Growth of Lead Magnesium Niobate-lead Titanate Single Crystals by Seeded Polycrystal Conversion PDF Download
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Author: Adam Matthew Scotch
Publisher:
ISBN:
Category : Crystal growth
Languages : en
Pages : 248
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Book Description
Relaxor-based ferroelectric single crystals of Pb(Mg1/3Nb 2/3)O3-PbTiO3 [PMN-PT] have been produced via the Seeded Polycrystal Conversion [SPC] technique. Polycrystalline precursors of PMN-PT are converted to single crystals by inducing the boundary of a seed crystal to migrate through a polycrystalline matrix. The quality of PMN-PT single crystals grown by SPC is directly influenced by the microstructure of the polycrystalline precursor. The goal of this work was to examine the factors that controlled the final microstructure of the matrix and grown single crystals and to characterize their effects on properties.
Author: Adam Matthew Scotch
Publisher:
ISBN:
Category : Crystal growth
Languages : en
Pages : 248
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Book Description
Relaxor-based ferroelectric single crystals of Pb(Mg1/3Nb 2/3)O3-PbTiO3 [PMN-PT] have been produced via the Seeded Polycrystal Conversion [SPC] technique. Polycrystalline precursors of PMN-PT are converted to single crystals by inducing the boundary of a seed crystal to migrate through a polycrystalline matrix. The quality of PMN-PT single crystals grown by SPC is directly influenced by the microstructure of the polycrystalline precursor. The goal of this work was to examine the factors that controlled the final microstructure of the matrix and grown single crystals and to characterize their effects on properties.
Author: Edward Peter Gorzkowski
Publisher:
ISBN:
Category : Crystal growth
Languages : en
Pages : 310
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Book Description
The influence of excess PbO on {001} single crystal growth was studied in the range of 0--10 vol% PbO. It was found that up to 1.5 vol% PbO, the amount of single crystal and grain growth increased with increasing PbO additions. At higher PbO contents, however, the growth becomes independent of liquid fraction for all annealing times. In addition since the matrix grains were faceted and the growth best fit parabolic kinetics, interface reaction control was deemed the most likely growth mechanism.
Author: Faris Ahmed Kochary
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
During this program the following milestones were achieved: (1) Developed a method for synthesizing near pyrochlore-free PMNT starting material for crystal growth using the Columbite process and Pb3O4. Pyrochlore-free starting material prevents the crystals from sticking to the walls of the Pt crucibles and thereby prevents some forms of cracking. An another important development was the use of commercial magnesium niobate that reduced the number of processing steps and time by 50%. (2) Measured the liquidus curve in the PMN-PT phase diagram system for the first time. (3) Grew the first large PNM and PMN 10PT single crystals from nonfluxed melts by the Bridgman method during the first year and had their properties measured. These crystals grew along the 111 direction, their fast growth axis and their properties were consistent with literature values, (4) Grew large, transparent one inch diameter boules of PMN-3PT and PMN-32PT crystals using seed crystals for evaluation of compositional and structural uniformity, crystalline defects, etc. Uniform axial and radial composition was found in one cm diameter boules but axial Ti concentration variations were over 10% in one inch diameter crystals. Samples have been submitted for property measurements and evaluation to NUWC, Tetrad, Washington State University, Penn State University, Hewlett Packard, Wilcoxon, etc. It was found that the properties of the tetragonal PMNT phase (greater than 35% Ti) were not as good as those for rhombohedral crystals.
Author: Madhana Sunder
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Book Description
Author: Andrei L. Kholkin
Publisher: Elsevier
ISBN: 0128216484
Category : Technology & Engineering
Languages : en
Pages : 452
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Book Description
The Electrocaloric Effect: Materials and Applications reviews the fundamentals of the electrocaloric effect, the most relevant electrocaloric materials, and electrocaloric measurements and device applications. The book introduces the electrocaloric effect, along with modeling and simulations of this effect. Then, it addresses the latest advances in synthesis, characterization and optimization of the most relevant electrocaloric materials, including ferroelectric materials, liquid materials, lead-free materials, polymers and composites. Finally, there is a review of the latest techniques in measurement and applications in refrigeration and cooling and a discussion of the advantages, challenges and perspectives of the future of electrocaloric refrigeration. - Provides a comprehensive introduction to the electrocaloric effect including experimental techniques to measure, model, and simulate the effect - Reviews the most relevant electrocaloric materials such as composites, polymers, metal oxides, ferroelectric materials, and more - Touches on the design and application of electrocaloric materials for devices with potential cooling and refrigeration applications
Author: Faris Ahmed Kochary
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Book Description
Author: Alp Sehirlioglu
Publisher:
ISBN:
Category :
Languages : en
Pages : 420
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Book Description
Author: Roy W. Rice
Publisher: CRC Press
ISBN: 9780203911020
Category : Technology & Engineering
Languages : en
Pages : 376
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Book Description
Bridging the gap between textbook science and real-world engineering and operational applications, this reference presents comprehensive and easy-to-follow summaries and evaluations of fabrication techniques for ceramic and ceramic composite specimens and components. The author addresses both conventional and alternative powder-based fabrication, c
Author: Ruyan Guo
Publisher: John Wiley & Sons
ISBN: 1118405749
Category : Technology & Engineering
Languages : en
Pages : 584
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Book Description
Proceedings of the Symposium on Dielectric Materials and Multilayer Electronic Devices and the Symposium on Morphotropic Phase Boundary Phenomena and Perovskite Materials, held April 28 - May 1, 2002, in St. Louis, Missouri, during the 104th Annual Meeting of the American Ceramic Society, and the Focused Session on High Strain Piezoelectrics, held April 22-25, 2001, in Indianapolis, Indiana, during the 103rd Annual Meeting of the American Ceramic Society.
