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Electroconductive 12cao.7al2o3, 12sro.7al2o3 or mixture thereof and method for preparation thereof achieved

Foreign code F110003901
File No. E06014WO
Posted date Jul 6, 2011
Country EPO
Application number 04710529
Gazette No. 1650164
Gazette No. 1650164
Date of filing Feb 12, 2004
Gazette Date Apr 26, 2006
Gazette Date Dec 30, 2015
International application number JP2004001507
International publication number WO2005000741
Date of international filing Feb 12, 2004
Date of international publication Jan 6, 2005
Priority data
  • 2004JP001507 (Feb 12, 2004) WO
  • P2003-183605 (Jun 26, 2003) JP
Title Electroconductive 12cao.7al2o3, 12sro.7al2o3 or mixture thereof and method for preparation thereof achieved
Abstract In a solid solution system of Al 2 O 3 and CAO or SrO, it has been difficult to obtain a material having a high electrical conductivity (>10 -4 S·cm - ) at room temperature.
A compound is provided in which electrons at a high concentration are introduced into a 12CaO·7Al 2 O 3 compound, a 12SrO·7Al 2 O 3 compound, or a mixed crystal compound containing 12CaO·7Al 2 O 3 and 12SrO·7Al 2 O 3 .
The compound formed by substituting all the free oxygen ions with electrons is regarded as an electride compound in which [Ca 24 Al 28 O 64 ] 4+ (4e - ) or [Sr 24 Al 28 O 64 ] 4+ (4e - ) serves as a cation and electrons serve as anions.
When a single crystal or a hydrostatic pressure press molded material of a fine powder thereof is held at approximately 700°C in an alkaline metal vapor or an alkaline earth metal vapor, melt of a hydrostatic pressure press molded material of a powder is held at approximately 1,600°C in a carbon crucible, followed by slow cooling for solidification, or a thin film of the compound held at approximately 600°C is implanted with rare gas ions, a great number of the free oxygen ions can be substituted with electrons.
Scope of claims [claim1]
1. A 12CaO.7Al 2O 3 compound comprising: electrons substituting free oxygen ions at a concentration of 1X10 **18 to less than 1.1X10 **21/cm **3, the free oxygen ions contained in cages, at a substitution ratio of the electrons to the free oxygen ions of 2 to 1, the concentration of the electrons being 2X10 **18 to less than 2.2X10 **21/cm **3 in the cages, wherein the electrical conductivity at room temperature is in the range of 10 **-4 S/cm to less than 10 **3 S/cm.
[claim2]
2. A 12SrO.7Al 2O 3 compound comprising: electrons substituting free oxygen ions at a concentration of 1X10 **18 to less than 1.1X10 **21/cm **3, the free oxygen ions contained in cages, at a substitution ratio of the electrons to the free oxygen ions of 2 to 1, the concentration of the electrons being 2X10 **18 to less than 2.2X10 **21/cm **3 in the cages, wherein the electrical conductivity at room temperature is in the range of 10 **-4 S/cm to less than 10 **3 S/cm.
[claim3]
3. A mixed crystal compound containing 12CaO.7Al 2O 3 and 12SrO.7Al 2O 3, comprising: electrons substituting free oxygen ions at a concentration of 1X10 **18 to less than 1.1X10 **21/cm **3, the free oxygen ions contained in cages , at a substitution ratio of the electrons to the free oxygen ions of 2 to 1, the concentration of the electrons being 2X10 **18 to less than 2.2X10 **21/cm **3 in the cages, wherein the electrical conductivity at room temperature is in the range of 10 **-4 S/cm to less than 10 **3 S/cm.
[claim4]
4. A method for manufacturing the compound according to one of Claims 1 to 3, comprising the step of: holding a single crystal 12CaO.7Al 2O 3 compound or a hydrostatic pressure press molded material of a fine powder thereof, a single crystal 12SrO.7Al 2O 3 compound or a hydrostatic pressure press molded material of a fine powder thereof, or a single crystal of a mixed crystal compound containing a 12CaO.7Al 2O 3 compound and a 12SrO.7Al 2O 3 compound or a hydrostatic pressure press molded material of a fine powder thereof at 600 to 800 deg.C for 4 to less than 240 hours in an alkaline metal vapor or an alkaline earth metal vapor, whereby electrons are substituted for the free oxygen ions.
[claim5]
5. The method for manufacturing the compound, according to Claim 4, wherein sodium or lithium is used as the alkaline metal, and magnesium or calcium is used as the alkaline earth metal.
[claim6]
6. A method for manufacturing the compound according to one of Claims 1 to 3, comprising: melting one fine powder of the 12CaO.7Al 2O 3 compound, the 12SrO.7Al 2O 3 compound, and the mixed crystal compound containing a 12CaO.7Al 2O 3 compound and a 12SrO.7Al 2O 3 compound, followed by cooling and solidification, whereby electrons are substituted for the free oxygen ions.
[claim7]
7. The method for manufacturing the compound, according to Claim 6, wherein a melt of one fine powder of the 12CaO.7Al 2O 3 compound, the 12SrO.7Al 2O 3, and the mixed crystal compound containing a 12CaO.7Al 2O 3 compound and a 12SrO.7Al 2O 3 compound is held at more than 1,550 deg.C to less than 1,650 deg.C for more than 1 minute to less than 2 hours in a reducing atmosphere, followed by slow cooling to room temperature.
[claim8]
8. The method for manufacturing the compound, according to Claim 7, wherein the reducing atmosphere according to Claim 7 is an atmosphere in a carbon crucible capped by a lid.
[claim9]
9. A method for manufacturing the compound according to one of Claims 1 to 3, comprising the steps of: holding one thin film made of the 12CaO.7Al 2O 3 compound, the 12SrO.7Al 2O 3 compound, or the mixed crystal compound containing a 12CaO.7Al 2O 3 compound and a 12SrO.7 Al 2O 3 compound at 500 to 1,400 deg.C, and implanting rare gas ions (Ar, Kr, or Xe) into the thin film of the compound, whereby electrons are substituted for the free oxygen ions.
[claim10]
10. An electron emission material comprising: the compound according to one of Claims 1 to 3.
[claim11]
11. A reducing material comprising: the compound according to one of Claims 1 to 3.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • HOSONO HIDEO
  • HIRANO MASAHIRO
  • HAYASHI KATSURO
  • MIYAKAWA MASASHI
  • TANAKA ISAO
IPC(International Patent Classification)
Reference ( R and D project ) ERATO HOSONO Transparent ElectroActive Materials AREA
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