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Author Düvel, A. ♦ Wilkening, M. ♦ Uecker, R. ♦ Heitjans, P.
Source CiteSeerX
Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword High-energy Ball Milling ♦ Ion Transport Property ♦ Inverse Perovskite Balif3 Prepared ♦ Many Case ♦ M-sized Particle ♦ Important Role ♦ Fritsch P7 Planetary Mill ♦ Rotational Speed ♦ Many Application ♦ Coarse-grained Counterpart ♦ Crystallite Diameter ♦ Nm Show ♦ Mechanical Treatment ♦ Electrochromic Device ♦ Following Conventional Synthesis Method ♦ Single Crystal ♦ Nanocrystalline Ceramic ♦ High-energy Ball Mill ♦ Nanocrystalline Material ♦ Large Fraction ♦ Ball Milling ♦ Non-equilibrium Compound ♦ X-ray Diffraction ♦ Pure Balif3 ♦ Fast Migration Pathway ♦ Advanced Energy Storage System ♦ Premium Line ♦ Average Crystallite Size ♦ Large Quantity ♦ Simple Technique ♦ Interfacial Region ♦ Enhanced Ion Conductivity ♦ Chemical Sensor ♦ Ionic Conduction ♦ Ml Zirconia Vial ♦ Overall Mass ♦ Present Paper ♦ Equimolar Mixture
Abstract For many applications such as advanced energy storage systems, chemical sensors or electrochromic devices fast ionic conduction plays an important role. In many cases, see e.g., Refs. [1-3], nanocrystalline ceramics with crystallite diameters smaller than 50 nm show an enhanced ion conductivity compared to their coarse-grained counterparts, i.e., single crystals or materials with µm-sized particles. This observation can be explained by their large fraction of structurally disordered interfacial regions providing fast migration pathways for the ions [2,3]. Mechanical treatment of µm-sized particles in a high-energy ball mill represents a simple technique to obtain large quantities of a nanocrystalline material. In addition to that it is also possible to synthesize ceramics directly by ball milling [3]. In many cases this leads to metastable, non-equilibrium compounds which cannot be prepared following conventional synthesis methods [4,5]. In the present paper, BaLiF3, the only known inverted perovskite of the AMF3 compounds [6], was prepared by high-energy ball milling using a Fritsch P7 planetary mill (premium line). An equimolar mixture of LiF and BaF2 with an overall mass of 2 g was treated in a 45 mL zirconia vial with 140 balls of the same material for 3 h at a rotational speed of 600 rpm. As verified by X-ray diffraction highly pure BaLiF3 is obtained which shows an average crystallite size d of about 30 nm. d was estimated
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