Abstract
In the temperature range from –180 to +50 °C, at frequencies of the order of several hertz, the internal friction Q−1 and the shear modulus G in CoO crystals, nominally pure and with Ni additives, were studied. The temperature dependence of internal friction has a complex form. A Q−1 maximum was found near ∼160 °C, which has a dislocation nature, and a Q−1 peak near ∼18 °C, which is associated with the kinetics of the phase transformation at the Neel temperature. The doping of CoO crystals with Ni impurity leads to the appearance of one more Q−1 relaxation maximum at ∼60 °C. The occurrence of this maximum is associated with the reorientation of the elastic Co3+– Ni1+ dipole under the external mechanical stress.
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