Open AccessEffect of microstructure and surface impurity segregation on the electrical and electrochemical properties of dense Al-substituted Li7La3Zr2O12
Author(s) -
Lei Cheng,
Joong Sun Park,
Huaming Hou,
Vassilia Zorba,
Guoying Chen,
Thomas J. Richardson,
Jordi Cabana,
Richard E. Russo,
Marca M. Doeff
Publication year - 2013
Publication title -
journal of materials chemistry a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.637
H-Index - 212
eISSN - 2050-7488
pISSN - 2050-7496
DOI - 10.1039/c3ta13999a
Subject(s) - impurity , materials science , scanning electron microscope , microstructure , pellets , analytical chemistry (journal) , dielectric spectroscopy , spectroscopy , energy dispersive x ray spectroscopy , grain size , sintering , electrochemistry , metallurgy , composite material , chemistry , physics , organic chemistry , electrode , chromatography , quantum mechanics
Al-substituted Li7La3Zr2O12 (LLZO) pellets with a grain size of 100–200 μm and a relative density of 94% were prepared by conventional solid-state processing at a sintering temperature of 1100 °C, 130 °C lower than previously reported. Morphological features and the presence of impurities were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Femtosecond Laser Induced Breakdown Spectroscopy (LIBS) was used to visualize the distribution of impurities. The results suggest that chemical composition of the powder cover strongly affects morphology and impurity formation, and that particle size control is critical to densification. These properties, in turn, strongly affect total ionic conductivity and interfacial resistance of the sintered pellets.
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