Conversion of doped polycrystalline material to single crystal m

Compositions: ceramic – Ceramic compositions – Synthetic precious stones

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501153, 313636, C04B 3515

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active

056839499

ABSTRACT:
A solid state method of converting a polycrystalline ceramic body to a single crystal body includes the steps of doping the polycrystalline ceramic material with a conversion-enhancing dopant and then heating the polycrystalline body at a selected temperature for a selected time sufficient to convert the polycrystalline body to a single crystal. The selected temperature is less than the melting temperature of the polycrystalline material and greater than about one-half the melting temperature of the material. In the conversion of polycrystalline alumina to single crystal alumina (sapphire), examples of conversion-enhancing dopants include cations having a +3 valence, such as chromium, gallium, and titanium. The polycrystalline body further can be inhomogeneously doped to form a first portion of the polycrystalline body that is doped to the selected level of the conversion-enhancing dopant and a second portion that is not doped such that heating the doped polycrystalline body causes conversion of first portion to a single crystal structure and the second portion retains a polycrystalline structure.

REFERENCES:
patent: 988230 (1911-03-01), Verneuil
patent: 3026210 (1962-03-01), Coble
patent: 3381047 (1968-04-01), Holtzberg et al.
patent: 3564328 (1971-02-01), Bagley et al.
patent: 3846082 (1974-11-01), Labeelle et al.
patent: 3943324 (1976-03-01), Haggerty
patent: 3998687 (1976-12-01), Meiling et al.
patent: 4046618 (1977-09-01), Chaudhari et al.
patent: 4150317 (1979-04-01), Laska et al.
patent: 4285732 (1981-08-01), Charles et al.
patent: 4444615 (1984-04-01), Matsuzawa et al.
patent: 4519870 (1985-05-01), Matsuzawa et al.
patent: 4900393 (1990-02-01), Kugimiya et al.
patent: 4980236 (1990-12-01), Oomen et al.
patent: 5129029 (1992-07-01), Uemiya et al.

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