Intrinsic complex halide elpasolite scintillators and methods of making and using same

Patent metadata

Field	Value
Publication number	US-9561969-B2
Application number	US-201514688879-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Apr 18, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

The present disclosure is directed to a group of newly discovered intrinsic scintillation compounds. As intrinsic scintillators, these compounds do not require an external activator as a dopant. The new scintillators may include members of two elpasolite families with the general exemplary formulas of A 2 BMX (6-y) X′ y and A 3 MX (6-y) X′ y , (0<y<6). Component A may include at least one element selected from the group consisting alkali elements and thallium (Li, Na, K, Rb, Cs and Tl); Component B may include at least one element, different from the at least one element of component A, selected from the group consisting alkali elements (Li, Na, K, Rb, and Cs); Component M may include at least one element selected from the group consisting tri-valence elements (La, Gd, Lu, Bi, Y); Component X may include at least one element selected from the group consisting halide elements (F, Cl, Br and I); Component X′ may include at least one element, different from the at least one element of component X, selected from the group consisting halide elements (F, Cl, Br and I). The value of y may be in a range between 0 and 6 non-inclusively (i.e. 0<y<6, or y={1, 2, 3, 4, 5}).

First claim

What is claimed is:

1. A scintillator consisting essentially of an undoped chemical compound comprising atoms from two different halide elements.

2. The scintillator of claim 1 , wherein the chemical compound has a chemical formula of
A 2 BMX (6-y) X′ y

wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
B is different from A and is one of Li, Na, K, Rb, and Cs,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Cl, Br, I, and
X′ is different from X and is one of F, Cl, Br, and I.

3. The scintillator of claim 1 , wherein the chemical compound has a chemical formula of
A 3 MX (6-y) X′ y
wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Br, I, and
X′ is different from X and is one of F, Br, and I.

4. The scintillator of claim 1 , wherein the two different halide elements are F, Cl, Br, or I.

5. The scintillator of claim 1 , wherein the chemical compound further comprises atoms from a trivalence element.

6. The scintillator of claim 1 , wherein the chemical compound further comprises atoms from the group consisting of alkali elements and thallium.

7. A method of using an undoped chemical compound comprising atoms from two different halide elements as a scintillator.

8. The method of claim 7 , wherein the chemical compound has a chemical formula of
A 2 BMX (6-y) X′ y

wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
B is different from A and is one of Li, Na, K, Rb, and Cs,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Cl, Br, I, and
X′ is different from X and is one of F, Cl, Br, and I.

9. The method of claim 7 , wherein the chemical compound has a chemical formula of
A 3 MX (6-y) X′ y

wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Br, I, and
X′ is different from X and is one of F, Br, and I.

10. The method of claim 7 , wherein the two different halide elements are F, Cl, Br, or I.

11. The method of claim 7 , wherein the chemical compound further comprises atoms from a trivalence element.

12. The method of claim 7 , wherein the chemical compound further comprises atoms from the group consisting of alkali elements and thallium.

13. A method of preparing an undoped scintillator compound comprising atoms from two different halide elements, comprising the steps of:
mixing anhydrous starting materials;
loading the mixed starting materials into a quartz ampoule;
drying the mixed starting materials in the quartz ampoule under vacuum; and
melting the starting materials and synthesizing the scintillator compound using a single zone furnace,
wherein the orientation of the quartz ampoule is inverted a plurality of times.

14. The method of claim 13 , wherein the scintillator compound has a chemical formula of
A 2 BMX (6-y) X′ y

wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
B is different from A and is one of Li, Na, K, Rb, and Cs,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Cl, Br, I, and
X′ is different from X and is one of F, Cl, Br, and I.

15. The method of claim 13 , wherein the scintillator compound has a chemical formula of
A 3 MX (6-y) X′ y

wherein 0<y<6,
A is one of Li, Na, K, Rb, Cs, and Tl,
M is one of La, Gd, Lu, Bi, Y,
X is one of F, Br, I, and
X′ is different from X and is one of F, Br, and I.

Assignees

• Univ Tennessee Res Found

Inventors

• Wei Hua
• Stand Luis
• Zhuravleva Mariya
• Melcher Charles

Classifications

• C30B29/12 Primary

  Halides · CPC title

• C30B11/00

  Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method (C30B13/00, C30B15/00, C30B17/00, C30B19/00 take precedence; under a protective fluid C30B27/00) · CPC title

• C01D17/003 Primary

  Compounds of alkali metals · CPC title

• C09K11/7773

  with alkali or alkaline earth metal · CPC title

• C09K11/7705

  with alkali or alkaline earth metals · CPC title