[pfdietz]

Silicon carbide would work up to 1800 C. Various refractory oxide ceramics could also work.

This whole approach needs direct sunlight, so it's not great for a place, like Europe, where it's often cloudy. It would be better for deserts, like in Chile, Namibia, or maybe the Arabian Peninsula.

[fl7305]

It's not great for a production site. But for engineering tests, you can do a lot of stuff with no sun, and the occasional clear skies are used for sun testing.