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We show that symmetry of the crystal lattice of exchange magnets (containingonly 3d magneto-active elements) does not change at the Curie point; only themagnetic symmetry of the crystal is decreasing in the transition point. In thenon-exchange magnets (containing only rare-earth magneto-active elements), onthe contrary, both the magnetic and crystal-chemical symmetry decrease at theCurie point. There is isotropic magnetic phase in exchange magnets; and theirmagnetic symmetry is described by color groups of magnetic symmetry of P-type.Non-exchange magnets do not have isotropic phase; their symmetry is describedby color groups of magnetic symmetry of Q-type.

On conservation of the of crystal lattice symmetry in transition at Curie point in exchange magnets