• Padmakumar K

Detailed variable temperature Mossbauer, Infrared, measurements and variable temperature magnetic susceptibility were carried out on K2Pb [Fe(NO2)6] to investigate the electronic structure and correlate it to the observed unusual magnetic hyperfine interaction in this system. All these results are then further extended to the other systems where lead has been substituted with strontium, zinc and calcium, because of their structural similarity. This was further confirmed by detailed variable temperature Mossbauer spectral measurements on the above-mentioned systems. The transition temperature in all these systems was found to be 45 K. These results exactly match with those of K2Ba[Fe(NO2)6] reported earlier. All these results indicate the existence of superparamagnetic relaxation in these types of complexes, generated as a result of nano size dimension, which is evident from the synthetic procedure adopted

Hexanitroferrates, superparamagnetism,

"Superparamagnetism In Hexanitroferrates, K2M[Fe(NO2)6] Where M is Pb, Sr, Zn, Ca", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 9, page no.e207-e212, September-2021, Available :http://www.jetir.org/papers/JETIR2109422.pdf

"Superparamagnetism In Hexanitroferrates, K2M[Fe(NO2)6] Where M is Pb, Sr, Zn, Ca", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 9, page no. ppe207-e212, September-2021, Available at : http://www.jetir.org/papers/JETIR2109422.pdf