Effect of Temperature on Structure of La_1−yCe_yFe_11.44Si_1.56 (y = 0.1 and 0.3)

Abstract

This study presents results on crystal structure and phase transition in La_1−yCe_yFe_11.44Si_1.56 (y = 0.1 and 0.3) compounds. All the samples were prepared by using arc-melting method in argon atmosphere. The effect of temperature was studied by X-ray diffraction method. As shown, the compounds possess clear NaZn₁₃-type cubic phase with ferromagnetic spin arrangement of Fe atoms. There reveals a sudden change of lattice constants at 195 K (y = 0.1) and 175 K (y = 0.3) which corresponds to type 1 phase transition.

Fig. 2 Variation of peak (422) maxima according to T for (a) y = 0.1 and (b) y = 0.3.