bifurcation temperature and irreversibility temperature for the ZFC and FC curve are the same things but blocking and freezing temperature could be different.
Blocking Temperature:
The blocking temperature Tb is defined as the maximum temperature in the ZFC curve.
Blocking temperature obtained from ZFC curve is median blocking temperature (the FWHM of the size distribution plays a role too)
Freezing Temperature:
The peak in the low field ac susceptibility curve is the freezing temperature Tg (also called the glass temperature) in the susceptibility of magnetic spin glasses.
Bifurcation temperature or Irreversibility temperature:
The Irreversibility temperature TIrr is the temperature where the ZFC and FC curves separate from each other. TIrr is always larger than Tb and is related to the blocking of nanoparticle (NPs) having maximum size in the NPs distribution.
You can follow discussions on the following question for further detail.
https://www.researchgate.net/post/What_is_the_difference_between_Bifurcation_temperature_and_blocking_temperature_What_is_the_exact_definition_of_Bifurcation_temperature2
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