Dear all, I am trying to synthesis a compound as given the paper below. Can someone help me of how to calculate the stoichiometric ratio and amount of each compound (i.e. Nd pieces, As, Fe, Fe2O3, FeF3 powders) required to prepare the same compound as in that paper. Especially I don’t know the balanced equation. Preparation of superconducting compound is given in the following paper: Doi: 10.1209/0295-5075/82/57002 The superconducting compound is Nd[O0.89F0.11]FeAs. It is mentioned in that paper as follows: Nd pieces, As, Fe, Fe2O3,FeF3 powders (the purities of all starting chemicals are better than 99.99%) were mixed together according to the nominal stoichiometric ratio of Nd[O0.89F0.11]FeAs, then ground thoroughly and pressed into small pellets. thanks and regards, Rajini.