A New Pyrochlore System, Pb(Ti<I><SUB>x</SUB></I>·Sn<SUB>1–<I>x</I></SUB>)O<SUB>3</SUB>, and Its Transition to a Perovskite System
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概要
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A series of pyrochlore compounds of Pb(Ti<I><SUB>x</SUB></I>·Sn<SUB>1–<I>x</I></SUB>)O<SUB>3</SUB>, was aqueously prepared. They were characterized in terms of inhomogeneously distributed Ti and Sn ions in the equivalent lattice positions. In the composition range where the value <I>x</I> was between 0.00 and 0.45, monophasic pyrochlore was crystallized. In the composition range of <I>x</I>\gtrsim0.45, however, the pyrochlore phase more or less coexisted with a noncrystalline substance whose composition was supposed to be Pb/(Ti+Sn) mole ratio <1.0. The process of thermal transition from the pyrochlore-type Pb(Ti<SUB>0.4</SUB>·Sn<SUB>0.6</SUB>)O<SUB>3</SUB> to the perovskite-type system was traced by two lines of measurements of the pyrochlore, <I>i.e.</I>, the lattice constant and the degree of fluctuation of interplanar spacings, and by measurements of the tetragonal lattice strain of the resultant perovskite. The results showed that the transition occurred preferentially at Ti-rich microregions in the matrix lattice, in which a measurable fluctuation of the Sn: Ti ratio was detected.
- 公益社団法人 日本化学会の論文
著者
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TAKAHASHI Koichiro
National Institute for Research in Inorganic Materials
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MURAMATSU Kunitaka
National Institute for Research in Inorganic Materials
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Shirasaki Shin-ichi
National Institute For Reseaches In Inorganic Materials
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YAMAMURA Hiroshi
National Institute for Reseaches in Inorganic Materials
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