層状ペロブスカイト類似型化合物Ba_<3.64>(Pb_<2.64>Cu_<0.36>)O_<10-δ>の合成と物性 Preparation and Properties of Layered Perovskite Related Compound Ba_<3.64>(Pb_<2.64>Cu_<0.36>)O_<10-δ>
Phase relation could be elucidated between the two phases previously found out in BaPbO<SUB>3</SUB> -BaCuO<SUB>2</SUB> system by obtaining the single crystal product. Both phases have the molar ratio of Ba:Pb:Cu=1:0.725:0.10 and are basically isostructural to Ba<SUB>4</SUB>Pb<SUB>3</SUB>O<SUB>10</SUB> which is a member of Ruddlesden-Popper series Ba<SUB>n+1</SUB>Pb<SUB>n</SUB>O<SUB>3n+1</SUB>(n=3). They can be described as Ba<SUB>3.64</SUB>Pb<SUB>2.64</SUB>Cu<SUB>0.36</SUB>O<SUB>10</SUB>_δ. The phase 2 was an oxidized form of the phase 1 with an intercalation of 0.6H<SUB>2</SUB>O. The phase 1 crystallized in orthorhombic Immm with a=0.430(4), b=0.429(8), c=3.026(7)nm and was a semiconductor. The phase 2 crystallized in tetragonal P4/mmm with a=0.430(5), c=1.715(2)nm and was a semimetallic conductor.
粉体および粉末冶金 43(2), 151-156, 1996-02-15
Japan Society of Powder and Powder Metallurgy