Thermodynamically stable Si{sub w}C{sub x}N{sub y}O{sub z} polymer-like, amorphous ceramics made from organic precursors.
Journal Article
·
· J. Am. Ceram. Soc.
- Materials Science Division
This communication reports new results on the enthalpy of formation of pseudo-amorphous ceramic compounds constituted from silicon, carbon, oxygen, and nitrogen (SiCNO), made from the polymer route. Again, like the SiCO materials, although with one exception, the enthalpy of formation from crystalline components (SiO{sub 2} cristobalite, {beta}-Si{sub 3}N{sub 4}, SiC, and excess C) is negative. Some of the alloyed oxygen-nitrogen compositions yield enthalpies that are much more negative ({approx}100 kJ/g {center_dot} atom) in comparison with compositions that contain mainly oxygen or nitrogen ({approx}20 kJ/g {center_dot} atom). The exception, having a N/O ratio near 2, has a positive value for the enthalpy. This may reflect the presence of nanoclusters of stoichiometric Si{sub 2}N{sub 2}O instead of the pseudo-amorphous nanodomain structure seen for the other samples.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1009346
- Report Number(s):
- ANL/MSD/JA-68870
- Journal Information:
- J. Am. Ceram. Soc., Journal Name: J. Am. Ceram. Soc. Journal Issue: 7 ; Jul. 2008 Vol. 91; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Thermodynamics of the Si-O-N system. 2: Stability of Si{sub 2}N{sub 2}O(s) by high-temperature mass spectrometric vaporization
Enthalpy of formation of rare-earth silicates Y{sub 2}SiO{sub 5} and Yb{sub 2}SiO{sub 5} and N-containing silicate Y{sub 10}(SiO{sub 4}){sub 6}N{sub 2}
Energetics of Si{sub x}O{sub y}C{sub z} polymer-derived ceramics prepared under varying conditions.
Journal Article
·
Wed May 01 00:00:00 EDT 1996
· Journal of the American Ceramic Society
·
OSTI ID:253574
Enthalpy of formation of rare-earth silicates Y{sub 2}SiO{sub 5} and Yb{sub 2}SiO{sub 5} and N-containing silicate Y{sub 10}(SiO{sub 4}){sub 6}N{sub 2}
Journal Article
·
Wed Mar 31 23:00:00 EST 1999
· Journal of Materials Research
·
OSTI ID:348149
Energetics of Si{sub x}O{sub y}C{sub z} polymer-derived ceramics prepared under varying conditions.
Journal Article
·
Mon Sep 01 00:00:00 EDT 2008
· J. Am. Ceram. Soc.
·
OSTI ID:1007403