Method for preparing yttrium 66 boride crystal for soft x-ray mo

Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Having moving solid-liquid-solid region

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117944, C30B 1304

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active

053363620

ABSTRACT:
It is an object of the present invention to obtain a high quality YB66 crystal by lowering the temperature of the molten zone and growing a crystal by deposition growth under an incongruent condition. A method for preparing a yttrium 66 boride crystal by the floating zone method by use of a YB66 polycrystalline rod. A YB66 crystal having a composition with an atomic ratio B/Y within a range of from 50 to 75, is grown under such conditions that the melt has a composition (an atomic ratio B/Y) different from the raw YB66 polycrystalline rod and the growing YB66 crystal, and that an equilibrium is maintained at the growth interface. When the atomic ratio B/Y of the starting material is within the range of from 50 to 62 and the atomic ratio B/Y of the melt is within the range of from 40 to 62, it is possible to attain the atomic ratio B/Y of the growing crystal within the range of from 50 to 62. When the atomic ratio B/Y of the starting material is within the range of from 62 to 75 and the atomic ratio B/Y of the melt is within the range of from 62 to 93, it is possible to attain the atomic ratio B/Y of the growing crystal within the range of from 62 to 75.

REFERENCES:
"Preparation of Single Crystals of YB.sub.66 "; Tanaka et al., Journal of Crystal Growth 73 (1985) pp. 31-36.
"Growth of High Quality Single Crystals of YB.sub.66 "; Tanaka et al.; Journal of Crystal Growth 99 (1990); pp. 994-997.

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