Download or read book Fabrication and Characterization of Barium Titanate Thin Film on Polycrystalline Nickel Substrate written by Parisa Sahebi and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectric BaTiO3 (BTO) thin films were deposited on polycrystalline nickel disks and silicon wafer substrates by rf magnetron sputtering. Nickel oxide (NiO) and nanocrystalline nickel (nc-Ni) layers were used as interfacial buffer layers. Microstructural studies with X-ray diffraction and transmission electron microscopy reveal that the BTO films deposited at temperatures lower than 700°C have an amorphous structure. However, the BTO films sputtered at temperatures higher than 700°C are partially crystalline. BTO films have a good and continuous interface with both interfacial layers with no interdiffusion or reaction with the substrates. In the case of BTO deposition with nc-Ni interlayer at higher deposition temperature of 800°C, a thin NiO layer forms between the nc-Ni and BTO films. Having nc-Ni as an interfacial layer enhances surface morphology and decreases surface roughness. This study shows that nc-Ni can act as a proper interfacial layer between a ceramic like BTO and the metallic substrates and is a better alternative for NiO buffer layer.

Download or read book Intrinsic and Substrate Dependent Properties of Polycrystalline Barium Titanate Thin Films written by Kenneth Morian Ring and published by . This book was released on 1999 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Properties of Barium Titanate Solid Solution Thin Films on Copper Substrates written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Barium titanate thin films were deposited via chemical solution deposition using a hybrid-chelate chemistry directly on copper foil substrates. A process was developed to crystallize and densify the ferroelectric films at 900C by using a reductive atmosphere containing nitrogen, hydrogen, water vapor, and oxygen impurities such that film constituents were oxidized to form barium titanate and the foil substrate remained metallic. The crystallized films are polycrystalline with equiaxed morphology and average grain diameters in excess of 100 nm. The dielectric properties exhibit permittivities in excess of 1800 at room temperature and zero bias with tunabilites of greater than 90% and high field loss tangents of less than 1%. A series of samples was prepared with varying grain and crystallite sizes by dividing and processing a single film over a range of temperature from 700 to 900C. This ensures that the chemical composition and film thickness is invariant for each sample. It is shown that the grain size increases with higher process temperatures and results in a concomitant increase in permittivity and tunability. These enhancements, combined with the constant paraelectricD erroelectric phase transition temperature, indicated that a combination of film crystallinity and grain size is responsible for diminished performance. The phase transition temperature and temperature coefficient of capacitance modified by partially substituting zirconium, hafnium, and tin for titanium. The resulting films were single phase and the phase transition shifts were consistent with bulk materials. A reduction in permittivity was observed for increasing substituent level and was attributed to a reduction in grain size for both barium titanate zirconate and barium titanate hafnate. Processing conditions were chosen to stabilize Sn2+ during the firing process in an attempt to flux the system and increase grain size. The barium titanate stannate films had less reduction in grain size.

Download or read book Fabrication and Evaluation of RF Sputtered Barium Titanate Thin Films written by I. H. Pratt and published by . This book was released on 1972 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural, chemical, dielectric, and ferroelectric (limited) characteristics of RF sputtered barium titanate (BaTiO3) are described. Primary interest was to determine film capability for providing high capacitance devices for hybrid and thin film integrated circuits. The extent of ferroelectric film behavior was also of concern for charge storage use in the development of thin film image plates for miniature solid state facsimile cameras. Metal-dielectric-metal capacitor structures incorporating amorphous or polycrystalline BaTiO3 films were fabricated and evaluated. (Author).

Download or read book Synthesis and Properties of Barium Titanate Solid Solution Thin Films on Copper Substrates written by Jon Fredrick Ihlefeld and published by . This book was released on 2006 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: hafnium, tin, zirconium, flux, copper, equilibria, grain size, size effects, sol-gel, barium titanate, film, ferroelectric, doping.

