TY - JOUR
T1 - Transport in glassy fast-ion conductors. A stud of LiAlSiO4 glass
AU - Pechenik, Alexander
AU - Whitmore, D. H.
AU - Susman, S.
AU - Ratner, Mark A.
N1 - Funding Information:
We are grateful to the NSF-MRL program for partial support of this work through the North-western MRC (Contract DMR-82-16972) and to the DOE (DE-FG02-85ER45198) and AFOSR (82-02213) for partial support. We would like to thank the referee for his very constructive and valuable comments.
PY - 1988/4
Y1 - 1988/4
N2 - The mechanism of ionic motion in LiAlSiO4 glass is investigated using a combination of structural (vibrational spectroscopy, X-ray diffraction) and transport (ionic conductivity) methods. We find that the material is quite a good Li+ conductor (σ ≈ 10-3 μ-1 cm-1 at 500 °C), and that the vibrational density of states deduced from spectroscopic studies agrees very well with the continuous random network model. Moreover, the tendency towards ordering seen in many aluminosilicates and described by Loewenstein's rule is discussed in the context of our spectroscopic observations, and we find that the Loewenstein rule also holds approximately in this glassy material. The rigidly alternating potential seen by Li+ ions in crystalline LiAlSiO4 (β-eucryptite) is substantially altered by the disorder present in the glass. This disorder strongly reduces correlation effects on ionic motion in the glass, as opposed to the crystal, resulting in a smaller activation energy for conductivity in the glass.
AB - The mechanism of ionic motion in LiAlSiO4 glass is investigated using a combination of structural (vibrational spectroscopy, X-ray diffraction) and transport (ionic conductivity) methods. We find that the material is quite a good Li+ conductor (σ ≈ 10-3 μ-1 cm-1 at 500 °C), and that the vibrational density of states deduced from spectroscopic studies agrees very well with the continuous random network model. Moreover, the tendency towards ordering seen in many aluminosilicates and described by Loewenstein's rule is discussed in the context of our spectroscopic observations, and we find that the Loewenstein rule also holds approximately in this glassy material. The rigidly alternating potential seen by Li+ ions in crystalline LiAlSiO4 (β-eucryptite) is substantially altered by the disorder present in the glass. This disorder strongly reduces correlation effects on ionic motion in the glass, as opposed to the crystal, resulting in a smaller activation energy for conductivity in the glass.
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U2 - 10.1016/0022-3093(88)90368-7
DO - 10.1016/0022-3093(88)90368-7
M3 - Article
AN - SCOPUS:0023997379
SN - 0022-3093
VL - 101
SP - 54
EP - 64
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 1
ER -