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New modifications of Pb5Nb4O15 and Pb3Nb2O8

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The formation of Pb5Nb4O15 and Pb3Nb2O8 was studied using the powders prepared by the simultaneous hydrolysis of lead and niobium alkoxides. A new metastable modification of the former compound crystallized at low temperatures from an amorphous material. It had a cubic unit cell with a = 1.0674 nm. Two new modifications of the latter compound were found to exist. The metastable modification was formed by the solid-state reaction of cubic Pb5Nb4O15 and orthorhombic PbO. The crystal structure had a cubic symmetry with a = 1.0715 nm. The low-temperature modification was formed by transformation of the cubic phase. It was classified into monoclinic system with a = 1.2903 nm, b = 0.7394 nm, c = 3.3092 nm and β = 115.96°.

Affiliations: 1: Department of Chemical Engineering, Doshisha University, Kyoto 602, Japan; 2: Department of Applied Chemistry, Doshisha University, Kyoto 602, Japan


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