@article{e089a7695a07429d81076202eadba798,
title = "Effect of transition-metal-ion doping on high temperature thermal expansion of 3:2 mullite-An in situ, high temperature, synchrotron diffraction study",
abstract = "The effect of Ti4+, Cr3+ or Ga3+ doping on thermal expansion of 3:2 mullite was examined from 20 °C to 1400 °C by high temperature XRD using synchrotron radiation. The room temperature mullite lattice expanded with metal-ion incorporation and the change in the b-axis was larger than that along the a-axis (Δb > Δa) for all ion types. Upon heating, the largest elongation was along the b-axis (Δb/bRT) and was similar to that in the pure mullite (∼0.5%). Least expansion was observed along the a-axis (0.28% ≤ Δa/aRT ≤ 0.41%). The thermal expansion of mullite was not constant in the temperature range from 20 °C to 1400 °C, and had a linear dependence on temperature (α(T) = A0 + A1ΔT). The αmean values increased with temperature (20 °C ≤ T ≤ 1000 °C), but were always within 3.0-6.7. Cr3+ and Ga3+ doping decreased the anisotropy in mullite lattice expansion, however, Ti4+ doping showed a sharp increase. Trends associated with type and the quantity of dopant are discussed.",
keywords = "Mullite, Thermal expansion, Transition metal-ion dopants",
author = "P. Sarin and W. Yoon and Haggerty, {R. P.} and C. Chiritescu and Bhorkar, {N. C.} and Kriven, {W. M.}",
note = "Funding Information: Initial discussions with Dr. Hartmut Schneider are gratefully acknowledged. This work was supported by the Air Force Office of Scientific Research, USAF. Yoon was supported under AFOSR Grant no. F49620-03-1-0082; Bhorkar was supported under AFOSR MEANS Grant no. F 49620-01-0500; Chiritescu was supported by AFOSR STTR Grant no. F49620-02-C-0016 (Subcontract AF-STTR 01-NA-240). Sarin was supported by funds from the National Science Foundation (DMR 02-11139). Use of the facilities in the Center for Microanalysis of Materials, University of Illinois, which is partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439 and the APS, Argonne National Laboratory is supported by the US DOE, BES Materials Sciences, under Contract no: W-31-109-ENG-38 are gratefully acknowledged. The authors would also like to sincerely thank the authors of the book “Mullite” 2 as it provided an excellent resource on the current understanding of this material system. ",
year = "2008",
doi = "10.1016/j.jeurceramsoc.2007.03.002",
language = "English (US)",
volume = "28",
pages = "353--365",
journal = "Journal of the European Ceramic Society",
issn = "0955-2219",
publisher = "Elsevier B.V.",
number = "2",
}