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Profile analysis of powder diffraction lines was used to determine the changes of the lattice parameters versus temperature in KMnF3 doped by Li+, Na+ and Rb+ cations. The temperatures of the structural phase transitions (SPT), the type of distortion and the phase diagram in the concentration rangex<0.15were determined from the splitting of some cubic lines as 211, 220 and 400. The discussion of the order of the SPT as a function of concentration is presented.
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