The Effect of Liquid Phase Chemistry on Growth of Lead Magnesium Niobate-lead Titanate Single Crystals by Seeded Polycrystal Conversion PDF Download
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Author: Edward Peter Gorzkowski
Publisher:
ISBN:
Category : Crystal growth
Languages : en
Pages : 310
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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: 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: 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:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 754
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Author: Faris Ahmed Kochary
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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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: Alp Sehirlioglu
Publisher:
ISBN:
Category :
Languages : en
Pages : 420
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Author: Madhana Sunder
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Faris Ahmed Kochary
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Author: Jingping Gao
Publisher:
ISBN:
Category : Ferroelectricity
Languages : en
Pages : 0
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Author: David Zekria
Publisher:
ISBN:
Category : Lead compounds
Languages : en
Pages : 392
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