The structural, magnetic and Moessbauer spectral properties of the magnetocaloric Mn1.1Fe0.9P1-xGex compds., with 0.19 < x < 0.26, were measured between 4.2 and 295 K. The 295 K unit-cell vol. increases from x = 0.19 to 0.22 and is substantially smaller in the ferromagnetic Mn1.1Fe0.9P0.74Ge0.26. The temp. dependence of the magnetization reveals a ferromagnetic to paramagnetic transition with a Curie temp. between ∼250 and 330 K and hysteresis width of 10 to 4 K, for 0.19 < x < 0.25. The compn. Mn1.1Fe0.9P0.78Ge0.22 shows the largest isothermal entropy change of ∼10 J/(kgKT) at 290 K. The Moessbauer spectra were analyzed with a binomial distribution of hyperfine fields correlated with a change in isomer shift and quadrupole shift, a distribution that results from the distribution of phosphorus and germanium among the near neighbors of the iron. The coexistence of paramagnetic and magnetically ordered phases in ranges of temp. of up to 50 K around the Curie temp. is obsd. in the Mossbauer spectra and is assocd. with the 1st-order character of the ferromagnetic to paramagnetic transition. The temp. dependence of the weighted av. hyperfine field is well fitted within the magnetostrictive model of Bean and Rodbell. Good fits of the Mossbauer spectra could only be achieved by introducing a difference between the isomer shifts in the paramagnetic and ferromagnetic phases, a difference that is related to the magnetostriction and electronic structure change. [on SciFinder(R)]