I can't give the specifics for LQMT's formulations of BMG, but generally the thermal conductivity for BMG is lower than crystalline metals (see, https://en.wikipedia.org/wiki/Amorphous_metal). So, it makes a better insulator than regular/crystalline metals.
I believe that the specific heat capacity of BMG is generally greater than that of crystalline metals (see, http://www.tms.org/pubs/journals/JOM/0007/Busch-0007.html). Meaning that given the same mass of BMG and crystalline metal, the temperature of BMG will rise less than that of crystalline metal when they absorb the same amount of heat. However, when BMG absorbs too much heat at high enough temperature it reverts to a crystalline metal.
In short, BMGs make better thermal insulators than crystalline metals. I cannot tell whether BMGs make better heat sinks than crystalline metals because while they have a higher specific heat capacity (good for a heat sink), they also resist absorbing heat due to their lower thermal conductivity (bad for a heat sink). An ideal heat sink would have high thermal conductivity and high specific heat capacity.
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