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IRON-CONTAINING SUPERCONDUCTIVE SUBSTANCE, AND METHOD FOR PRODUCING SAME

Foreign code F150008377
Posted date Jul 13, 2015
Country WIPO
International application number 2014JP072770
International publication number WO 2015045733
Date of international filing Aug 29, 2014
Date of international publication Apr 2, 2015
Priority data
  • P2013-199997 (Sep 26, 2013) JP
Title IRON-CONTAINING SUPERCONDUCTIVE SUBSTANCE, AND METHOD FOR PRODUCING SAME
Abstract The purpose of the present invention is to provide an iron-containing superconductive substance comprising an interlayer substance having a low rare earth element content. A superconductive substance which is characterized by being represented by the chemical formula: Ca1-xRxFeAs2, being of a CaFeAs2 type, and having a crystal structure of a space group P21, wherein R represents at least one light rare earth element selected from La, Ce, Pr and Nd and the atomic ratio (x) is 0.08 to 0.24 inclusive (i.e., 0.08 ≤ x ≤ 0.24). The CaFeAs2-type structure is a structure in which a FeAs layer and a Ca1-xRxAs layer are laminated alternately, the Ca1-xRxAs layer comprises a three-layer interlayer substance, i.e., (a Ca1-xRx layer)-(an As2 layer)-(a Ca1-xRx layer), and R is doped to produce the superconductive substance.
Scope of claims (In Japanese)[請求項1]
化学式Ca1-xRxFeAs2で示され、CaFeAs2型で、空間群P21の結晶構造を有し、Rは、La、Ce、Pr、Ndから選ばれる少なくとも1つの軽希土類元素であり、原子比xが0.08≦x≦0.24であることを特徴とする超電導物質。
[請求項2]
前記CaFeAs2型構造は、FeAs層とCa1-xRxAs層の交互積層構造であり、Ca1-xRxAs層が、Ca1-xRx層-As2層-Ca1-xRx層の3層からなる層間物質であり、Rは、La、Ce、Pr、Ndから選ばれる少なくとも1つの軽希土類元素であり、Rをドープすることにより前記超電導物質となることを特徴とする層状化合物。
[請求項3]
原料として、Caの粒又は粉末、前記R元素の粒又は粉末、FeAsの粒又は粉末、Asの粒又は粉末を組成比がCa1-xRxFeAs2(ただし、0.08≦x≦0.24)となるように秤量し、混合し、混合粒又は混合粉末を不活性雰囲気又は真空中、1050℃~1100℃で溶融して合成反応させることを特徴とする請求項1に記載の超電導物質の製造法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • OKAYAMA UNIVERSITY
  • NAGOYA UNIVERSITY
  • TOKYO INSTITUTE OF TECHNOLOGY
  • Inventor
  • SAWA HIROSHI
  • KATAYAMA NAOYUKI
  • HOSONO HIDEO
  • NOHARA MINORU
  • KUDO KAZUTAKA
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR KZ LA LC LK LR LS LT LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN TD TG
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