Processing, structure, and thermal properties of ZrW2O8, HfW2O8, HfMgW3O12, Al(HfMg)0.5W3O12, and Al0.5Sc1.5W3O12 negative and zero thermal expansion coefficient ceramics
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Negative and zero coefficient of thermal expansion (CTE) materials are of interest for developing polymer composites in electronic circuits that match the expansion of Si and in zero CTE supports for optical components, e.g., mirrors. In this work, the processing challenges and stability of ZrW2O8, HfW2O8, HfMgW3O12, Al(HfMg)0.5W3O12, and Al0.5Sc1.5W3O12 negative and zero thermal expansion coefficient ceramics are discussed. Al0.5Sc1.5W3O12 is demonstrated to be a relatively simple oxide to fabricate in large quantity and is shown to exhibit single phase up to 1300 °C in air and inert N2 environments. The negative and zero CTE behavior was confirmed with dilatometry. Thermal conductivity and heat capacity were reported for the first time for HfMgW3O12 and Al0.5Sc1.5W3O12 and thermal conductivity was found to be very low (~0.5 W/mK). Grüneisen parameter is also estimated. Methods for integration of Al0.5Sc1.5W3O12 with other materials was examined and embedding 50 vol% of the ceramic powder in flexible epoxy was demonstrated with a commercial vendor.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- NA0003525
- OSTI ID:
- 1890063
- Report Number(s):
- SAND2022-13382; 710358
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase transition, crystal water and low thermal expansion behavior of Al{sub 2−2x}(ZrMg){sub x}W{sub 3}O{sub 12}·n(H{sub 2}O)
Enhanced negative thermal expansion in Lu{sub 2}W{sub 3}O{sub 12}
Negative thermal expansion in ZrW{sub 2}O{sub 8} and HfW{sub 2}O{sub 8}
Journal Article
·
Wed Oct 15 00:00:00 EDT 2014
· Journal of Solid State Chemistry
·
OSTI ID:22443405
Enhanced negative thermal expansion in Lu{sub 2}W{sub 3}O{sub 12}
Journal Article
·
Thu Oct 01 00:00:00 EDT 1998
· Journal of Solid State Chemistry
·
OSTI ID:305398
Negative thermal expansion in ZrW{sub 2}O{sub 8} and HfW{sub 2}O{sub 8}
Journal Article
·
Sat Nov 30 23:00:00 EST 1996
· Chemistry of Materials
·
OSTI ID:518368