Somebody already mentioned Alek http://tubedevices.com/alek/pwl/pwl_e.htm Somewhere from his vast web archives I dag out a paper describing the first polish nixie LC-1. Can't recall the exact link though. And, this article is in polish ;) Shortly: material used for the cathodes was steel, anode was made from NiFeAl alloy. The gas mixture: 33T neon, 40mT argon. They tried lower pressures but got excessive sputtering. The argon addition was to lower the striking voltage. There is more useful data there too.
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