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The time-dependent perturbed angular correlation (TDPAC) technique was used to measure the electric field gradient (EFG) as a function of pressure for the compounds InBi, In₂Bi and In₅Bi₃ and as a function of temperature for In₅Bi₃ ¹¹¹Cd as probe on the indium sites. It was possible to identify the phase transition induced by pressure in the compound In₂Bi as a transformation to the structure of the compound In₅Bi₃ with defects. Estimates were made of the volume and the explicit temperature dependences of the EFG for the compounds In₂Bi and In₅Bi₃. The high values of the volume dependence of the EFG obtained for In₂Bi is comparable to the known values for pure metals. The importance of anharmonic effects in the EFG shows up for In₅Bi₃.