Abstract: Provided is a metal oxide containing a brownmillerite-type manganese oxide represented by (Ca2-xAx)(MnyAlzE2-y-z)wO5+? (in the formula, A represents one or more alkaline earth metal elements other than Ca; E represents one or more 3d transition metal elements or earth metal elements other than Mn and Al; and x, y, z, ?, and w satisfy 0?x?2, 0<y?2, 0?z<2, 0<y+z?2, 0???0.5, and 0.8?w?1.2), wherein the metal oxide has a defect in a (020) plane of a crystal of the brownmillerite-type manganese oxide.

Abstract: A rotating electrical machine includes a stator, a rotor, a case, a seal member, and a terminal board. The stator has a conductor line wound thereon. The rotor is disposed inside the stator. The terminal board is to make an electrical connection between the conductor line and an external power line connected to a power supply. The terminal board is contained in the case and includes a relay conductor and a storage chamber containing the relay conductor. The relay conductor is to make a connection between the conductor line and the external power line. The storage chamber is hermetically closed by the seal member with respect to an outside of the case. The storage chamber has a discharge hole that allows communication between the storage chamber and the outside.

Abstract: A rotating electrical machine includes a stator, a rotor, a case, a seal member, and a terminal board. The stator has a conductor line wound thereon. The rotor is disposed inside the stator. The terminal board is to make an electrical connection between the conductor line and an external power line connected to a power supply. The terminal board is contained in the case and includes a relay conductor and a storage chamber containing the relay conductor. The relay conductor is to make a connection between the conductor line and the external power line. The storage chamber is hermetically closed by the seal member with respect to an outside of the case. The storage chamber has a discharge hole that allows communication between the storage chamber and the outside.

Abstract: A rotating electrical machine includes a stator, a housing, a first connection terminal, a terminal board, and a fastening member. The terminal board includes a body and a relay conductor to which the first connection terminal and a second connection terminal are connected. The relay conductor is provided in the body. The second connection terminal is connected to an external power line. The first connection terminal is connected to the relay conductor with the fastening member is screwed into an end portion of the relay conductor. The relay conductor is provided, under screwing action of the fastening member, to be moved toward the first connection terminal to be held in the body.