Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | I/- |
| Fachzeitschrift | Materials Science Forum |
| Jahrgang | 343 |
| Publikationsstatus | Veröffentlicht - Mai 2000 |
| Veranstaltung | ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Dresden, Ger Dauer: 30 Aug. 1999 → 3 Sept. 1999 |
Abstract
We produced heterogeneous mixtures of nanocrystalline ceramic materials. An ionic conductor is mixed with an insulator resulting in a heterogeneous material consisting of conducting grains, insulating grains, interfacial regions between equal grains and interfacial regions between different grains. The system studied is (1-x)Li2O:xB2O3 with x = 0...1 and it serves as a model system for new materials which could be used as, e.g., solid state electrolytes. The lithium diffusion in this material is being studied with impedance and NMR spectroscopy. The single nanocrystalline components Li2O and B2O3 were produced in a high energy ball mill (SPEX 8000) by milling the polycrystalline source materials (grain size≈10 μm). The milling time was varied between 1 and 16 hours which resulted in an average grain size between 40 nm and 20 nm. All preparation steps were performed under argon atmosphere because Li2O is unstable in air. The average grain size was determined by the line broadening of x-ray diffraction patterns. Using the method of Warren and Averbach we were able to determine also the variance of the distribution of grain sizes. The appropriate amounts of the components were then mixed together, milled again for 15 minutes and then pressed to pellets. Density measurements showed that the density of the nanocrystalline samples was reduced by 15% compared to the polycrystalline material. For comparison we also prepared polycrystalline composites. XRD and DSC measurements were used to determine the thermal stability of the samples.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
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in: Materials Science Forum, Jahrgang 343, 05.2000, S. I/-.
Publikation: Beitrag in Fachzeitschrift › Konferenzaufsatz in Fachzeitschrift › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanochemical preparation and characterization of nanocrystalline ceramic composites
AU - Indris, S.
AU - Heitjans, P.
PY - 2000/5
Y1 - 2000/5
N2 - We produced heterogeneous mixtures of nanocrystalline ceramic materials. An ionic conductor is mixed with an insulator resulting in a heterogeneous material consisting of conducting grains, insulating grains, interfacial regions between equal grains and interfacial regions between different grains. The system studied is (1-x)Li2O:xB2O3 with x = 0...1 and it serves as a model system for new materials which could be used as, e.g., solid state electrolytes. The lithium diffusion in this material is being studied with impedance and NMR spectroscopy. The single nanocrystalline components Li2O and B2O3 were produced in a high energy ball mill (SPEX 8000) by milling the polycrystalline source materials (grain size≈10 μm). The milling time was varied between 1 and 16 hours which resulted in an average grain size between 40 nm and 20 nm. All preparation steps were performed under argon atmosphere because Li2O is unstable in air. The average grain size was determined by the line broadening of x-ray diffraction patterns. Using the method of Warren and Averbach we were able to determine also the variance of the distribution of grain sizes. The appropriate amounts of the components were then mixed together, milled again for 15 minutes and then pressed to pellets. Density measurements showed that the density of the nanocrystalline samples was reduced by 15% compared to the polycrystalline material. For comparison we also prepared polycrystalline composites. XRD and DSC measurements were used to determine the thermal stability of the samples.
AB - We produced heterogeneous mixtures of nanocrystalline ceramic materials. An ionic conductor is mixed with an insulator resulting in a heterogeneous material consisting of conducting grains, insulating grains, interfacial regions between equal grains and interfacial regions between different grains. The system studied is (1-x)Li2O:xB2O3 with x = 0...1 and it serves as a model system for new materials which could be used as, e.g., solid state electrolytes. The lithium diffusion in this material is being studied with impedance and NMR spectroscopy. The single nanocrystalline components Li2O and B2O3 were produced in a high energy ball mill (SPEX 8000) by milling the polycrystalline source materials (grain size≈10 μm). The milling time was varied between 1 and 16 hours which resulted in an average grain size between 40 nm and 20 nm. All preparation steps were performed under argon atmosphere because Li2O is unstable in air. The average grain size was determined by the line broadening of x-ray diffraction patterns. Using the method of Warren and Averbach we were able to determine also the variance of the distribution of grain sizes. The appropriate amounts of the components were then mixed together, milled again for 15 minutes and then pressed to pellets. Density measurements showed that the density of the nanocrystalline samples was reduced by 15% compared to the polycrystalline material. For comparison we also prepared polycrystalline composites. XRD and DSC measurements were used to determine the thermal stability of the samples.
UR - http://www.scopus.com/inward/record.url?scp=0033719849&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.343-346.417
DO - 10.4028/www.scientific.net/MSF.343-346.417
M3 - Conference article
AN - SCOPUS:0033719849
VL - 343
SP - I/-
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
T2 - ISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials
Y2 - 30 August 1999 through 3 September 1999
ER -