Process for producing lithium niobate single crystal

Details Process for producing lithium niobate single crystal Process for producing lithium niobate single crystal

1994-10-05

1996-01-09

Breneman, R. Bruce

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from solid or gel state

117 3, 117937, 423592, C30B 1502

Patent

active

054820014

ABSTRACT:
A process for producing a lithium niobate single crystal which comprises restricting the variation of the Curie point due to the effect of impurities within a specific range in the accurate evaluation of the composition of the lithium niobate single crystal by the use of the Curie point. To produce a lithium niobate single crystal by using, singly or in combination, lithium carbonate having a purity of 99.99% or higher and simultaneously satisfying the condition that the contents therein of elements Na, K, Mg, and A1 are 5.0 ppm or less, 2.0 ppm or less, 0.5 ppm or less, and 0.9 ppm or less, respectively, and niobium pentoxide having a purity of 99.99% or higher and simultaneously satisfying the condition that the contents therein of elements Na, K, Mg, Al, and Cl are 3.0 ppm or less, 1.0 ppm or less, 0.5 ppm or less, 0.9 ppm or less, and 3.0 ppm or less, respectively, according to an ordinary method.

REFERENCES:
patent: 4234557 (1980-11-01), Arendt et al.
patent: 4851205 (1989-07-01), Mitomo
"Congruent Composition & Li-Rich Phase Boundary of LiNbO.sub.3 "; Bryan, et al; J of American Chem Soc.; 68(9) pp. 493-496 (1985).
O'Bryan, et al., "Congruent Composition and Li-Rich Phase Boundary of LiNbO.sub.3 ", J. Am. Ceram. Soc., vol. 68, No. 9, pp. 493-496.

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