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Measurements of the Hall effect, thermoelectric power, magneticsusceptibility and upper and lower critical fields were performed on singlecrystals of SrFe(2-x)Ni(x)As2, an FeAs-based superconducting system thatexhibits a reduced superconducting transition temperature Tc in comparison tomost other iron-pnictide superconductors. Studies of the Hall andthermoelectric responses indicate that Ni substitution in this system resultsin a dominant electron-like response, consistent with electron doping in othersimilar systems but with a weaker change in the Hall coefficient and a moregradual change in the thermoelectric response with Ni concentration. Foroptimally doped samples with full superconducting volume fraction, the lowerand upper critical fields were determined to be Hc1(1.8 K)= 0.08T and Hc2(0)=25T, respectively, with lower-Tc samples showing reduced values and indicationsof inhomogeneous superconductivity. Comparable to other higher-Tc FeAs-basedmaterials, the temperature dependence of the upper critical field, dHc2/dT, islinear over a wide temperature range, and the large values of Hc2(0) greatlyexceed conventional estimates of paramagnetic and orbital limits.

Effective carrier type and field-dependence of the reduced-Tc superconducting state in SrFe(2-x)Ni(x)As2