Pure or mixed monocrystalline boules of lanthanum orthogallate

Details Pure or mixed monocrystalline boules of lanthanum orthogallate Pure or mixed monocrystalline boules of lanthanum orthogallate

1990-01-25

1990-11-13

Roy, Upendra

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

1566171, 252521, 420555, C04B 3546, B01J 1718

Patent

active

049700600

ABSTRACT:
Monocrystalline lanthanum orthogallate compositions grown along a predetermined crystallographic direction in the form of a single crystal of a size greater than 1 cm in diameter/width and at least 10 cm in length are described. Such compositions include mixed crystal monocrystalline lanthanum orthogallates wherein a portion of the lanthanum is replaced with a rare earth element of smaller ionic radius than lanthanum and/or a portion of the gallium is replaced with Al, Sc or In. The foregoing monocrystalline compositions are particularly suited as superconductor substrates.

REFERENCES:
E. J. Baran--Infrared Spectrum of LaGaO.sub.3 ; 1975; pp. 3572-3575, Naturforsch; National Unversity of LaPlata, Argentina, pp. 136-137.
J. Yang et al.--On the Luminescence of Perovskite Type Rare Earth Gallates; 1985; New Front. Rare Earth Sci., vol. 2, pp. 860-863.
G. Sallavuard et al.--Lanthanide Monogallates; Mar. 1969; C. R. Academy of Sciences, Paris; pp. 1050-1053.
M. Mizuno et al.--Phase Diagram of the System Gallium Trioxide--Lanthanum Oxide at High Temps.; Gov't. Industrial Research Institute, 1985; pp. 295-300.
D. Lefebvre et al.--Substituted Lanthanum Hexagallates a . . . Substrates; Materials Research Bulletin, vol. 22; pp. 1039-1045, (1987).
G. F. Ruse et al.--Growth of Neodymium Gallium Oxide Crystals; Journal of Crystal Growth, 29, (1975), pp. 305-308.

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