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The martensitic and magnetic transformations in bulk Ni 50Mn 50 - zSn z (z = 11.5-15.0)Heusler alloys were investigated by differential scanning calorimetry measurement and the vibrating sample magnetometry technique and are described in correlation to the microstructure. It is established that increasing the Sn-content in this series leads to change the alloy microstructure very sensitively from a martensite phase (with distinct martensite strips) over z = 11.5-15.0 to the austenite phase as early as z = 15.0 at room temperature. The structural transition temperature has decreased from 411 K for z = 11.5 at% of the Sn content to a value as low as 196 K for z = 15.0 at% Sn content. An inverse magnetocaloric effect (MCE) has been observed with aΔSM value 2.5 Jkg- 1 K- 1 at 273 K for z = 13.5 at % Sn-content.