RARE EARTH METAL ELEMENT-CONTAINING CRYSTALLINE METAL OXIDE FIBER AND METHOD FOR PRODUCING THE SAME

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PROBLEM TO BE SOLVED : To provide a rare earth metal element-containing metal oxide fiber finely dispersing the rare earth metal element and having a small and uniform fiber diameter with heat resistance and to provide a method for producing the fiber. SOLUTION : The rare earth metal element-containing crystalline metal oxide fiber is a crystalline fiber consisting essentially of a metal oxide and containing the rare earth metal element. The rare earth metal element-containing crystalline metal oxide fiber is obtained by preparing a composition for forming the fiber using a water-soluble rare earth metal compound and forming the fiber from the composition for forming the fiber by an electrospinning method. The fiber has ≥50 to ≤1, 000 nm average fiber diameter without containing a part to provide ≥2, 000 nm fiber diameter and has ≥10 μm fiber length. COPYRIGHT : (C)2008, JPO&INPIT