Active optoceramics with cubic crystal structure, method of production of the optoceramics, and uses thereof

A technology of electro-optic ceramics and cubic structure, which is applied in chemical instruments and methods, luminescent materials, radiation measurement, etc., and can solve problems such as opacity, difficulty in preparation, and low effective atomic number

Inactive Publication Date: 2010-08-25
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solutions known to date are either opaque, or only translucent, and / or have too low a density and / or effective atomic number, or are difficult to fabricate

Method used

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  • Active optoceramics with cubic crystal structure, method of production of the optoceramics, and uses thereof

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0091] working example

[0092] 1. By uniaxial pressing (with reactive sintering) from Ce:Gd 2 f 2 o 7 and Ce:Lu 2 f 2 o 7 The embodiment that prepares transparent ceramic

[0093] In proportion to target composition, weighed from CeO 2 、Gd 2 o 3 or Lu 2 o 3 and HfO 2 A powder having primary particles with a diameter 2 The batch was ball mixed for 12 hours.

[0094] The milled suspension was dried on a hot plate.

[0095] The powder was subsequently uniaxially pressed into sheets. The pressure condition is about 20 MPa, and the pressing time is several seconds. The preformed compact (Pressling) is repressed with cooling isostatic pressure, wherein the pressing force is about 180 MPa. The pressure transmission medium is water.

[0096] The binder is then burned off in a first heating step. The tempering time was 2.5 hours and the temperature was 700°C. The fired green body is then fired in a vacuum sintering furnace (negative pressure: 10 -5 mbar) for sinteri...

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Abstract

The present invention refers to active optoceramics with a cubic crystal structure, a method of producing the same and its use, particularly to the optoceramics having high transmissions, high densities and high effective atomic numbers. The optoceramics are doped with activator elements. The materials are suitable to absorb high-energy radiation and transform it to photons of visible light. Thus the materials suit as scintillator media for e.g. medical imaging (CT, PET, SPECT or combined PET / CT systems), security (X-ray detectors) or can serve in object tracing or investigation (exploration, prospecting for resources). The crystallite grains, forming the materials of the present invention, have cubic crystal structures (point and space groups as well as atom layers isotypic to those of the pyrochlore or fluorite minerals) or are clearly derivable from both mentioned minerals in terms of crystal structure. and have the following formula: A2+xByDzE7, wherein 0<=x<=1.1, 0<=y<=3, 0<=z<=1.6, and 3x+4y+5z=8, and wherein A is at least one trivalent rare earth cation, B is at least one tetravalent cation, D is at least one pentavalent cation, and E is at least one divalent anion.

Description

technical field [0001] The subject of the invention is an optoceramic with high transmission, high density and high effective atomic number, which is doped with activator elements. The activator elements are preferably selected from rare earth ions; titanium ions or transition metal ions are also possible. The material is suitable for absorbing high-energy radiation (preferably X-rays and gamma rays, but also particle radiation) and converting them into photons of visible light. [0002] The material is thus suitable, for example, as a scintillation medium (Szintillationsmedien) for medical imaging (CT, PET, SPECT or combined PET / CT systems), security (X-ray detection devices) or can be used for object tracking and surveying (Erkundung) (Exploration, Resource Exploration (Rohstofferschlieβung)). The grains formed from the material according to the invention have a cubic crystal structure (point and space groups and atomic layers are isotypous to those of the pyrochlore or fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/495G01T1/202
CPCG21K4/00G21K2004/06C04B2235/6585C09K11/7787C04B2235/3229C04B2235/9653C04B2235/663C04B35/486C09K11/7769C04B35/495C04B2235/6562C04B2235/604C04B35/645C04B2235/6581C04B35/6455C04B2235/762C04B2235/661C04B2235/3224C04B35/49
Inventor U·普彻特Y·门克
Owner SCHOTT AG
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