Download or read book Fabrication and Characterization of BSTO and Nonferroelectric Oxide Composites for Use in Phased Array Antennas and Other Electronic Devices written by and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ceramic ferroelectric phase shifting device has been demonstrated using Ba(1-x)Sr(x)TiO3 (BSTO) ceramics. As a part of an effort to optimize the electronic device performance in the phase shifter, various composites of BSTO combined with other nonelectrically active oxide ceramics have been formulated. In general, the composites have reduced dielectric constants, epsilon', where epsilon = epsilon' = i(epsilon)', and loss tangents, tan delta. The low dielectric constant and low loss tangent reduce the overall impedance mismatch and the insertion loss of the device, In addition, the overall tunability, change in the dielectric constant with applied voltage, is maintained at a relatively high level. The combination of electronic properties of these materials offer substantially higher operating frequencies, 10 GHz and above. Another application for one of the composites is for use as a capacitor-varistor surge protector. The microstructures including grain size and phase analysis have been examined using SEM and X-ray diffraction. The analysis of the phase formation, compositional variations, and grain size will be related to the electronic properties of the materials. (jg).

Download or read book Fabrication and Characterization of Barium Strontium Titanate and Non ferroelectric Oxide Composites written by and published by . This book was released on 1994 with total page 18 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 Materials for Smart Systems Volume 360 written by Easo P. George and published by . This book was released on 1995-03-28 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Barium Strontium Titanate and Non ferroelectric Oxide Ceramic Composites for Use in Phased Array Antennas written by and published by . This book was released on 1994 with total page 24 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 1995 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thin Films of Novel Ferroelectric Composites written by and published by . This book was released on 1995 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites of BSTO combined with other non electrically active oxides have demonstrated adjustable electronic properties which can be tailored for use in various electronic devices. These novel composites of barium strontium titanate (BSTO) and Oxide III compounds have already exhibited promising results in their ceramic form. The additive oxides modify the dielectric constant, tunability (change in the dielectric constant with applied voltage), and dielectric loss of the material. One application has been for use in phased array antennas and insertion has been accomplished into several working antenna systems. To further accommodate the frequencies required by these phased array antennas, thin films of the composites have been fabricated. Preliminary studies have indicated that thin films of such composites exhibit similar behavior as their bulk ceramic counterparts. The purpose of this study is to investigate the properties of the BSTO/Oxide III based compounds in thin film form. (MM).

Download or read book Twentieth Army Science Conference Award Winning Papers written by Michael S Shur and published by World Scientific. This book was released on 1997-06-19 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important volume contains the 21 prize-winning papers presented at the Twentieth United States Army Science Conference under the sponsorship of the Assistant Secretary of the Army for Research, Development and Acquisition. The theme of the conference was “Science and Technology for Force XXI — the Force of the Twenty-First Century”. Original scientific and technical papers — written by U.S. Army civilian and military scientists and engineers — addressed the role of science and technology in providing a competitive edge for Force XXI. The papers in this book are in the following key technical areas: advanced materials and manufacturing including structures and energetics; microelectronics and photonics; sensors and information processing including communications; high-performance computing and simulation including modeling, displays, artificial intelligence, and virtual reality; advanced propulsion technologies including mobility and lethality; power generation, storage and conditioning including directed energy; biological, chemical and nuclear defense; life, medical and behavioral sciences including individual sustainability and soldier-system interface; environmental sciences and geosciences including atmospheric, space and environmental protection; engineering sciences including robotics, mechanics, fluid dynamics and survivability.

Download or read book Electrical Characteristics of Barium Strontium Titanate oxide Composite Films written by and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smart Structures and Materials 1994 written by V. K. Varadan and published by . This book was released on 1994 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smart Structures and Materials written by and published by . This book was released on 1994 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Processing and Characterization of Functionally Gradient Ceramic Materials written by and published by . This book was released on 1994 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Epoxy Composites written by Jyotishkumar Parameswaranpillai and published by John Wiley & Sons. This book was released on 2021-06-01 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover a one-stop resource for in-depth knowledge on epoxy composites from leading voices in the field Used in a wide variety of materials engineering applications, epoxy composites are highly relevant to the work of engineers and scientists in many fields. Recent developments have allowed for significant advancements in their preparation, processing and characterization that are highly relevant to the aerospace and automobile industry, among others. In Epoxy Composites: Fabrication, Characterization and Applications, a distinguished team of authors and editors deliver a comprehensive and straightforward summary of the most recent developments in the area of epoxy composites. The book emphasizes their preparation, characterization and applications, providing a complete understanding of the correlation of rheology, cure reaction, morphology, and thermo-mechanical properties with filler dispersion. Readers will learn about a variety of topics on the cutting-edge of epoxy composite fabrication and characterization, including smart epoxy composites, theoretical modeling, recycling and environmental issues, safety issues, and future prospects for these highly practical materials. Readers will also benefit from the inclusion of: A thorough introduction to epoxy composites, their synthesis and manufacturing, and micro- and nano-scale structure formation in epoxy and clay nanocomposites An exploration of long fiber reinforced epoxy composites and eco-friendly epoxy-based composites Practical discussions of the processing of epoxy composites based on carbon nanomaterials and the thermal stability and flame retardancy of epoxy composites An analysis of the spectroscopy and X-ray scattering studies of epoxy composites Perfect for materials scientists, polymer chemists, and mechanical engineers, Epoxy Composites: Fabrication, Characterization and Applications will also earn a place in the libraries of engineering scientists working in industry and process engineers seeking a comprehensive and exhaustive resource on epoxy composites.

Download or read book Investigation of the Effect of Various Oxide and Fluoride Additives on the Microstructure Electronic Properties and Phase Shifting Ability of Ba 1 x Sr x TiO3 written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ceramic phase shifting device (used in phased array antenna systems) has been demonstrated using Ba(1-x)Sr(x)TiO3 (BSTO) ceramics. As a part of an effort to optimize the electronic device performance in the phase shifter, various dopants have been incorporated into BSTO. The effects of these additives on the Curie temperature, dielectric properties, tunability, hysteresis, and grain size have been investigated. The homogeneity of the doped materials has been verified using Curie-Weiss analysis. To further improve the electrical performance, some higher levels of doping have been attempted. A few of the latest results for these ceramic-ceramic composites will be presented. Phased array antennas, Ferroelectrics, Electro-ceramics, Barium strontium titanate.

Download or read book Polar Oxides written by Rainer Waser and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, more than 20 experts from leading research institutes around the world present the entire scope of this rapidly developing field. In so doing, they cover a wide range of topics, including the characterization and investigation of structural, dielectric and piezoelectric properties of ceramic materials, a well as phase transitions, electrical and optical properties and microscopic investigations. Another feature is a complete profile of the properties of polar oxides -- from their proof to their latest applications. Throughout, the authors review, discuss and assess the material properties with regard to new and advanced characterization and imaging techniques. For physicists, physicochemists, semiconductor and solid state physicists, materials scientists, and students of chemistry and physics.

Download or read book Frontiers of Ferroelectricity written by Sidney B. Lang and published by Springer Science & Business Media. This book was released on 2007-12-31 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents theory, fundamentals and applications of ferroelectricy. 24 chapters gather reviews and research reports covering the spectrum of ferroelectricity. It describes the current levels of understanding of various aspects of ferroelectricity as presented by authorities in the field. Topics include relaxors, piezoelectrics, microscale and nanoscale studies, polymers and composites, unusual properties, and techniques and devices. The book is intended for physicists, engineers and materials scientists working with ferroelectric materials.