Download or read book Microstructure and Electrical Property Characterization of Barium Strontium Titanate Thin Films Prepared by a Sol gel Technique for Dram Capacitor Applications written by Danielle Marie Tahan and published by . This book was released on 1997 with total page 352 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 Synthesis Characterization and Applications of Barium Strontium Titanate Thin Film Structures written by Supriya Ashok Ketkar and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Barium Strontium Titanate (BST) based ferroelectric thin film devices have been popular over the last decade due to their versatile applications in tunable microwave devices such as delay lines, resonators, phase shifters, and varactors. BST thin films are promising candidates due to their high dielectric constant, tunability and low dielectric loss. Dielectric-tunable properties of BST films deposited by different deposition techniques have been reported which study the effects of factors, such as oxygen vacancies, film thickness, grain size, Ba/Sr ratio, etc. Researchers have also studied doping concentrations, high temperature annealing and multilayer structures to attain higher tunability and lower loss. The aim of this investigation was to study material properties of Barium Strontium Titanate from a comprehensive point of view to establish relations between various growth techniques and the film physical and electrical properties. The primary goal of this investigation was to synthesize and characterize RF magnetron sputtered Barium Strontium Titanate (Ba1-xSrxTiO3), thin film structures and compare their properties with BST thin films deposited by sol-gel method with the aim of determining relationships between the oxide deposition parameters, the film structure, and the electric field dependence. In order to achieve higher thickness and ease of fabrication, and faster turn around time, a [grave]stacked' deposition process was adopted, wherein a thin film (around 200nm) of BST was first deposited by RF magnetron sputtering process followed by a sol-gel deposition process to achieve higher thickness. The investigation intends to bridge the knowledge gap associated with the dependence of thickness variation with respect to the tunability of the films. The film structures obtained using the three different deposition methods were also compared with respect to their analytical and electrical properties.

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1996 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructure and Nonstoichiometry of Barium Strontium Titanate Thin Films for Dram Applications written by and published by . This book was released on 1999 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper we investigate the microstructural accommodation of nonstoichiometry in (Ba(subscript x)Sr{sub 1-x}Ti{sub 1+y}O{sub 3+z}) thin films grown by chemical vapor deposition. Films with three different (Ba+Sr)/Ti ratios of 49/51 (y=0.04 in the notation of the formula above), of 48/52 (y=0.08) and of 46.5/53.5 (y=O.15), were studied. High-resolution electron microscopy is used to study the microstructure of the BST films. High-spatial resolution electron energy-loss spectroscopy (EELS) is used to reveal changes in chemistry and local atomic environment both at grain boundaries and within grains as a function of titanium excess. We find an amorphous phase at the grain boundaries and grain boundary segregation of excess titanium in the samples with y=0.15. In addition, EELS is also used to show that excess titanium is being partially accommodated in the grain interior. Implications for the film electrical and dielectric properties are outlined.

Download or read book Processing and electrical characterization of barium strontium titanate thin films for ULSI DRAM application written by Shylaja Katakam and published by . This book was released on 1998 with total page 156 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 2240 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 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Lead Strontium Titanate Thin Films by Sol gel Method written by Yi-Shih Chiu and published by . This book was released on 2005 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth and Characterization of Barium Strontium Titanate Thin Films with Enhanced Electrical Properties Using Pulsed Laser Deposition written by Anuranjan Srivastava and published by . This book was released on 1999 with total page 132 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 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strain Sensing Properties of Barium Titanate and Barium Strontium Titanate Thin Films Prepared by a Sol gel Techniques written by Pavarit Promsena and published by . This book was released on 2010 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have fabricated strain gauges from dielectric materials, barium titanate (BaTiO3) and barium strontium titanate (BaSrTiO3), depositing on flexible borosilicate glasses substrates using a sol-gel method. The coplanar capacitors were patterned on the surface of the films using a DC sputtering technique. The measurement of the strain on a cantilever spring made from capacitor arrays were obtained by monitoring the changing of capacitance of the dielectric films. A parallelogram clamp and a piezoelectric actuator were used for supporting the device under test as well as for the application of strain. The capacitive strain gauge was connected to the oscillator circuit via wire bonding. The changing of capacitance in capacitive strain gauge was done by applying the force with eleven values. The deflection of the beam cantilever was indicated by a dial micrometer. Also, the capacitors were diced individually to 3x5 mm and the capacitance measurements were taken as a function of Sr composition of Ba[subscript x] Sr[subscript1- x] TiO3 and frequency with an LCR meter. The dielectric constant decreased as a function of frequency in the range of 100-1100 kHz and the maximum dielectric constant of Ba[subscript x] Sr[subscript1- x] TiO3 films was found to be 482 at x = 0.35.

