BeO / LiH ?

Say you want a nonconductive high melting point, high specific heat, high thermal conductivity material, and aren't particularly worried
about cost. LiH has a high specific heat and decent heat capacity. BeO has a better thermal conductivity by a factor of 20 ish, but worse specific heat by a factor of 3.5 ish. Is there a way to combine them to get some of both? Are they even stable together at high temperature?
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BDH wrote:

Bear in mind that BeO is incredibly toxic, especially by the inhalation route.
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BDH wrote:

charcoal pocofoam?
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Seems nifty. Usually porous things have bad thermal conductivity. It would react with LiH, but maybe something else would work.
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Also unfortunately, voltages too high for graphite are involved.
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BDH wrote:

Vulcanise?
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