The research article is the analysis of wave propagation in an initially stressed micropolar fractional-order derivative thermoelastic diffusion medium with voids. The governing equations in the context of generalized fractional-order derivative thermo-elasticity are formulated and the velocity equations are obtained. The plane wave solution of these equations indicates the existence of six plane waves, namely coupled longitudinal displacement ( cL ), coupled thermal ( cT ), coupled mass

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... on ( c M D ), coupled longitudinal void volume fraction ( cV ), coupled transverse displacement ( c T D ), and coupled transverse micro-rotational ( c T M ) waves. The sets of coupled waves ( cL ), ( cT ), ( c M D ) and ( cV ) are found to be dispersive, attenuating and influenced by the presence of thermal, diffusion and voids parameters in the medium. The speeds of coupled transverse displacement ( c T D ), and coupled transverse micro-rotational ( c T M ) waves are not affected by thermal, diffusion and void parameters. The speeds of the plane waves, , , , c L c T c M D and cV are computed for a particular material and plotted against the thermal parameter, frequency, initial stress, diffusion and void parameters. Plane-wave. ; V wave speed, m/s; t time, sec; c c c J J J ad ad