Single crystal of compound, laser rod, laser oscillator, scintillator, CT scanner, color display and process for preparing the same

U.S. Patent Number: 5386797

Abstract: A single crystal of a compound comprises which easily decomposes at a temperature around the melting point and evaporates at least a part of the compound having a volume of 5 cc or more and a composition deviation of respective elements from the stoichiometric composition of the compound being within the range of .+-.5% in terms of weight ratio. Also, a process for preparing a single crystal of a compound comprises the steps of deaerating and sealing powder of a starting material for the single crystal in a sealable capsule, sintering the powder by subjecting to heat treatment (HIP treatment) at a temperature 1/2 or higher of the melting point in terms of the absolute temperature while applying high pressure to a sealed material of the powder, deaerating and sealing the sintered body in a sealable capsule made of a similar high melting point substance and having an inner shape corresponding to the shape of the sintered body, and preparing a single crystal by subjecting a sealed material of the sintered body to heat treatment at a temperature of the melting point of the starting material of the single crystal under pressure. As the single crystal of a compound, high quality single crystals with a large size such as RE.sub.2 O.sub.2 S or REVO.sub.4 (RE is a rare earth element) can be obtained.

Inventors: Yokota; Kazuto (Yokohama, JP)

Assignee: Kabushiki Kaisha Toshiba (Kanagawa, JP)

Application Number: 08/037,109

Issued: 1995-02-07

Expired: 2007-02-07

Classes: 117/41 ; 117/49; 117/50; 117/944

Field of search: 136/616.1,DIG.63,72,621,624 117/944,41,49,50

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