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Title: Microwave Processing for Advance Electro-Optic Materials

Abstract

This project addressed the technical and scientific goals of developing new methods for the formation of striation-free single crystals of potassium tantalate niobate. This solid-solution system has the potential for serving as a general electro-optic material with a wide range of optical applications. The performance of the material is, however, severely limited by the effects of compositional inhomogeneity that is generally induced during the single crystal growth process due to the nature of the binary phase diagram of the mixed tantalatehiobate system. Single-crystal boules of potassium tantalate niobate (KTa{sub 1-x}Nb{sub x}O{sub 3} or KTN) with varying tantalum-to-niobium ratios (or values of x) were grown under a variety of experimental conditions. The resulting single crystals were characterized in terms of their compositional homogeneity and optical quality. Single crystals were grown using both the most-favorable established set of growth parameters as well as in the presence of programmed oscillatory temperature variations. The purpose of these deliberately induced variations was to introduce controlled compositional variations and associated optical striations in the solid-solution single crystals. The overall objective of the effort was to utilize microwave heating and processing methods to treat the inhomogeneous single crystals for the purpose of eliminating the compositional variations thatmore » lead to striations and the associated varying changes in the refractive index of the material. In order to realize the ultimate goal of the effort, it was necessary to develop methods that would lead to the effective coupling of the microwave field to the KTN single crystals. Achieving the technical and commercial goals of this effort would have made it possible to introduce an important new electro-optic product into the market place, to improve our fundamental understanding of solid-state diffusion processes in general (and of microwave-assisted thermal processes in particular), and finally, to create a new class of industrial applications for microwave heating.« less

Authors:
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
940380
Report Number(s):
ORNL96-0478
TRN: US200824%%267
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DIFFUSION; MARKET; MICROWAVE HEATING; MONOCRYSTALS; NIOBATES; PERFORMANCE; PHASE DIAGRAMS; POTASSIUM; PROCESSING; REFRACTIVE INDEX; STRIATIONS; TANTALATES

Citation Formats

Boatner, L.A. Microwave Processing for Advance Electro-Optic Materials. United States: N. p., 2000. Web. doi:10.2172/940380.
Boatner, L.A. Microwave Processing for Advance Electro-Optic Materials. United States. doi:10.2172/940380.
Boatner, L.A. Thu . "Microwave Processing for Advance Electro-Optic Materials". United States. doi:10.2172/940380. https://www.osti.gov/servlets/purl/940380.
@article{osti_940380,
title = {Microwave Processing for Advance Electro-Optic Materials},
author = {Boatner, L.A.},
abstractNote = {This project addressed the technical and scientific goals of developing new methods for the formation of striation-free single crystals of potassium tantalate niobate. This solid-solution system has the potential for serving as a general electro-optic material with a wide range of optical applications. The performance of the material is, however, severely limited by the effects of compositional inhomogeneity that is generally induced during the single crystal growth process due to the nature of the binary phase diagram of the mixed tantalatehiobate system. Single-crystal boules of potassium tantalate niobate (KTa{sub 1-x}Nb{sub x}O{sub 3} or KTN) with varying tantalum-to-niobium ratios (or values of x) were grown under a variety of experimental conditions. The resulting single crystals were characterized in terms of their compositional homogeneity and optical quality. Single crystals were grown using both the most-favorable established set of growth parameters as well as in the presence of programmed oscillatory temperature variations. The purpose of these deliberately induced variations was to introduce controlled compositional variations and associated optical striations in the solid-solution single crystals. The overall objective of the effort was to utilize microwave heating and processing methods to treat the inhomogeneous single crystals for the purpose of eliminating the compositional variations that lead to striations and the associated varying changes in the refractive index of the material. In order to realize the ultimate goal of the effort, it was necessary to develop methods that would lead to the effective coupling of the microwave field to the KTN single crystals. Achieving the technical and commercial goals of this effort would have made it possible to introduce an important new electro-optic product into the market place, to improve our fundamental understanding of solid-state diffusion processes in general (and of microwave-assisted thermal processes in particular), and finally, to create a new class of industrial applications for microwave heating.},
doi = {10.2172/940380},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}