Question: assign float not function

my problem is probably that maple assigns everywhere possible the whole expression (cause its analytical)

How do i get it to calculate a float and save it as such?

e.g.

interfaceenergy:=5.

sig:=200.*10^6

Temp:=fsolve(xi_M[Temp,sig,interfaceenergy)=0.5,T, T=100..400])

whattype(Temp) ---> function

...this is part of a nested loop (2) so after some time of calculating maple says

"Error unable to store.... and then the huge expression where function is inserted into function" maybe when it only remembers the numbers it will work...

I am happy for every kind of help.

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