Mixed oxide materials

Patent metadata

Field	Value
Publication number	US-9315726-B2
Application number	US-201414773413-A
Country	US
Kind code	B2
Filing date	Mar 21, 2014
Priority date	Mar 26, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

The present invention relates to mixed oxide materials, methods for their preparation, detectors for ionizing radiation and CT scanners. In particular, a mixed oxide material is proposed having the formula (Y w Tb x ) 3 Al 5-y Ga y O 12 :Ce z , wherein 0.01≦w≦0.99, 0.01≦x≦0.99, 0≦y≦3.5 and 0.001≦z≦0.10 and wherein w+x+3*z=1, whereby the mixed oxide material is doped with at least 10 ppm V.

First claim

The invention claimed is:

1. A mixed oxide material having the formula (Y w Tb x ) 3 Al 5-y Ga y O 12 :Ce z , wherein 0.01≦w≦0.99, 0.01≦x≦0.99, 0≦y≦3.5 and 0.001≦z≦0.10 and wherein w+x+3*z=1; whereby the mixed oxide material is doped with at least 10 ppm V.

2. The mixed oxide material according to claim 1 , whereby the material is doped with 10 to 250 ppm V.

3. The mixed oxide material according to claim 1 , whereby 0.1≦w≦0.9.

4. The mixed oxide material according to claim 1 , whereby 0.1≦x≦0.9.

5. The mixed oxide material according to claim 1 , whereby 1≦y≦3.5.

6. The mixed oxide material according to claim 1 , whereby 0.005≦z≦0.05.

7. The mixed oxide material according to claim 1 , whereby the material is a single-crystalline or polycrystalline material.

8. A method for producing a mixed oxide material according to claim 1 , comprising the following steps;
a) providing Y 2 O 3 , CeO 2 , Tb 4 O 7 , Al 2 O 3 and Ga 2 O 3 in proportions suitable to obtain the desired mixed oxide,
b) impregnating one or several of the solids of step a) with a source of V in the desired amount,
c) combining and milling the solids of step a) and step b) in the presence of a suitable dispersant, to obtain a slurry,
d) drying the slurry of step c) to obtain a mixed powder, and
e) sintering the mixed powder of step d) at a temperature of at least 1400° C. for at least 1 h.

9. The method according to claim 8 , whereby in step c) a flux material is added when combining the solids of step a) and step b).

10. A scintillator comprising a mixed oxide material according to claim 1 .

11. A detector for ionizing radiation comprising a mixed oxide material according to claim 1 or a scintillator in combination with at least one photodetector.

12. A CT scanner comprising at least one detector according to claim 11 .

Assignees

• Koninkl Philips Nv

Inventors

• Ronda Cornelis Reinder
• Boerekamp Jacobus Gerardus
• Buettner Daniela
• Van Dongen Anne-Marie Andree
• Wieczorek Herfried Karl
• Spoor Sandra Johanna Maria Paula
• Djohan Silvan
• Keur Wilhelmus Cornelis

Classifications

• C09K11/7774 Primary

  Aluminates · CPC title

• G01T1/2023

  Selection of materials · CPC title

• A61B6/03

  Computed tomography [CT] · CPC title

• A61B6/4208

  characterised by using a particular type of detector · CPC title

• G01T1/2016

  Erasing of stimulable sheets, e.g. with light, heat or the like · CPC title