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Electroconductive 12CaO―7Al2O3 and compound of same type, and method for preparation thereof achieved

Foreign code F110005319
File No. E06014WO
Posted date Aug 31, 2011
Country United States of America
Application number 56196804
Gazette No. 20060151311
Gazette No. 7507289
Date of filing Feb 12, 2004
Gazette Date Jul 13, 2006
Gazette Date Mar 24, 2009
International application number JP2004001507
International publication number WO2005000741
Date of international filing Feb 12, 2004
Date of international publication Jan 6, 2005
Priority data
  • P2003-183605 (Jun 26, 2003) JP
  • 2004WO-JP01507 (Feb 12, 2004) WO
Title Electroconductive 12CaO―7Al2O3 and compound of same type, and method for preparation thereof achieved
Abstract (US7507289)
In a solid solution system of Al2O3 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.7Al2O3 compound, a 12SrO.7Al2O3 compound, or a mixed crystal compound containing 12CaO.7Al2O3 and 12SrO.7Al2O3.
The compound formed by substituting all the free oxygen ions with electrons is regarded as an electride compound in which [Ca24Al28O64]4+(4e-) or [Sr24Al28O64]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 method for manufacturing a 12CaO.7Al2O3 compound, a 12SrO.7Al2O3 compound, or a mixed crystal compound containing 12CaO.7Al2O3 and 12SrO.7Al2O3 comprising: electrons substituted for free oxygen ions at a concentration of 1 * 1018 to less than 1.1 * 1021/cm3 out of 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 2 * 1018 to less than 2.2 * 1021/cm3 in the cages, wherein the electrical conductivity at room temperature is in the range of 10-4 S/cm to less than 103S/cm, comprising the step of: holding a single crystal 12CaO.7Al2O3 compound or a hydrostatic pressure press molded material of a fine powder thereof, a single crystal 12SrO.7Al2O3compound or a hydrostatic pressure press molded material of a fine powder thereof, or a single crystal of a mixed crystal compound containing a 12CaO.7Al2O3 compound and a 12SrO.7Al2O3 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.
[claim2]
2. The method for manufacturing the compound, according to claim 1, wherein sodium or lithium is used as the alkaline metal, and magnesium or calcium is used as the alkaline earth metal.
[claim3]
3. A method for manufacturing the compound, according to claim 1, comprising: melting one fine powder of the 12CaO.7Al2O3 compound, the 12SrO.7Al2O3 compound, and the mixed crystal compound containing a 12CaO.7Al2O3 compound and a 12SrO.7Al2O3 compound, followed by cooling and solidification, whereby electrons are substituted for the free oxygen ions.
[claim4]
4. The method for manufacturing the compound, according to claim 3, wherein a melt of one fine powder of the 12CaO.7Al2O3 compound, the 12SrO.7Al2O3, and the mixed crystal compound containing a 12CaO.7Al2O3 compound and a 12SrO.7Al2O3 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.
[claim5]
5. The method for manufacturing the compound, according to claim 4, wherein the reducing atmosphere according to claim 4 is an atmosphere in a carbon crucible capped by a lid.
[claim6]
6. A method for manufacturing a 12CaO.7Al2O3 compound, a 12SrO.7Al2O3 compound, or a mixed crystal compound containing 12CaO.7Al2O3 and 12SrO.7Al2O3 comprising: electrons substituted for free oxygen ions at a concentration of 1 * 1018 to less than 1.1 * 1021/cm3 out of 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 2 * 1018 to less than 2.2 * 1021/cm3 in the cages, wherein the electrical conductivity at room temperature is in the range of 10-4 S/cm to less than 103 S/cm, comprising the steps of: holding one thin film made of the 12CaO.7Al2O3 compound, the 12SrO.7Al2O3 compound, or the mixed crystal compound containing a 12CaO.7Al2O3 compound and a 12SrO.7Al2O3 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.
[claim7]
7. The method for manufacturing the compound, according to claim 1, wherein an electride 12CaO.7Al2O3 compound comprising: electrons that are substituted for almost all the free oxygen ions contained in cages at a substitution ratio of the electrons (referred to as e-) to the oxygen ions of 2 to 1, the electride 12CaO.7Al2O3 compound being practically represented by [Ca24Al28O64] 4+(4e-).
[claim8]
8. The method for manufacturing the compound, according to claim 1, wherein an electride 12SrO.7Al2O3 compound comprising: electrons that are substituted for almost all the free oxygen ions contained in cages at a substitution ratio of the electrons to the oxygen ions of 2 to 1, the electride 12SrO.7Al2O3 compound being practically represented by [Sr24Al28O64]4+(4e-).
[claim9]
9. The method for manufacturing the compound, according to claim 1, wherein a mixed crystal electride compound containing a 12CaO.7Al2O3 compound and a 12SrO.7Al2O3 compound, comprising: electrons that are substituted for almost all the free oxygen ions contained in cages at a substitution ratio of the electrons to the oxygen ions of 2 to 1, the mixed crystal electride compound being practically represented by [(Ca1-xSrx)24Al28O64]4+(4e-).
  • Inventor, and Inventor/Applicant
  • HOSONO HIDEO
  • HIRANO MASAHIRO
  • HAYASHI KATSURO
  • MIYAKAWA MASASHI
  • TANAKA ISAO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) ERATO HOSONO Transparent ElectroActive Materials AREA
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