Download or read book Synthesis and Characterization of Batio3 Pellets and Thin Films written by Meor Ahmad Faris Meor Ahmad Tajudin and published by . This book was released on 2014 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Barium titanate was synthesized using a solid state approach and an aqueous method. Solid state syntheses were used to prepare barium titanate pellets using a powder metallurgy method. Appropriate amounts of barium carbonate and titanium dioxide powder were mixed together in an agate mortar. Barium titanate pellets were mixed according to 5 different ratios of Ba/Ti which are 1:0.9, 1:0.95, 1:1, 1:1.05, 1:1.1. Pellets were sintered in air at a temperature 1400 °C. Barium titanate thin films were prepared using an aqueous method. Sol-gel of barium titanate was prepared according to the similar ratios as pellets. Thin films of barium titanate sol-gel were deposited using a desktop printer onto a glass substrate and fired at 400 °C. Both pellets and thin films were characterized by X-ray diffraction, scanning electron microscope, Atomic Force Microscope (thin films only), and impedance spectroscopy. This thesis focuses on determination of dielectric properties of barium titanate including the resistance, capacitance, dielectric constant, relaxation frequency, and loss tangent. The highest density for the barium titanate pellets were 5.90 g/cm3 when a Ba:Ti ratio of 1:1 was used. The average thicknesses of the thin films were 2.89 nm as measured using the atomic force microscope and verified using the scanning electron microscope. Characteristic of barium titanate were observed under various temperatures starting from room temperature up to 450 °C (for pellets) and 300 °C (for thin films). The measured dielectric constant of the pellets at 10 kHz (at room temperature) varied from a maximum of 2810 to a minimum of 1375.

Download or read book Characterization of Chemically Synthesized Barium Titanate In the Forms of Powder Bulk and Thin Film Ceramics written by Weidong Zhu and published by . This book was released on 1995 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructural and Electrical Characterization of Barium Strontium Titanate Based Solid Solution Thin Films Deposited on Ceramic Substrates by Pulsed Laser Deposition written by Costas G. Fountzoulas and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectrics are multicomponent materials with a wealth of interesting and useful properties, such as piezoelectricity. The dielectric constant of the BSTO ferroelectrics can be changed by applying an electric field. Variable dielectric constant results in a change in phase velocity in the device allowing it to be tuned in real time for a particular application. The microstructure of the film influences the electronic properties which in turn influences the performance of the film. Ba(0.6)Sr(0.4)Ti(1-y)(A(3+), B(5+))(y)O3 thin films, of nominal thickness of 0.65 micrometer, were synthesized initially at substrate temperatures of 400 deg C, and subsequently annealed to 750 deg C, on LaAlO3 (100) substrates, previously coated with LaSrCoO conductive buffer layer, using the pulsed laser deposition technique. The microstructural and physical characteristics of the post-annealed thin films have been studied using x-ray diffraction, scanning electron microscopy, and nano indentation and are reported. Results of capacitance measurements are used to obtain dielectric constant and tunability in the paraelectric (T>Tc) regime.

Download or read book Electroceramics in Japan VIII written by Masaru Miyayama and published by Trans Tech Publications Ltd. This book was released on 2006-01-15 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). Japan is currently the most active country involved in carrying out research in. the rapidly expanding field of Electroceramics ; a field that has tremendous implications for a wide range of high-tech applications.

Download or read book Physical and Electrical Properties of Thin Film Barium Titanate Prepared by RF Sputtering on Silicon Substrate written by Galeb Hamid Maher and published by . This book was released on 1972 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Physical and Electrical Properties of Thin Film Barium Titanate Preparted by RF Sputtering on Silicon Substrate written by Galeb Hamid Maher and published by . This book was released on 1972 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ceramic Abstracts written by and published by . This book was released on 1999 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure of BaTiO3 written by Edward G. Grimsal and published by . This book was released on 1950 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solar Energy Update written by and published by . This book was released on 1983 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: