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In this research, we report on the synthesis and characterization of$La_{0.67}Ca_{0.33}MnO_3$ (LCMO), $La_{0.67}Ba_{0.33}MnO_3$ (LBMO), and$La_{0.67}Sr_{0.33}MnO_3$ (LSMO) perovskites. Precursor powders for theperovskite samples were prepared using ball mailing technique. The resultingpowder was pressed into disks which were subsequently sintered at 1000 C for2h. The structural characteristics of the prepared samples were investigatedusing X-ray diffraction (XRD) and scanning electron microscope (SEM), and themagnetic properties were investigated using vibrating sample magnetometry(VSM). XRD pattern of LCMO sample revealed a pure perovskite phase with Pnmaspace group, while the pattern of LSMO sample revealed a pure perovskite withR3c$^-$ space group. XRD pattern of LBMO sample, however, demonstrated thepresence of a major perovskite phase with R3c$^-$ symmetry, together with asecondary $BaMnO_3$ phase. This secondary phase disappeared upon sintering LBMOat a higher temperature of 1100 C. Isothermal magnetic measurements andthermomagnetic curves revealed that LCMO was paramagnetic at room temperature.However, LSMO exhibited soft ferromagnetic behavior at room temperature, withTc = 380 K and Ms = 50.9 emu/g. Also, LBMO sample sintered at 1000 C exhibitedsoft ferromagnetic behavior at room temperature, with Curie temperature Tc =343 K and a rather low saturation magnetization of Ms = 30.7 emu/g. The highersintering temperature of LBMO compound resulted in a significant increase ofthe saturation magnetization to 50.8 emu/g for the sample sintered at 1100 C.

Structural and magnetic properties of $La_{0.67}Ca_{0.33}MnO_3$ (D = Ca, Sr, Ba) manganites prepared by Ball milling