Details
| Original language | English |
|---|---|
| Pages (from-to) | 10153-10162 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry C |
| Volume | 123 |
| Issue number | 15 |
| Early online date | 25 Mar 2019 |
| Publication status | Published - 18 Apr 2019 |
Abstract
Glassy materials with specific functions are almost universally used in our daily life. If prepared via quenching, that is, by rapid cooling of the molten glass, a frozen liquid with a high degree of lattice disorder and stress is obtained. The release of stress through mechanical action may significantly affect the microstructure and dynamic features of the so-obtained nanoglass. Considering ion conducting glasses, it has recently been shown that mechanical treatment of glasses causes the long-range ion transport to significantly decrease. The origin of this astonishing behavior of nanoglasses is, however, far from being understood completely. Here, we show that depending on the duration of mechanical impact in a high-energy planetary ball mill, the petalite glass, LiAlSi4O10, passes through a state with two Li reservoirs distinctly differing in electrical relaxation and, thus, in ion transport. The two species, characterized by electrical relaxation rates differing by two orders of magnitude, show up clearly if we use the electric modulus representation to analyze the data. This feature is also seen in conductivity spectra revealing a two-step increase of the conductivity with frequency. Accordingly, we propose a two-phase model with nanometer-sized non-relaxed glassy particles next to or surrounded by structurally relaxed regions.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 123, No. 15, 18.04.2019, p. 10153-10162.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Glass in Two Forms
T2 - Heterogeneous Electrical Relaxation in Nanoglassy Petalite
AU - Gadermaier, Bernhard
AU - Stanje, Bernhard
AU - Wilkening, Alexandra
AU - Hanzu, Ilie
AU - Heitjans, Paul
AU - Wilkening, H. Martin R.
N1 - Funding information: Financial support by the Austrian Federal Ministry of Science, Research and Economy (BMWFW) and the National Foundation for Research, Technology and Development (CD-Laboratory of Lithium Batteries: Ageing Effects, Technology and New Materials) is gratefully acknowledged. Moreover, we appreciate support by NAWI Graz and thank the German Research Foundation (DFG) for financial support (WI3600, 2-1/4-1; HE1574, 14-2). P.H. is grateful to the State of Lower Saxony (Germany) for a Niedersachsen Professorship.
PY - 2019/4/18
Y1 - 2019/4/18
N2 - Glassy materials with specific functions are almost universally used in our daily life. If prepared via quenching, that is, by rapid cooling of the molten glass, a frozen liquid with a high degree of lattice disorder and stress is obtained. The release of stress through mechanical action may significantly affect the microstructure and dynamic features of the so-obtained nanoglass. Considering ion conducting glasses, it has recently been shown that mechanical treatment of glasses causes the long-range ion transport to significantly decrease. The origin of this astonishing behavior of nanoglasses is, however, far from being understood completely. Here, we show that depending on the duration of mechanical impact in a high-energy planetary ball mill, the petalite glass, LiAlSi4O10, passes through a state with two Li reservoirs distinctly differing in electrical relaxation and, thus, in ion transport. The two species, characterized by electrical relaxation rates differing by two orders of magnitude, show up clearly if we use the electric modulus representation to analyze the data. This feature is also seen in conductivity spectra revealing a two-step increase of the conductivity with frequency. Accordingly, we propose a two-phase model with nanometer-sized non-relaxed glassy particles next to or surrounded by structurally relaxed regions.
AB - Glassy materials with specific functions are almost universally used in our daily life. If prepared via quenching, that is, by rapid cooling of the molten glass, a frozen liquid with a high degree of lattice disorder and stress is obtained. The release of stress through mechanical action may significantly affect the microstructure and dynamic features of the so-obtained nanoglass. Considering ion conducting glasses, it has recently been shown that mechanical treatment of glasses causes the long-range ion transport to significantly decrease. The origin of this astonishing behavior of nanoglasses is, however, far from being understood completely. Here, we show that depending on the duration of mechanical impact in a high-energy planetary ball mill, the petalite glass, LiAlSi4O10, passes through a state with two Li reservoirs distinctly differing in electrical relaxation and, thus, in ion transport. The two species, characterized by electrical relaxation rates differing by two orders of magnitude, show up clearly if we use the electric modulus representation to analyze the data. This feature is also seen in conductivity spectra revealing a two-step increase of the conductivity with frequency. Accordingly, we propose a two-phase model with nanometer-sized non-relaxed glassy particles next to or surrounded by structurally relaxed regions.
UR - http://www.scopus.com/inward/record.url?scp=85064331527&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.9b01423
DO - 10.1021/acs.jpcc.9b01423
M3 - Article
AN - SCOPUS:85064331527
VL - 123
SP - 10153
EP - 10162
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 15
ER -