NOVELTY - A composite material contains ceramic coated particles containing iron-type perovskite-type oxide (I), whose core surface containing metal which catalyzes ionization of oxygen, is coated with porous ceramic.    USE - Composite material is used for forming cathode of solid-oxide fuel cell for manufacturing solid oxide fuel cell system (all claimed).    ADVANTAGE - The composite material efficiently forms cathode with high battery characteristics, and suppressed generation of solid phase reaction. The solid oxide fuel cell system using the composite material has excellent electric power generation efficiency.    DETAILED DESCRIPTION - A composite material contains ceramic coated particles containing iron-type perovskite-type oxide of formula: (Ln1-xAex)(M1-yFey)O3-a (I), whose core surface containing metal which catalyzes ionization of oxygen, is coated with porous ceramic.    Ln=lanthanoid;    Ae=Sr, Ba or Ca;    M=Ti, Ni, Al, Zr, Ga, Mg, Cu, In, Sn, V, Cr, Zn, Ge, Sc or Y;    x=0 or more and less than 1;    y=more than 0 and 1 or less;and    a=value which maintains electric charge neutral charge.    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of solid oxide fuel cell system, which involves forming junction portion by joining connection component to cells, preparing anode solid electrolyte (20) laminate containing anode (10) and solid electrolyte, providing the composite material on the surface of the solid electrolyte of the laminate, provided bonding material containing junction component (40) which joins the laminate, or laminate and connection component, baking and forming cathode (30) and said junction component; and    (2) solid-oxide fuel cell, which has anode, solid electrolyte, and cathode formed using the composite material.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of solid oxide fuel cell system.    Anode (10)    Solid electrolyte (20)    Cathode (30)    Junction component (40)    Gas pipe (60)    Solid oxide fuel cell (100)