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- 저자 : J.S.Pshirkov (검색결과 1 건)
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The superconducting bismuth-based mixed oxides
E.V.Antipov,N.R.Khasanova,J.S.Pshirkov,S.N.Putilin,C.Bougerol,O.I.Lebedev,G.VanTendeloo,A.N.Baranov,Y.W.Park 한국물리학회 2002 Current Applied Physics Vol.2 No.5
The present paper describes the synthesis, characterization of mixed-valence bismuthates with three- or two-dimensional per-ovskite-like structures and structural criteria that inuence superconductivity in these compounds.Single-phase samples of Sr1. xKxBiO3 were prepared for the broad range of K-content: 0:256 x6 0:65. For these bismuthates thesymmetry of the structure changes from monoclinic to orthorhombic and nally to tetragonal upon increasing the K-content thusTc ¼ 12K exists in the narrow range (x . 0:50.6) within the stability eld of the tetragonal phase (0:336 x6 0:65), when the three-dimensional octahedral framework has close to the ideal perovskite structure arrangement.The layered type (Ba,K)3Bi2O7 and (Ba,K)2BiO4 bismuthates belonging to the Anþ 1BnO3nþ 1 homologous series were investi-gated. Buckling of the (BiO2 n ¼ 2 member occurs due to the ordering of alkaline- and alkaline-earthcations between two independent positions. The formation of the one-layer bismuthate was revealed by Electron Microscopy andXRPD studies. Both types of compounds are considered to be possible candidates for new superconducting materials amongbismuthates.. 2002 Published by Elsevier Science B.V.
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