Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1995-11-03
1997-09-09
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
501 86, 117 49, C04B 3550, C30B 1300
Patent
active
056656645
ABSTRACT:
Proposed is a grain boundary-free crystalline body of a perovskite structure having a chemical composition of the formula Pr.sub.1-x M.sub.x MnO.sub.3, in which M is calcium or strontium and the subscript x is a number of 0.3 to 0.5, which exhibits a magnetoresistance behavior with a phase transition between an insulator phase and a ferromagnetic metallic phase accompanied by the phenomenon of hysteresis. This grain boundary-free crystalline body can be obtained by subjecting a sintered body of a powder blend consisting of the oxides of praseodymium, manganese and calcium or strontium to a crystal growing treatment by the floating zone-melting method in an atmosphere of oxygen.
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Y. Tomioka et al., "Anomalous Magnetotransport Properties of Pr.sub.1-x Ca.sub.x MnO.sub.3 ", J. Phys. Soc. Jpn., vol. 64, No. 10 Oct. 1995, pp. 3626-3630.
Y. Tomioka et al. "Collapse of a Charge-Ordered State under Magnetic Field in Pr.sub.0.5 Sr.sub.0.5 MnO.sub.3 ", Phys. Rev. Lett., vol. 74, No. 25, Jun. 1995, pp. 5108-1111.
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Tokura Yoshinori
Tomioka Yasuhide
Angstrom Technology Partnership
Bell Mark L.
Japan as represented by Director General of Agency of Industrial
Troilo Louis M.
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