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2017 ; 7
(ä): 46241
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Rapid and direct synthesis of complex perovskite oxides through a highly
energetic planetary milling
#MMPMID28387324
Lee GJ
; Park EK
; Yang SA
; Park JJ
; Bu SD
; Lee MK
Sci Rep
2017[Apr]; 7
(ä): 46241
PMID28387324
show ga
The search for a new and facile synthetic route that is simple, economical and
environmentally safe is one of the most challenging issues related to the
synthesis of functional complex oxides. Herein, we report the expeditious
synthesis of single-phase perovskite oxides by a high-rate mechanochemical
reaction, which is generally difficult through conventional milling methods. With
the help of a highly energetic planetary ball mill, lead-free piezoelectric
perovskite oxides of (Bi, Na)TiO(3), (K, Na)NbO(3) and their modified complex
compositions were directly synthesized with low contamination. The reaction time
necessary to fully convert the micron-sized reactant powder mixture into a
single-phase perovskite structure was markedly short at only 30-40?min regardless
of the chemical composition. The cumulative kinetic energy required to overtake
the activation period necessary for predominant formation of perovskite products
was ca. 387?kJ/g for (Bi, Na)TiO(3) and ca. 580?kJ/g for (K, Na)NbO(3). The
mechanochemically derived powders, when sintered, showed piezoelectric
performance capabilities comparable to those of powders obtained by conventional
solid-state reaction processes. The observed mechanochemical synthetic route may
lead to the realization of a rapid, one-step preparation method by which to
create other promising functional oxides without time-consuming homogenization
and high-temperature calcination powder procedures.