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The existing controversy about the room temperature structure of multiferroicPb(Fe_1/2Nb_1/2)O_3 is settled using synchrotron powder x-ray diffraction data.Results of Rietveld refinements in the temperature range 300 to 12K reveal thatthe structure remains monoclinic in the Cm space group down to 12K, but thelattice parameters show anomalies at the magnetic transition temperature (T_N)due to spin lattice coupling. The lattice volume exhibits negative thermalexpansion behaviour, with Alpha = - 4.64 x 10^-6 K^-1, below T_N.

Evidence for monoclinic crystal structure and negative thermal expansion below magnetic transition temperature in Pb(Fe1∕2Nb1∕2)O3