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 1¹y Ce y Fe 11.44 Si 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 NaZn 13 -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.

Recent Progress in Nanostructured Functional Materials and Their Applications II

“…Magnetic measurements of narrow-gap semiconductor FeSb 2 under pressure is reported in the second paper, 169) in which pressure effects on magnetic susceptibility and energy gap of FeSb 2 are investigated at temperatures between 50 and 300 K under pressure up to 13 kbar. The third paper 170) investigates effect of temperature on the structure of La 1¹y Ce y Fe 11.44 Si 1.56 at the temperatures between 100 and 295 K using the X-ray diffraction technique. Figure 3 shows dependence of lattice constants on the temperature of La 1¹y Ce y Fe 11.44 Si 1.56 , which suggests that first order phase transitions occur and Ce concentration affects the transition temperature.…”