Stability, electronic band structure, magnetic, optical and thermoelectric properties of CoXCrZ (X = Fe, Mn and Z = Al, Si) and FeMnCrSb quaternary Heusler

•The magnetization of these quaternary Heusler comes mainly from the 3d electrons of the Fe, Co, Mn and Cr atoms.•The increase in temperature for the spin up case reduces the figure of merit and increases the total electronic conductivity in these quaternary Heusler.•The resistivity of studied quaternary alloys is little sensitive to the temperature.