- Conference date: 28 Jun − 2 Jul 1993
- Location: Colorado Springs, Colorado (USA)
Time dependent shock temperatures were measured for stainless steel (SS) films in contact with transparent anvils. The anvil/window material was the same as the driver material so that there would be symmetric heat flow from the sample. Inferred Hugoniot temperatures, T h , of 5800–7500 K at 232–321 GPa are consistent with previous measurements in SS. Temperatures at the film‐anvil interface (T i ), which are more directly measured than T h , indicate that T i did not decrease measurably during the approximately 250 ns that the shock wave was in Al 2 O 3 or LiF anvils. Thus an upper bound is obtained for the thermal diffusivity of Al 2 O 3 at the metal/anvil interface at 230 GPa and 6000K of κ≤0.00096 cm 2/s. This is a factor of 17 lower than previously calculated values, resulting in a decrease of the inferred T h by 730 k. The observed shock temperatures are combined with temperatures calculated from measured Hugoniots and are used to calculate thermal conductivities of Al 2 O 3. Also we note that since there was no measurable intensity decrease during the time when the shock wave propagated through the window, we infer from this that Al 2 O 3 remained transparent while in the shocked state. Thus sapphire is a good window material to at least 250 GPa for shock temperature measurements for metals.
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