  Considering a generalised action for Einstein Maxwell theory in four
dimensions coupled to scalar and pseudo-scalar fields, the thermodynamic
properties of asymptotically flat black holes solutions in such a background
are investigated. Bekenstein-Hawking area-entropy law is verified for these
class of black holes. From the property of specific heat, it is shown that such
black holes can be stable for certain choice of the parameters like charge,
mass and the scalar vacuum expectation value. The possibility of a black hole
phase transition is discussed in this context.