Download or read book International Conference on Thin Film Physics and Applications written by and published by . This book was released on 2000 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fabrication and Characterisation of Sol gel Based Barium Gadolinium Titanate Thin Films for Photovoltaics written by Yen Chin Teh and published by . This book was released on 2018 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this researchare summarized as below ; to fabricate Barium Gadolinium Titanate (BGT) thin films with perovskite structure using the sol-gel method ; to investigate the basic properties of the BGT film including structural, surface morphology, optical response and electric properties of the films ; to study the feasibility of the BGT film for photovoltaic application.

Download or read book Investigation of Resistive Switching in Barium Strontium Titanate Thin Films for Memory Applications written by Wan Shen and published by Forschungszentrum Jülich. This book was released on 2010 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sol Gel Derived Ferroelectric Thin Films for Voltage Tunable Applications written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectric perovskite thin films for voltage tunable applications, namely (Ba, Sr)TiO3 (Barium Strontium Titanate or BST) and (Pb, Sr)TiO3 (Lead Strontium Titanate or PST), are synthesized via the so-called sol-gel route. While BST shows the tendency to severe film cracking, PST can be grown crack free onto platinised Si standard substrates and even directly onto SiO2, SiNx or bare Si. The growth kinetics of PST on platinised SiO2/Si and directly on SiO2/Si are studied in detail using X-ray diffractometry (XRD), scanning electron and atomic force microscopy, SEM and AFM respectively. It is shown that PST begins to crystallise at 500°C on Ti/Pt and 550°C directly on SiO2. After a thermal treatment of 650°C for 15 min both films are fully crystallised with random (100) and (110) orientation and a smooth surface. The dielectric properties, e.g. dielectric constant, loss and tunability, of PST 50/50 are measured using a standard Ti/Pt bottom electrode with Cr/Au top electrodes and a TiW/Cu bottom electrode on which the PST thin film was bonded with TiW/Cu top electrodes. The Cu/PST/Cu system shows an enhanced performance in terms of loss resulting in a larger device quality factor and a figure of merit (FOM) of 18.25 compared to 16.6 for the configuration using a Pt bottom electrode. The maximum tunability is 73% with an applied voltage of 35V and the dielectric constant at zero bias is ~ 420 with a loss

Download or read book Processing Science of Barium Titanate 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 and barium strontium titanate thin films were deposited on base metal foils via chemical solution deposition and radio frequency magnetron sputtering. The films were processed at elevated temperatures for densification and crystallization. Two unifying research goals underpin all experiments: 1) To improve our fundamental understanding of complex oxide processing science, and 2) to translate those improvements into materials with superior structural and electrical properties. The relationships linking dielectric response, grain size, and thermal budget for sputtered barium strontium titanate were illustrated. (Ba0.6Sr0.4)TiO3 films were sputtered on nickel foils at temperatures ranging between 100-400 Ã'°C. After the top electrode deposition, the films were co-fired at 900 Ã'°C for densification and crystallization. The dielectric properties were observed to improve with increasing sputter temperature reaching a permittivity of 1800, a tunability of 10:1, and a loss tangent of less than 0.015 for the sample sputtered at 400 Ã'°C. The data can be understood using a brick wall model incorporating a high permittivity grain interior with low permittivity grain boundary. However, this high permittivity value was achieved at a grain size of 80 nm, which is typically associated with strong suppression of the dielectric response. These results clearly show that conventional models that parameterize permittivity with crystal diameter or film thickness alone are insufficiently sophisticated. Better models are needed that incorporate the influence of microstructure and crystal structure. This thesis next explores the ability to tune microstructure and properties of chemically solution deposited BaTiO3 thin films by modulation of heat treatment thermal profiles and firing atmosphere composition. Barium titanate films were deposited on copper foils using hybrid-chelate chemistries. An in-situ gas analysis process was developed to probe the organic removal and.