Process for preparing yttrium oxide and rare earth metal...

Details Process for preparing yttrium oxide and rare earth metal... Process for preparing yttrium oxide and rare earth metal...

Category

H - Electricity

Subcategory

01

Subsubcategory

J

CPC

31/124

IPC codes

H01J 35/00 (2006.01) C09K 11/77 (2006.01) G21K 4/00 (2006.01) H01J 35/02 (2006.01)

Type

Patent

Patent number

CA 1038618

Description

6 PROCESS FOR PREPARING YTTRIUM OXIDE AND RARE EARTH METAL OXIDE PHOSPHORS Abstract of the Disclosure Oxide phosphors which have a host matrix of yttrium or a rare earth metal and are activated by one or more rare earth metal activators are prepared by heating a mixture of salts Or the host and activator metals (preferably this mixture is formed by co-precipitating the salts of the host and acti- vator metals) at an elevated temperature in an oxygen-containig atmosphere to form the oxide phosphor, and then heating the phosphor at an elevated temperature in a non-oxidizing atmos- phere which is free of halogenating agents, chalcogenating agents, or fluxes. The step of heating in a non-oxidizing at- mosphere brings about a substantial increase in the X-ray speed of the phosphor and aslo improves the stability of the phosphor- to light and increases its reflectance in the visible region Or the spectrum. Phosphors prepared by use of this process are useful in the manufacture of X-ray intensifying screens.

Application Number

202818

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