba(Ti0.95Zr0.05)O3 (BTZ) thin films grown on Pt/Ti/SiO2/Si(100) substrates were prepared by chemical solution deposition. The structure and surface morphology of BTZ thin films has been studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). At 100 kHz, the dielectric constant and dissipation factor of the BTZ film are 121 and 0.016, respectively. The ellipsometric spectrum of the BTZ thin film annealed at 730 deg. C was measured in the range of wavelength from 355 to 1700 nm. Assuming a five-layer model (air/surface roughness layer/BTZ/interface layer/Pt) for the BTZ thin films on platinized silicon substrates, the optical constant spectra (refractive index n and the extinction coefficient k) of the BTZ thin films were obtained
Primary Subject
Source
S0040609004001233; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
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ANNEALING, BARIUM COMPOUNDS, DEPOSITION, DIELECTRIC MATERIALS, DISSIPATION FACTOR, KHZ RANGE 100-1000, LAYERS, OXIDES, PERMITTIVITY, PLATINUM, REFRACTIVE INDEX, SCANNING ELECTRON MICROSCOPY, SILICON, SILICON OXIDES, SOLUTIONS, THIN FILMS, TITANIUM, TITANIUM COMPOUNDS, X-RAY DIFFRACTION, ZIRCONIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS, CHALCOGENIDES, COHERENT SCATTERING, DIELECTRIC PROPERTIES, DIFFRACTION, DISPERSIONS, ELECTRICAL PROPERTIES, ELECTRON MICROSCOPY, ELEMENTS, FILMS, FREQUENCY RANGE, HEAT TREATMENTS, HOMOGENEOUS MIXTURES, KHZ RANGE, MATERIALS, METALS, MICROSCOPY, MIXTURES, OPTICAL PROPERTIES, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PLATINUM METALS, SCATTERING, SEMIMETALS, SILICON COMPOUNDS, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS
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AbstractAbstract
[en] Samarium- and manganese-doped lead titanate (Pb0.85Sm0.1Ti0.98Mn0.02O3, PSmT) ceramic powder was prepared by sol-gel method. The particle size of the sol-gel powder was about 250 nm. PSmT ceramics were also fabricated from the fine powder. The sintering temperature of these ceramics was lower than that of the ceramics made from mixed oxides. The X-ray diffraction patterns show that the ceramics have a pure tetragonal crystal structure. The c and a of the unit cell were 4.068 and 3.897 Angst, respectively. The piezoelectric and dielectric properties were measured by using an impedance analyzer and a d33 meter. The dielectric permittivity, piezoelectric constant and thickness electromechanical coupling coefficient kt of the ceramics were 180, 51 and 0.44 pC N-1, respectively. The planar electromechanical coupling coefficient kp value was lower than 0.05
Primary Subject
Source
S0254058404001026; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Lead zirconate titanate (PZT) piezoelectric ceramics were driven in a resonant mode at various power levels. The stability of the PZT piezoelectric ceramics is found to depend greatly on the driving power level. At low driving power, the ceramics are very stable and the properties remain unchanged after continuous vibration for long periods of time. When the driving power is relatively high, however, an obvious temperature rise is observed in the ceramics during vibration and serious degradation occurs to the properties of the ceramics after some periods of continuous vibration. As the properties of the degraded ceramics are restored after an ageing process, it is proposed that high power resonant driving causes a de-ageing effect on PZT piezoelectric ceramics, which leads to degradation. The heat generated in PZT ceramics by driving with relatively high power is proved to play a vital role in the de-ageing effect
Source
IUMRS-ICEM2002 - Symposium N: 8. IUMRS international conference on electronic materials; Xi'an (China); 10-14 Jun 2002; S0921510702005226; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology; ISSN 0921-5107; ; CODEN MSBTEK; v. 99(1-3); p. 203-206
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AbstractAbstract
[en] Nb-doped BaTiO3 semiconducting ceramics have been prepared at 1150 deg. C by employing YB6 as the sintering aid. The low-temperature sintered samples exhibit a positive temperature coefficient of resistivity (PTCR) effect. The room-temperature resistivity and the magnitude of PTCR effect depend on the amount of YB6 added, the Nb2O5 content and the sintering conditions. At 1 mol% of YB6, the sample has a low room-temperature resistivity and a resistivity jump of about 104. Transmission electron microscope studies revealed that the intergranular region between the crystalline BaTiO3 grains has an amorphous structure. Y, Ba and Ti are present in the intergranular region but no Y is detectable in the crystalline grains. A liquid phase is believed to be present during sintering and it helps to facilitate the densification process and to enhance the PTCR effect
Source
S0921510703001181; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology; ISSN 0921-5107; ; CODEN MSBTEK; v. 100(3); p. 286-291
Country of publication
ALKALINE EARTH METAL COMPOUNDS, BORON COMPOUNDS, CHALCOGENIDES, ELECTRICAL PROPERTIES, ELECTRON MICROSCOPY, FABRICATION, FLUIDS, MATERIALS, MICROSCOPY, MICROSTRUCTURE, NIOBIUM COMPOUNDS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, REACTIVITY COEFFICIENTS, REFRACTORY METAL COMPOUNDS, SEMICONDUCTOR DEVICES, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] A thin rectangular bar-shaped bilayer piezoelectric step-up transformer operating in the bending vibration mode is described and its characteristics are investigated. It consists of two lead zirconate titanate ceramic plates (32x8x1.5 mm3) with a high mechanical quality factor. The transformer has a symmetric structure in the length direction with the polarization aligned in the thickness direction. It has 2 input parts and 1 output part. The inputs are located at both ends of the length of the transformer with bilayer structures and the output is located at the centre portion with a single layer structure. When connecting a matching load resistance of 1.2 kΩ to the output terminal, the efficiency reaches 85% and the voltage gain is 5.5 at a driving frequency of 205 kHz. By using this bilayer structure, a piezoelectric transformer with bending vibration mode has been realized
Source
IUMRS-ICEM2002 - Symposium N: 8. IUMRS international conference on electronic materials; Xi'an (China); 10-14 Jun 2002; S0921510702004725; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology; ISSN 0921-5107; ; CODEN MSBTEK; v. 99(1-3); p. 164-167
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AbstractAbstract
[en] By using 1-3 composite rings to replace the ceramic rings in a Langevin sandwich transducer, the non-axial and many other spurious resonances in the transducer are suppressed, and only the axial resonance modes are retained. In this study, a combination of ceramic and 1-3 composite rings, referred to as a hybrid structure, was used as the driving element to improve the performance of the transducer. Sixty-kilohertz pre-stressed sandwich transducers with hybrid structures were constructed. Various relative placements of the ceramic and composite rings in the transducers were studied in order to optimize the transducer performance and the results are discussed. The damping effects in the composite rings were evaluated from the axial vibration displacements measured by a laser vibrometer. Characteristics of hybrid transducers were compared with the full ceramic and full composite transducers. A symmetric structure in the hybrid transducer is found to be most effective for the fundamental and harmonic mode operations
Source
IUMRS-ICEM2002 - Symposium N: 8. IUMRS international conference on electronic materials; Xi'an (China); 10-14 Jun 2002; S0921510702004397; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology; ISSN 0921-5107; ; CODEN MSBTEK; v. 99(1-3); p. 6-10
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