Method for obtaining a solid polycrystalline material

Details Method for obtaining a solid polycrystalline material Method for obtaining a solid polycrystalline material

1989-03-08

1993-01-05

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544186, 546312, 564 63, 564 73, C07D48718, C07D21389, C07C27302

Patent

active

051772051

ABSTRACT:
Method for obtaining an organic polycrystalline material having in particular electro-optical properties, said material obtained and an electro-optical modulator comprising said material.
This method includes a stage (1) for preparing a powder having a size grading of 500 to 800 nm of an organic compound having a delocalized system of electrons .pi. and presenting a non-centrosymmetrical crystalline structure, as well as intramolecular load transfer groupings, a stage (2) for drying the powder under vacuum, a stage (3) for pre-pressing the powder under vacuum, and a hot stage (5) for the uniaxial compression of the dried powder under vacuum.
This method enables polycrystalline materials to be obtained, said materials comprising elongated monocrystalline grains orientated according to a given direction.

REFERENCES:
patent: 4044082 (1977-08-01), Rosette
Article on Organic Nonlinear Optical Compound vol. 12 No. 156 (P 701) May 13, 1988, Tsunekawa.
Article on Optics Communications vol. 29 No. 2 May 1979, Cassidy et al.
Soviet Journal of Quantum Electronics on Determination of the Frequency Interval of Phase Matched Nonlinear Conversion in Powder of Various Molecular Crystals dated Feb. 16, 1986, Kochikyar et al. pp. 272-274.

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