I need the melting point of silver at low pressures. I tried to calcine the silver wire under 10^{-3} Torr vacuum. Following the logic that the melting point in vacuum wouldn't differ too much relative to 961.8 °C at 1 bar, I did it at 935 °C. Unfortunately, silver melted.
So, does anybody know low-pressure dependence of melting point of silver? Concretely, what is the melting point of silver at p = 10^{-3} Torr? I found data for high pressures only, and I am not sure if this data can be simply extrapolate to low pressures.
In this pressure range, the influence of pressure on melting point should be extremely minimal. For low pressure, you are more likely to see a change in the solid-vapor equilibrium. If you need the exact change in melting temperature (we are not talking as much as 30 degrees here), you may want to calculate the change in phase free energy due to the volumetric change being under different applied pressures, but again, I would expect this to be very little.
What value do you get by extrapolation?
Extrapolation gives me 960.8 °C. Your answer gives me an impression that the thermometer of my oven is not good calibrated. I will check it out.
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