Why literature shows La being substituted in place of a divalent instead of a trivalent metal atom in hexa-ferrite?

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Frank T. Edelmann

Dear Muhammad Zarrar Khan, please find below a very recent article related to this question which is available on RG. Unfortunately I don't have access to the full text.

Article Implementation of La3+ ion substituted M- type strontium hex...

Hi Øystein Slagtern Fjellvåg, this is actually an important point. The ionic radii of Sr2+ and La3+ are large and quite similar (113 pm vs. 115 pm), while that of Fe is significantly smaller (Fe2+: 0.83 pm; Fe3+: 0.647 pm).

Muhammad Zarrar Khan

Øystein Slagtern Fjellvåg I see.I do understand the concept that Sr is being substituted by La/Nd bcz their ionic radii are similar, but how can we justify the valence state of the overall compound if we are substituting divalent atom by a trivalent according to the stoichiometric ration of Sr:La to be 1-x:x ?

***One thing i learned is that divalent should only be replaced by divalent and trivalent should only be replaced by trivalent?

Frank T. Edelmann ??

oh i see,,, so some of the Fe (same amount as La ) will be converting to Fe+2 to compensate for the overall charge neutrality ......

I didnt know that ......

Øystein Slagtern Fjellvåg Øystein Slagtern Fjellvåg thank you .. its more clearer to me now :)

Behzad Abasht thank you brother

plz share some research papers showing the analysis of substitutions in ferrites via Mossbauer spectroscopy ............ how would we be determining the location of the substitution using this tehnique

I am supposed to be at Tsinghua , they have this technique as well.

Although my primary project is to study the microwave absorption properties of ferrite/conductive polymers , it would help if i can the the knowledge related to the substitutions as well.