1. There are work focused on Dielectric and Magnetic Properties of La Substituted CoFe2O4 Nanoparticles and the effect of lanthanum (La3+) substitution. Although the saturation magnetization decreases with increasing La3+ ion concentrations , it would be useful to include the comparison with other research for example: Vadivel M., Ramesh Babu R., Selvakumar P., Arivanandhan M., Ramamurthi K. (2017) Structural, Dielectric and Magnetic Properties of La Substituted CoFe2O4 Nanoparticles. In: Ebenezar J. (eds) Recent Trends in Materials Science and Applications. Springer Proceedings in Physics, vol 189. Springer, Cham. and Routray, K.L., Saha, S. & Behera, D. Rare-earth (La3+) substitution induced changes in the structural, dielectric and magnetic properties of nano-CoFe2O4 for high-frequency and magneto-recording devices. Appl. Phys. A 125, 328 (2019). https://doi.org/10.1007/s00339-019-2615-8 .Would be interesting to explain why the saturation magnetization decrease is different. The following articles can be cited.
2. The motivation of this study is not clear, why La+ is used to substitute Fe atom, and what is the drawback of CoFe2O4 limiting its applications.
3. Revise the introduction with the help of latest references on CoFe2O4 giving importance to the application part.
4. In figure 1, only X=0.09 shows La related peaks, other concentrations don't show any peaks, it is hard to claim La successfully substituted Fe atoms. What is the effect of peak intensity on structural parameters?
5. Why Ms decreases when La substituted Fe atoms? Also, magnetic study is vaguely discussed.
6. The claim that magnetic properties being hard ferrite by substitutions by La3+ ions is not supported by the magnetic measurement. Discuss
7. What is the mechanism of La doping in cationic distribution?

Accepted.