Author: Vikram JoshiPublisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Process Structure and Property Correlations in Sol-gel Derived Lithium Niobate Thin Films
Author: Vikram JoshiEvolution of Molecular Structure During the Sol-gel Processing of Lithium Niobate and the Development of Microstructure in Alkoxide Derived Thin-layers
Author: Dennis John EichorstPublisher:
ISBN:
Category :
Languages : en
Pages : 440
Book Description
Lithium niobate powders and thin-layers were prepared by sol-gel processing. Lithium niobium ethoxide and lithium niobium methoxyethoxide bimetallic alkoxides were used for both gel and thin-layer formation. Advantages of sol-gel processing were demonstrated by synthesis of LiNb(OCH$sb2$CH$sb3)sb6$crystals having the proper cation ratio for stoichiometric LiNbO$sb3$. The alkoxide deposition method also allowed for the formation of layers of uniform quality at 650$spcirc$C, thereby, avoiding lithium oxide volatility. Lithium and niobium alkoxides reacted immediately to form bimetallic alkoxides. The structure of LiNb(OCH$sb2 $CH$ sb3)sb6$ consisted of niobium ethoxide octahedra linked by lithium. Studies of hydrolysis indicated a possible gelation mechanisms of cross-linking of individual lithium niobium ethoxide "polymers". Raman studies indicated the precursor alkoxide may be maintained during formation of an amorphous oxide, and considerable long range order developed prior to crystallization. Crystallization was followed by x-ray diffraction, infrared and Raman spectroscopies. At approximately 500$spcirc$C, the material crystallized directly into the R3c phase of lithium niobate. Heat-treatment above 650$spcirc$C gave changes associated with lithia volatility. Lithium and niobium methoxyethoxides also reacted to produce a bimetallic alkoxide. However, lithium niobium methoxyethoxide could not be crystallized from the parent alcohol. Raman studies indicated significantly less long-range order in the methoxyethoxide specimens after similar heat-treatments. The difference in long-range order was attributed to the similarity in structure of lithium niobium ethoxide with lithium niobate. During heat-treatment, structural relaxation may provide for long range order and hence crystal nuclei. Lithium niobium methoxyethoxide, on the other hand, may require greater structural rearrangement prior to crystallization. Ceramic microstructures depended on solution formulation in addition to heat-treatment conditions. Generally, rapid heating gave dense layers and a larger grain size, than by heating at 10$spcirc$C/min. Water and ammonium hydroxide additions aided densification at lower heating rates. The results demonstrate the important relationships between solution chemistry, oligomeric structures, and final microstructures.
Structure-property Relationships in Sol-gel-derived Thin Films
Author: Epitaxial Effects in Sol-gel Derived Lithium Niobate Thin Layers
Author: Daniel Scott HagbergPublisher:
ISBN:
Category :
Languages : en
Pages : 180
Book Description
American Doctoral Dissertations
Author: Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 872
Book Description
Sol-gel Processing, Microstructural Development, and Electrical Properties of Ferroelectric Lead Zirconate-titanate Thin Films
Author: Cheng-Chen HsuehSol-Gel Method
Author: Guadalupe Valverde AguilarPublisher: BoD – Books on Demand
ISBN: 1789853338
Category : Technology & Engineering
Languages : en
Pages : 108
Book Description
The sol-gel method is a powerful route of synthesis used worldwide. It produces bulk, nano- and mesostructured sol-gel materials, which can encapsulate metallic and magnetic nanoparticles, non-linear azochromophores, perovskites, organic dyes, biological molecules, etc.. This can have interesting applications for catalysis, photocatalysis; drug delivery for treatment of neurodegenerative diseases such as cancer, Parkinson's and Azheimer's. In this book, valuable contributions related to novel materials synthesized by the sol-gel route are provided. The effect of the sol-gel method to synthesize these materials with potential properties is described, and how the variation of the parameters during the synthesis influences their design and allows to adjust their properties according to the desired application is discussed.
Sol-Gel Technology for Thin Films, Fibers, Preforms, Electronics and Specialty Shapes
Author: Lisa C. KleinPublisher: William Andrew
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 440
Book Description
Annotation Provides background and fundamentals and evaluates present technology. Main topics are thin films in optical, mechanical, and electrical applications; fibers in refractories, composite reinforcement, and thermal insulation; and special applications such as preforms, microballoons, and electronics. Articles are grouped under chemistry and phase transformations; coatings, thin films, and surface treatment; continuous, discontinuous, and woven fibers; monoliths, shapes, and preforms; and special applications. Annotation(c) 2003 Book News, Inc., Portland, OR (booknews.com)
Integrated Ferroelectrics. Volume 4, Number 3. 1994. Proceedings of the International Symposium on Integrated Ferroelectrics (5th) Held in Colorado Springs, Colorado, in April 1993
Author: PRINCETON RESOURCES INC NJ.Publisher:
ISBN:
Category :
Languages : en
Pages : 129
Book Description
Topics presented include: (1) PIMOD processing and properties of a LiNbO3-based MFSFET for nonvolatile memories; (2) Structure-property relations in polycrystalline titanate thin films; (3) Process property correlations in sol-gel derived lithium niobate thin films; (4) Retention and endurance effects of 4K and 64K fram memories; (5) Correlation between the Sawyer-Tower measured charge/area of a thin film PZT ferroelectric and the thickness mode piezoelectric coupling coefficient; (6) Electrical properties of sol-gel derived La-dopedPbTiO3-containing films; (7) Influence of processing conditions on Hillock formation in electron-beam evaporated platinum/titanium films; (8) Trends in the development of ULSI dram capacitors; (9) Optically addressed ferroelectric memory and its applications; (10) Possible interrelations between ferroelectrics and superconductors; (11) Anodic dissolution of metals in methoxyethanol-way to new precursors for sol-gel technology; and (12) Active beam vibration control using PZT actuators.
Lithium Niobate-based Heterostructures
Author: Maxim SumetsPublisher:
ISBN: 9780750317283
Category : Ferroelectric thin films
Languages : en
Pages : 0
Book Description
With the use of ferroelectric materials in memory devices and the need for high speed integrated optics devices, the interest in ferroelectric thin films continues to grow. With their remarkable properties such as energy nonvolatility, fast switching, radiative stability, and unique optoacoustic and optoelectronic properties, Lithium Niobate-Based Heterostructures: Synthesis, properties and electron phenomena, discusses why Lithium Niobate (LiNbO3) is one of the most promising of all ferroelectric materials. Based on years of study, this book presents the systematic characterization of substructure and electronic properties of a heterosystem formed in the deposition process of lithium niobate films onto the surface of silicon wafers.