The specific heat of MnAlGe, MnGaGe and MnZnSb are measured. The value
s of the electronic specific heat coefficient are 8.9 mJ/mol K-2 for M
nAlGe, 8.7 mJ/mol K-2 for MnGaGe and 11.3 mJ/mol K-2 for MnZnSb. The m
agnetic anomalies of the specific heat are discussed in connection wit
h the pressure dependence of T-C and magnetic thermal expansion anomal
ies.