Abstract
A simple, rapid, and inexpensive heating-wire technique is used for physical observations at high temperatures. The upper limit is 2000 K in air with platinum-iridium or platinum-rhodium wires and 2700 K with iridium; temperatures up to 3600 K can be achieved under an inert atmosphere with tungsten wires. Raman spectroscopy measurements made up to 1900 K by this technique suggest that the high-temperature harmonic vibrational behavior of corundum (α-Al2O3) results from the cancellation of anharmonic effects. Powder x-ray diffraction experiments with synchrotron radiation show that perovskite (CaTiO3) changes from orthorhombic symmetry to cubic between 1330 and 1530 K, with an intermediate tetragonal phase likely, consistent with λ-type transitions recorded by recent calorimetric measurements. Finally, observations of CaAl2Si2O8 polymorphism has shown the existence of a new metastable phase.
Bibliography
Richet, P., Gillet, P., Pierre, A., Bouhifd, M. A., Daniel, I., & Fiquet, G. (1993). Raman spectroscopy, x-ray diffraction, and phase relationship determinations with a versatile heating cell for measurements up to 3600 K (or 2700 K in air). Journal of Applied Physics, 74(9), 5451â5456.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 8:39 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 2, 2024, 7:13 a.m.) |
Indexed | 1 year, 6 months ago (Feb. 10, 2024, 11:07 a.m.) |
Issued | 31 years, 9 months ago (Nov. 1, 1993) |
Published | 31 years, 9 months ago (Nov. 1, 1993) |
Published Print | 31 years, 9 months ago (Nov. 1, 1993) |
@article{Richet_1993, title={Raman spectroscopy, x-ray diffraction, and phase relationship determinations with a versatile heating cell for measurements up to 3600 K (or 2700 K in air)}, volume={74}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.354256}, DOI={10.1063/1.354256}, number={9}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Richet, Pascal and Gillet, Philippe and Pierre, Alain and Bouhifd, M. Ali and Daniel, Isabelle and Fiquet, Guillaume}, year={1993}, month=nov, pages={5451–5456} }