“…Mutual separation characteristics of rare earth elements by a dry process so called chemical vapor transport reaction have been investigated intensively from several aspects, such as different vapor complexes KLnCl 4 [2,3,10,13,14,[20][21][22] or LnAl n Cl 3n+3 [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], different raw materials like as rare earth chloride mixtures, oxide mixtures, concentrates of ore and the scraps containing of rare earth elements. Moreover, the temperature gradients [4,22] and reaction steps for separation has been investigated too, that is the conventional chemical vapor transport (CVT) reaction [1][2][3][4][5][6][7][8][9][10][12][13][14] or stepwise selective chlorination-chemical vapor transport (SC-CVT) reaction [11,[15][16][17][18][19]…”