| 摘要 |
PURPOSE: To obtain a new manganese oxide-based material having a perovskite- type structure with switching function by forming single crystal, namely, grain boundary-free type crystal, from an oxide containing Mn, Pr and Ca or Sr in a fixed atomic ratio by a floating zone method. CONSTITUTION: This single crystal has a composition shown by the general formula, Pr1-x Mx MnO3 (M is Ca or Sr; (x) is 0.3-0.5). The single crystal is formed by blending Pr with Mn and Ca or Sr in an oxide or in the form of a compound to be converted into an oxide by heating in the atomic ratio of Pr to Mn of 0.5-0.7, of Ca or Sr to Mn of 0.5-0.3 and in the total of the atomic ratio of Pr and Ca or Sr of 1, burning in an oxygen atmosphere at 1,100-1,300 deg.C, then, grounding the sintered material, press molding into a columnar shape and growing crystal in an oxygen atmosphere at 3-5mm/h feed speed by a floating zone method into single crystal. |
