Ion conduction and dynamics in mechanosynthesized nanocrystalline BaLiF3

被引：12

作者：

Duevel, A. ^{[1
,2
]}

Wilkening, M. ^{[1
,2
]}

Wegner, S. ^{[3
]}

Feldhoff, A. ^{[1
,2
]}

Sepelak, V. ^{[2
,4
]}

Heitjans, P. ^{[1
,2
]}

机构：

[1] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany

[2] Leibniz Univ Hannover, Ctr Solid State Chem & New Mat ZFM, D-30167 Hannover, Germany

[3] Bruker BioSpin GmbH, D-76287 Silberstreifen, Germany

[4] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

来源：

SOLID STATE IONICS | 2011年 / 184卷 / 01期

关键词：

Mechanochemistry; Milling; Nanocrystalline; Impedance spectroscopy; Conductivity; Solid state NMR; OXIDE; NMR; DIFFUSIVITY; CRYSTAL; MODEL;

D O I：

10.1016/j.ssi.2010.08.025

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Highly pure nanocrystalline BaLiF3 (space group Pm (3) over barm, inverse perovskite structure) with a mean crystallite size of the order of 30 nm was mechanosynthesized from the binary fluorides LiF and BaF2. The source materials with mu m-sized crystallites were treated in a planetary mill for several hours at ambient temperature. The product is characterized by X-ray diffraction and transmission electron microscopy. Its ionic conductivity was probed by solid state impedance spectroscopy. For comparison, a coarse-grained sample of BaLiF3 with a mean crystallite diameter in the pm range was synthesized by conventional high-temperature ceramic synthesis. The ionic conductivity (dc) of the mechanosynthesized nanocrystalline sample, which is characterized by a large fraction of interfacial regions, is by about three orders of magnitude (T = 570 K) larger than that of the conventionally prepared one. Preliminary temperature-variable Li-7 NMR spectra provide first insights into the Li dynamics of the samples studied. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：65 / 69

页数：5

共 26 条

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