Thermal expansion coefficient of Ln۰.۶Sr۰.۴Co۰.۲M۰.۸O۳−δ (Ln=La,Nd,Sm and M=Fe,Ni,Mn) perovskite oxide

In this study, Thermal expansion coefficient (TEC) variation of Ln۰.۶Sr۰.۴Co۰.۲M۰.۸O۳−δ (Ln=La,Nd,Sm and M= Fe,Ni,Mn) perovskite oxide have been evalouated. Different compounds have been prepared and thermal expansion coefficient have been meseaured in different temperature by means of dilatometer analysis. Structural parameters of compounds have been  determined by X-ray diffraction and Field Emission Scanning Electron Microscopy (FE-SEM) has been used for the morphological study. Experimental results have shown TEC decreases favorably with substitution of  Nd۳+ and Mn۳+ ions in the lattice