ソフトメカノケミカル複合化法によるペロブスカイト単相0.9PMN-0.1PT 複合酸化物の調整と生成機構 Preparation and Mechanism of Formation for Perovskite Solid-Solution 0.9PMN-0.1PT via a Soft-mechanochemical Route
The formation process of perovskite solid-solution 0.9Pb(Mg<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)-0.1PbTiO<SUB>3</SUB> (0.9PMN-0.1PT) from a stoichiometric mixture of PbO, Nb<SUB>2</SUB>O<SUB>5</SUB>, TiO<SUB>2</SUB> and Mg(OH)<SUB>2</SUB> by a soft-mechanochemical technique was studied. Single phase of perovskite 0.9PMN-0.1PT powder was obtained after heating at 850°C for 4 h of the mechanically activated precursor with a stoichiometric composition maintained. After milling a starting mixture for 60 min, Nb<SUP>5+</SUP> was locally reduced to Nb<SUP>2+</SUP> and the amount of -OH in Mg(OH)<SUB>2</SUB> decreased, as confirmed by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR), respectively. Formation of precursors seems to be accomplished by preferential solid-state acid/base reactions between Nb<SUB>2</SUB>O<SUB>5</SUB> and Mg(OH)<SUB>2</SUB> under mechanical stress. All these observations consistently explain the enhanced rate of formation of perovskite solid-solution 0.9PMN-0.1 PT from the mechanically activated mixture on subsequent heating.
粉体および粉末冶金 43(6), 712-721, 1996-06-15
Japan Society of Powder and Powder Metallurgy