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Аннотация:Magnetic measurements were performed on Cu2V2O7. Above similar to 70K paramagnetic susceptibility obeys the Curie-Weiss law. Value of effective magnetic moment mu(eff) = 1.9 mu(B) corresponds to that of Cu2+. The Weiss temperature Theta = - 66 K is negative and indicates an antiferromagnetic exchange interaction between Cu2+ ions. At T-c = 35 K a spontaneous magnetization arises due to the transition from paramagnetic state into either ferrimagnetic or canted antiferromagnetic state. (C) 2000 Published by Elsevier Science B.V. All rights reserved.