Abstract: Magnetic refrigerating device improves refrigerating capacity and efficiency by improving the heat exchanging method between a magnetic material and a heat exchanging fluid and devising a magnetic field applying method. The magnetic refrigerating device comprises: a cylindrical active magnetic regenerator (AMR) bed accommodating refrigerant therein; two magnetic materials disposed in the AMR bed in the axial direction, configured to be movable in the axial direction of the AMR bed, and made of material having a magnetocaloric effect; at least two permanent magnets positioned to face the two magnetic materials; a rotary shaft positioned between the two magnetic materials in the AMR bed and positioned between the at least two permanent magnets; and a magnetic rotary movement unit that rotationally moves the permanent magnets about the rotary shaft and that repeatedly moves the permanent magnets and the two magnetic materials closer together and farther apart in association with the rotational movement.

Abstract: Magnetic refrigerating device improves refrigerating capacity and efficiency by improving the heat exchanging method between a magnetic material and a heat exchanging fluid and devising a magnetic field applying method. The magnetic refrigerating device comprises: a cylindrical active magnetic regenerator (AMR) bed accommodating refrigerant therein; two magnetic materials disposed in the AMR bed in the axial direction, configured to be movable in the axial direction of the AMR bed, and made of material having a magnetocaloric effect; at least two permanent magnets positioned to face the two magnetic materials; a rotary shaft positioned between the two magnetic materials in the AMR bed and positioned between the at least two permanent magnets; and a magnetic rotary movement unit that rotationally moves the permanent magnets about the rotary shaft and that repeatedly moves the permanent magnets and the two magnetic materials closer together and farther apart in association with the rotational movement.

Abstract: An oxide regenerator material, which has a nominal composition of MxAl2−xO3, wherein M is one or more rare earth elements and x is a number which meets an inequality expressed 1≦x≦1.5.

Abstract: A low-temperature phase oxide single crystal having a nominal composition of Ba(B.sub.1-x M.sub.x).sub.2 O.sub.4 is synthesized by partially substituting B of BaB.sub.2 O.sub.4 with one or more additive elements M and by growing the single crystal in a Ba(B.sub.1-x M.sub.x).sub.2 O.sub.4 composition compound (where M is one or more additive elements selected from the group consisting of Al, Ga and In, and 0.001<x<0.15).