強誘電体Pb(Fe_<2/3>W_<1/3>)O_3の沈殿合成と生成過程 : 合成・キャラクタリーゼーション

概要

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Ferroelectric Pb(Fe_<2/3>W_<l/3>)O_3 was synthesized by a new two-stage precipitation process. On heating precipitates, PbWO_4 pyrochlore phase, and Pb(Fe_<2/3>W_<l/3>)O_3 formed as major reactants at 300℃, 510℃, and 700℃, respectively. A small amount of a liquid phase that accelerated densification was also found at 680℃. A pure compound of Pb(Fe_<2/3>W_<l/3>)O_3 formed at 870℃. However, it melted incongruently at 930℃ to form Pb_2WO_5 and facet-shaped magnetic PbFe_<12>O_<19> The predominant formation mechanism of precipitation-derived Pb(Fe_<2/3>W_<1/3>)O_3 is considered to include the formation of pyrochlore phase and its subsequent reaction to form Pb(Fe_<2/3>W_<1/3>)O_3. The formation process of Pb(Fe_<2/3>W_<1/3>)O_3 in the precipitation method is relatively simple in comparison with the solid-state reaction. This is attributed to the improved homogeneity and reactivity of the starting materials in precipitates.
1990-08-01