Display MoreSo, let's consider candidate lithium "blankets". One, Lithium aluminum silicate (aka spodumene, or Corning "Visions ware"). Melting point around 1420 C. But of course the composition will also subject oxygen, silicon and aluminum to high neutron flux.
How about Li2C2 aka lithium carbide? Unfortunately melting point 550 C.
Perhaps lithium carbonate? MP 723 C
How about pure lithium metal? MP 357 C.
Wouldn't the lithium vapor interfere with the hydrogen fusion reaction?