title: Rapid and direct synthesis of complex perovskite oxides through a highly energetic planetary milling.
abstract: 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)TiO3, (K, Na)NbO3and 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)TiO3and ca. 580 kJ/g for (K, Na)NbO3. 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.
authors.affiliation: Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
authors.forename: Gyoung-Ja
authors.initials: GJ
authors.lastname: Lee
authors.affiliation: Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
authors.forename: Eun-Kwang
authors.initials: EK
authors.lastname: Park
authors.affiliation: Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
authors.forename: Sun-A
authors.initials: SA
authors.lastname: Yang
authors.affiliation: Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
authors.forename: Jin-Ju
authors.initials: JJ
authors.lastname: Park
authors.affiliation: Department of Physics and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju 54896, Republic of Korea.
authors.forename: Sang-Don
authors.initials: SD
authors.lastname: Bu
authors.affiliation: Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
authors.forename: Min-Ku
authors.initials: MK
authors.lastname: Lee