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Electroconductive 12cao.7al2o3, 12sro.7al2o3 or mixture thereof and method for preparation thereof 実績あり

外国特許コード F110003901
整理番号 E06014WO
掲載日 2011年7月6日
出願国 欧州特許庁(EPO)
出願番号 04710529
公報番号 1650164
公報番号 1650164
出願日 平成16年2月12日(2004.2.12)
公報発行日 平成18年4月26日(2006.4.26)
公報発行日 平成27年12月30日(2015.12.30)
国際出願番号 JP2004001507
国際公開番号 WO2005000741
国際出願日 平成16年2月12日(2004.2.12)
国際公開日 平成17年1月6日(2005.1.6)
優先権データ
  • 2004JP001507 (2004.2.12) WO
  • 特願2003-183605 (2003.6.26) JP
発明の名称 (英語) Electroconductive 12cao.7al2o3, 12sro.7al2o3 or mixture thereof and method for preparation thereof 実績あり
発明の概要(英語) 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.
特許請求の範囲(英語) [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.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • HOSONO HIDEO
  • HIRANO MASAHIRO
  • HAYASHI KATSURO
  • MIYAKAWA MASASHI
  • TANAKA ISAO
国際特許分類(IPC)
欧州特許分類/主・副
  • C01F007/16D
  • C01F007/16F
  • C04B035/44
  • C04B035/653
  • H01B001/08
  • M01P006/40
  • M04B235/32D4
  • M04B235/32D6
  • M04B235/604
  • M04B235/658R
  • M04B235/660B4D
  • M04B235/78P
  • M04B235/94
指定国 Contracting States: DE FR GB
参考情報 (研究プロジェクト等) ERATO HOSONO Transparent ElectroActive Materials AREA
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